Hotel Whiskey Aviation first offered ER Tanks for the RV-4 in 2002.  Now, we have units flying in the RV-4, RV-6, RV-7, RV-8, RV-9, and RV-10!   Extended Range Fuel Tanks - "ER" Tanks - are designed and manufactured by Hotel Whiskey Aviation, LLC.   ER Tanks bring high quality, low cost solutions to the RV community for builders and pilots wanting extended range and improved operating safety margins for their RVs.   The legendary RV is well known for its high performance, low cost, and great looks! Builders often choose the RV because of a desire to use the aircraft for extensive travel around the country, and it's a great airplane for that mission. Extended Range Fuel Tanks promote this mission by reducing the number of required fuel stops and increasing the time in the air. Pilots are able to change their flight planning logistics for long trips and improve the "net performance" of the airplane.    

Hotel Whiskey Aviation first offered ER Tanks for the RV-4 in 2002.  Now, we have units flying in the RV-4, RV-6, RV-7, RV-8, RV-9, and RV-10!

 

Extended Range Fuel Tanks - "ER" Tanks - are designed and manufactured by Hotel Whiskey Aviation, LLC.   ER Tanks bring high quality, low cost solutions to the RV community for builders and pilots wanting extended range and improved operating safety margins for their RVs.

 

The legendary RV is well known for its high performance, low cost, and great looks! Builders often choose the RV because of a desire to use the aircraft for extensive travel around the country, and it's a great airplane for that mission. Extended Range Fuel Tanks promote this mission by reducing the number of required fuel stops and increasing the time in the air. Pilots are able to change their flight planning logistics for long trips and improve the "net performance" of the airplane.

 

 

 
 

benefits of "er" Tanks

 

go Faster - Arrive sooner

Sometimes, the slower plane gets there first! A fuel stop significantly increases the "Chock-to-Chock" time. Longer range capability can shorten your total time en route by eliminating a fuel stop. 

This improves the overall mission performance of the aircraft.

Safety 

Increases "personal" VFR or IFR minimum fuel reserves: Extra fuel on board allows pushing up VFR minimums to 45 minutes or IFR minimums to one hour and still have more fuel to fly farther.

added value

By improving the mission capabilities of the airplane, ER Tanks (like a high quality IFR panel) increase your airplane's market value.

economy

Buy fuel at locations offering better prices, or skip fuel where it lacks competitive pricing.

time is money

Eliminate the need for refueling on medium range hops by carrying enough fuel to go out and back. If you're like us, you always fill the tanks before putting the aircraft back in the hangar. Eliminating the need to refuel on medium range trips, while maintaining sufficient safety margins, saves you 15-30 minutes on every trip.

 

 

rv-4 equipped with "er" Tanks

 

Van's RV-4 lends itself very well to additional fuel for owners who use their aircraft for cross country operations. Hotel Whiskey Aviation (HWA) owns two RV-4's and found them lacking, due to limited fuel capacity, in cross country capability.  HWA designed ER Tanks to solve this problem. 

It wasn't long before others wanted ER Tanks for their aircraft, and that's how it all got started!

 

Pricing:

ER Tanks for the RV-4 are $1650.00 + Crating, Shipping, and Insurance.  This typically adds $300.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.

 

Specifications:

  • Weight - Total System Weight = 10 pounds

  • Capacity = 8.2 Gallons (4.1 per side)

  • Method of Transfer = Gravity Feed

  • Wing Tips we can accommodate - Van's W715, W715-1, and Van's "Old School" Tips (These were Van's original "flat top" tips sold with the standard RV-4 and RV-6 kits)

  • Approximate Location of ER TANKS = 73.00" Aft of Datum

 

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only component not supplied is a dollop of Pro-Seal. Each tank holds approximately 4.1 gallons, adding just over 8 gallons to the total capacity of the RV-4.

ER Tanks, for the RV-4, utilize a "Gravity Feed System".  This is Hotel Whiskey's preferred system because it is light weight, simple, has fewer moving parts (more reliable), and is less expensive to purchase and maintain.  The "Gravity Feed" ER Tank System uses no pumps and requires no on-board electrical power or guages.

Fuel flow is controlled by TRANSFER VALVES.  When the transfer valves are opened, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually)  There are other issues to consider, but when a system is properly installed, gravity will cause the fuel to transfer from the ER Tanks to the MAIN tanks.

If we were to feed the engine directly from the ER Tanks, which we don't, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we utiize the sump and fuel indicators from the mains.  The Installation Manaul goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter" as fuel is transferred, and require constant trimming.


Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is approximately 10 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

 

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

 

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-4.

 

Real World Weight & Balance Example:

NOTE:  The following is for estimation only and is not to be used for flight planning.  The purpose of this data is to give potential customers an idea of how ER Tanks affect the C.G. in an RV-4.  Unlike production aircraft, Experimental aircraft can vary significantly from each other.  Weight & Balance (including C.G.) calculations must be performed utilizing data collected from THAT aircraft.

Based on an actual RV-4 flying with ER Tanks, we looked at how the following fuel loads affect the Center of Gravity.  We calculated the following fuel conditions:

Main Tanks Full and ER Tanks Empty
Main Tanks Empty and ER Tanks Empty (theoretical)
Main Tanks Full and ER Tanks Full
Main Tanks Empty and ER Tanks Empty

For the RV-4 above, varying fuel loads caused the C.G. to shift between XX.XX" and XX.XX", or a total change of XX.XX"

RV-4 DATUM................................60" forward of the wing leading edge

RV-4 LIMITS
Design C.G. Range (%)...................68.7"- 77.4" aft of datum.

RV-4 ARMS
Main Fuel .....................................70.00" aft of datum
ER Tanks & Fuel ............................73.00" aft of datum
Pilot ............................................82.50" aft of datum
Passenger ...................................107.00" aft of datum
Rear Baggage...............................130.00" aft of datum

 

Aerobatics:

Aerobatics are not authorized when ER Tanks contain ANY amount of fuel.  Owner/Operator must stay withing Van's recommendations for aerobatic flight.  We have NOT conducted Spin Testing with ER Tanks, as a result, we DO NOT recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-4, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.

Wing Tips: 
 
Two seat RV's have been produced with 3 different types of wing tips. We need to know which ones you're installing on your aircraft. I'll do my best with verbal descriptions, but I've attached an image to help clarify the issue.

 

The 3 types of wing tips most common to the RV-4 are:

  1. "Old School" - These are the original tips provided in the original RV-4 kits. The "old school" tips are flat on top, essentially extending the upper wing skin to the outer edge of the wing tip. The bottom surface of the fiberglass wing tip curves upward to meet the straight upper surface. The outboard edge of the wing tip runs parallel to the tip rib of the wing.  (The other two styles taper)  There were no factory cut outs for the lights (that had to be done by the builder)

  2. Van's part no: W-715: The bottom of this wing tip is flat and the upper surface curves downward. The tip also gets wider as you move aft along the tip rib. These tips were originally introduced on the RV-7 and give the aircraft a slightly longer wingspan, as well as a "bat wing" appearance. The most distinguishing characteristic is the curved trailing edge as shown in the attached image.

  3. Van's part no: W-715-1:  At first glance this wing tip resembles W-715, but it has a straight trailing edge. It also has a larger cut out area for mounting landing and position lights.

The first step is to compare the upper surface of the tips. If it's flat, it's "old school". If it's not, it's one of the two shear tips. The attached image will show you how to quickly determine which tips you have. If you have any problems, please don't hesitate to contact me. We want to be certain since ER Tanks are not interchangeable with the different wing tip styles.

 

Dimensions:

RV-4 ER Tanks have a critical dimension.  We can build ER Tanks so they fit aircraft "built to plans
" but we prefer to build them to fit YOUR aircraft.  The difference is an easier installation and a perfect fit.  The dimension we'll need is the distance between two nose ribs.  You will be hooking your tape measure to the inside of one lightening hole and measuring to the same location (lightening hole) on another rib.

Which Lightening Hole?

The first lightening hole FORWARD of the main spar.

Between which Nose Ribs?

Measure the distance between the FIRST nose rib OUTBOARD of the main fuel tank (be careful, there are two closely spaced nose ribs here.  Make sure you latch the tape to the one closest to the main fuel tank.) and the OUTERMOST nose rib on the wing. (wing tip nose rib)  Note the measurement and move to the other side of the aircraft.  Once complete, email the left/right dimensions, along with your wing tip type, to CustomerCare@SafeAir1.com.

Is this Difficult?

No, only the wing tips need be removed for this measurement.  Use the widest tape measure you have. It will stay erect at greater distances and make the job a little easier.  A good flashlight or drop light is all you need.  The main fuel tanks can remain in place for this operation, though they will require removal for the installation of your ER Tanks.  With a buddy helping, I would expect the measuring operation to take less than an hour.  Running solo, maybe an hour and a half.

rv-6 equipped with "er" tanks

 

Van's RV-6 lends itself very well to additional fuel for owners who use their aircraft for cross country operations.  Shortly after ER Tanks for the RV-4 hit the market, RV-6 "drivers" were wanting tanks for their "rides".  Of course, HWA stepped up to the plate!

Pricing:

ER Tanks for the RV-6 are $1650.00 + Crating, Shipping, and Insurance.  This typically adds $300.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.

Specifications:

  • Weight - Total System Weight = 10 pounds

  • Capacity = Approximately 8.8 Gallons (~4.4 per side)

  • Method of Transfer = Gravity Feed

  • Wing Tips we can accommodate - Van's W715, W715-1, and Van's "Old School" Tips (These were Van's original "flat top" tips sold with the standard RV-4 and RV-6 kits)

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only component not supplied is a dollop of Pro-Seal. Each tank holds approximately 4.4 gallons, adding just under 9 gallons to the total capacity of the RV-6.

ER Tanks, for the RV-6, utilize a "Gravity Feed System".  This is Hotel Whiskey's preferred system because it is light weight, simple, has fewer moving parts (more reliable), and is less expensive to purchase and maintain.  The "Gravity Feed" ER Tank System uses no pumps and requires no on-board electrical power or guages.

Fuel flow is controlled by TRANSFER VALVES.  When the transfer valves are opened, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually)  There are other issues to consider, but when a system is properly installed, gravity will cause the fuel to transfer from the ER Tanks to the MAIN tanks.

If we were to feed the engine directly from the ER Tanks, which we don't, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we utiize the sump and fuel indicators from the mains.  The Installation Manaul goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter" as fuel is transferred, and require constant trimming.


Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is 10 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

 

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-6.

Real World Weight & Balance Example:

NOTE:  The following is for estimation only and is not to be used for flight planning.  The purpose of this data is to give potential customers an idea of how ER Tanks affect the C.G. in an RV-6.  Unlike production aircraft, Experimental aircraft can vary significantly from each other.  Weight & Balance (including C.G.) calculations must be performed utilizing data collected from THAT aircraft.

Based on an actual RV-6 flying with ER Tanks, we looked at how the following fuel loads affect the Center of Gravity.  We calculated the following fuel conditions:

Main Tanks Full and ER Tanks Empty
Main Tanks Empty and ER Tanks Empty (theoretical)
Main Tanks Full and ER Tanks Full
Main Tanks Empty and ER Tanks Empty

For the RV-6 above, varying fuel loads caused the C.G. to shift between 73.97" and 74.55", or a total C.G. change of 0.58"

RV-6 DATUM..........................60" forward of the wing leading edge

RV-6 LIMITS
Design C.G. Range...................68.7" - 77.4" aft of datum.

RV-6 ARMS
Main Fuel ..............................70.00" aft of datum
ER Tanks & Fuel .....................75.00" aft of datum

Aerobatics:

Aerobatics are NOT authorized when ER Tanks contain ANY amount of fuel.  Owner/Operator must stay withing Van's recommendations for aerobatic flight.  We have NOT conducted Spin Testing with ER Tanks, as a result, we DO NOT recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-6, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea.

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.



Wing Tips: 
 
Two seat RV's have been produced with 3 different types of wing tips. We need to know which ones you're installing on your aircraft. I'll do my best with verbal descriptions, but I've attached an image to help clarify the issue.


The 3 types of wing tips most common to the RV-6 are:

  1. "Old School" - These are the original tips provided in the original RV-4 and RV-6 kits. The "old school" tips are flat on top, essentially extending the upper wing skin to the outer edge of the wing tip. The bottom surface of the fiberglass wing tip curves upward to meet the straight upper surface. The outboard edge of the wing tip runs parallel to the tip rib of the wing.  (The other two styles taper)  There were no factory cut outs for the lights (that had to be done by the builder)

  2. Van's part no: W-715: The bottom of this wing tip is flat and the upper surface curves downward. The tip also gets wider as you move aft along the tip rib. These tips were originally introduced on the RV-7 and give the aircraft a slightly longer wingspan, as well as a "bat wing" appearance. The most distinguishing characteristic is the curved trailing edge as shown in the attached image.

  3. Van's part no: W-715-1:  At first glance this wing tip resembles W-715, but it has a straight trailing edge. It also has a larger cut out area for mounting landing and position lights.

The first step is to compare the upper surface of the tips. If it's flat, it's "old school". If it's not, it's one of the two shear tips. The attached image will show you how to quickly determine which tips you have. If you have any problems, please don't hesitate to contact me. We want to be certain since ER Tanks are not interchangeable with the different wing tip styles.

 

Dimensions:

RV-6 ER Tanks have a critical dimension.  We can build ER Tanks so they fit aircraft "built to plans
" but we prefer to build them to fit YOUR aircraft.  The difference is an easier installation and a perfect fit.  The dimension we'll need is the distance between two nose ribs.  You will be hooking your tape measure to the inside of one lightening hole and measuring to the same location (lightening hole) on another rib.

Which Lightening Hole?

The first lightening hole FORWARD of the main spar.

Between which Nose Ribs?

Measure the distance between the FIRST nose rib OUTBOARD of the main fuel tank (be careful, there are two closely spaced nose ribs here.  Make sure you latch the tape to the one closest to the main fuel tank.) and the OUTERMOST nose rib on the wing. (wing tip nose rib)  Note the measurement and move to the other side of the aircraft.  Once complete, email the left/right dimensions, along with your wing tip type, to CustomerCare@SafeAir1.com.

Is this Difficult?

No, only the wing tips need be removed for this measurement.  Use the widest tape measure you have. It will stay erect at greater distances and make the job a little easier.  A good flashlight or drop light is all you need.  The main fuel tanks can remain in place for this operation, though they will require removal for the installation of your ER Tanks.  With a buddy helping, I would expect the measuring operation to take less than an hour.  Running solo, maybe an hour and a half.

 

rv-7 equipped with "er" tanks

 

Van's RV-7 lends itself very well to additional fuel for owners who use their aircraft for cross country operations.  Shortly after ER Tanks for the RV-6 hit the market, RV-7 "drivers" were wanting tanks for their "rides".  Of course, HWA stepped up to the plate!

Pricing:

ER Tanks for the RV-7 are $1850.00 + Crating, Shipping, and Insurance.  This typically adds $300.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.

Specifications:

  • Weight - Total System Weight = 15 pounds
  • Capacity = Approximately 9.0 Gallons (~4.5 per side)
  • Method of Transfer = Electric Fuel Pump Transfer
  • Wing Tips we can accommodate - Van's W715, W715-1, and Van's "Old School" Tips (Old School Tips were Van's original "flat top" tips sold with the standard RV-4 and RV-6 kits.  Many have been installed on RV-7's)
  • Approximate C.G. Location of ER TANKS = XX.XX

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), pumps, hoses, tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only components not supplied are electrical switches (X2), wiring, and a dollop of Pro-Seal. Each tank holds approximately 4.5 gallons, adding nearly 9 gallons to the total capacity of the RV-7.

ER Tanks, for the RV-7, utilize a "Pump Transfer System".  This system uses an electric fuel pump to transfer fuel from the ER Tank to the main tank.  When the pumps are not energized (OFF), they acts as a valve, preventing the fuel from flowing in either direction.

Fuel flow is controlled by two single-pole, single throw switches in the cockpit.  A single 16 ga wire is sufficient for the circuit.  The pumps are grounded "locally".  When the switches are flipped, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually) 

If we were to feed the engine directly from the ER Tanks, which we do not, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we can utilize the sump and fuel indicators from the main tanks.  The Installation Manual goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter", requiring constant trimming of the aircraft.
  Although we recommend transferring both tanks simultaneously, we recommend using individual switches for each ER Tank.  In the event of an electrical failure, such as a popped circuit breaker, you would still have access to the fuel in one of the ER Tanks.  If both transfer pumps were on the same circuit, and you had a failure (circuit breaker/fuse), you would not have access to fuel in the "other" ER Tank.

Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is 15 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-7.

Real World Weight & Balance Example:

NOTE:  The following is for estimation only and is not to be used for flight planning.  The purpose of this data is to give potential customers an idea of how ER Tanks affect the C.G. in an RV-6.  Unlike production aircraft, Experimental aircraft can vary significantly from each other.  Weight & Balance (including C.G.) calculations must be performed utilizing data collected from EACH aircraft.

Based on an actual RV-7 Flying with ER Tanks, we looked at how the following fuel loads affect the Center of Gravity.  We calculated the following fuel conditions:

Main Tanks Full and ER Tanks Empty
Main Tanks Empty and ER Tanks Empty (theoretical)
Main Tanks Full and ER Tanks Full
Main Tanks Empty and ER Tanks Empty

For this RV-7, and the variety of fuel loads shown above, the C.G. to varied between 82.17" and 82.63" aft of datum, or a total C.G. shift of 0.46".

RV-7 DATUM..........................70" forward of the wing leading edge

RV-7 LIMITS
Design C.G. Range.........................78.7" to 86.8" aft of datum.

RV-7 ARMS
Main Fuel ......................................80.00" aft of datum
ER Tanks & Fuel .............................80.00" aft of datum
Pilot .............................................97.50" aft of datum
Passenger .....................................97.50" aft of datum
Baggage.......................................126.75" aft of datum

Aerobatics:

Aerobatics are not authorized when ER Tanks contain ANY amount of fuel.  Owner/Operator must stay within Van's recommendations for aerobatic flight.  We have NOT conducted Spin Testing with ER Tanks, as a result, we DO NOT recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-7, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea.

Options:

The only option we offer is an Inspection Panel Kit for $75.  One kit has enough components for both wings.  In other words, one kit per aircraft is all that's required.  

The kit contains panels, reinforcement rings, hardware, and instructions that allow the installation of an access panel beneath the wing for pump/hose access.  The panels keep you from having to pull the main tanks every time you want to perform an inspection or maintenance.  I think it's a great idea whether you buy our kit or fabricate your own.  If you're "on the fence" as to whether you'll be installing ER Tanks, we suggest installing the Inspection Panel Kit before you paint the aircraft!

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.



Wing Tips: 
 
Two seat RV's have been produced with 3 different types of wing tips. We need to know which ones you're installing on your aircraft. I'll do my best with verbal descriptions, but I've attached an image to help clarify the issue.


The 3 types of wing tips most common to the RV-7 are:

  1. "Old School" - These are the original tips provided in the original RV-4 and RV-6 kits. The "old school" tips are flat on top, essentially extending the upper wing skin to the outer edge of the wing tip. The bottom surface of the fiberglass wing tip curves upward to meet the straight upper surface. The outboard edge of the wing tip runs parallel to the tip rib of the wing.  (The other two styles taper)  There were no factory cut outs for the lights (that had to be done by the builder)
  2. Van's part no: W-715: The bottom of this wing tip is flat and the upper surface curves downward. The tip also gets wider as you move aft along the tip rib. These tips were originally introduced on the RV-7 and give the aircraft a slightly longer wingspan, as well as a "bat wing" appearance. The most distinguishing characteristic is the curved trailing edge as shown in the attached image.
  3. Van's part no: W-715-1:  At first glance this wing tip resembles W-715, but it has a straight trailing edge. It also has a larger cut out area for mounting landing and position lights.
    The first step is to compare the upper surface of the tips. If it's flat, it's "old school". If it's not, it's one of the two shear tips. The attached image will show you how to quickly determine which tips you have. If you have any problems, please don't hesitate to contact me. We want to be certain since ER Tanks are not interchangeable with the different wing tip styles.

 





rv-8 equipped with "er" tanks

 

Van's RV-8 lends itself very well to additional fuel for owners who use their aircraft for cross country operations.  Shortly after ER Tanks for the RV-6 hit the market, RV-8 "drivers" were wanting tanks for their "rides".  Of course, HWA stepped up to the plate!

Pricing:

ER Tanks for the RV-8 are $1850.00 + Crating, Shipping, and Insurance.  This typically adds $300.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.

Specifications:

  • Weight - Total System Weight = 15 pounds
  • Capacity = Approximately 9.0 Gallons (~4.5 per side)
  • Method of Transfer = Electric Fuel Pump Transfer
  • Wing Tips we can accommodate - Van's W715, W715-1, and Van's "Old School" Tips (Old School Tips were Van's original "flat top" tips sold with the standard RV-4 and RV-6 kits.  Many have been installed on RV-8's)

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), pumps, hoses, tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only components not supplied are electrical switches (X2), wiring, and a dollop of Pro-Seal. Each tank holds approximately 4.5 gallons, adding nearly 9 gallons to the total capacity of the RV-8.

ER Tanks, for the RV-8, utilize a "Pump Transfer System".  This system uses an electric fuel pump to transfer fuel from the ER Tank to the MAIN tank.  When the pumps are not energized (OFF), they act as a valve, preventing the fuel from flowing in either direction.

Fuel flow is controlled by two single-pole, single throw switches in the cockpit.  A single 16 ga wire is sufficient for the circuit.  The pumps are grounded "locally".  When the switches are flipped, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually)  

If we were to feed the engine directly from the ER Tanks, which we do not, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we can utilize the sump and fuel indicators from the main tanks.  The Installation Manual goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter", requiring constant trimming of the aircraft.
  Although we recommend transferring both tanks simultaneously, we recommend using individual switches for each ER Tank.  In the event of an electrical failure, such as a popped circuit breaker, you would still have access to the fuel in one of the ER Tanks.  If both transfer pumps were on the same circuit, and you had a failure (circuit breaker/fuse), you would not have access to fuel in the "other" ER Tank.

Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is 15 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-8.

Aerobatics:

Aerobatics are not authorized when ER Tanks contain ANY amount of fuel.  Owner/Operator must stay withing Van's recommendations for aerobatic flight.  We have NOT conducted Spin Testing with ER Tanks, as a result, we do not recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-8, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea.

Options:

The only option we offer is an Inspection Panel Kit for $75.  One kit has enough components for both wings.  In other words, one kit per aircraft is all that's required.  

The kit contains panels, reinforcement rings, hardware, and instructions that allow the installation of an access panel beneath the wing for pump/hose access.  The panels keep you from having to pull the main tanks every time you want to perform an inspection or maintenance.  I think it's a great idea whether you buy our kit or fabricate your own.  If you're "on the fence" as to whether you'll be installing ER Tanks, we suggest installing the Inspection Panel Kit before you paint the aircraft!

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.


Wing Tips: 
 
Two seat RV's have been produced with 3 different types of wing tips. We need to know which ones you're installing on your aircraft. I'll do my best with verbal descriptions, but I've attached an image to help clarify the issue.


The 3 types of wing tips most common to the RV-8 are:

  1. "Old School" - These are the original tips provided in the original RV-4 and RV-6 kits. The "old school" tips are flat on top, essentially extending the upper wing skin to the outer edge of the wing tip. The bottom surface of the fiberglass wing tip curves upward to meet the straight upper surface. The outboard edge of the wing tip runs parallel to the tip rib of the wing.  (The other two styles taper)  There were no factory cut outs for the lights (that had to be done by the builder)
  2. Van's part no: W-715: The bottom of this wing tip is flat and the upper surface curves downward. The tip also gets wider as you move aft along the tip rib. These tips were originally introduced on the RV-7 and give the aircraft a slightly longer wingspan, as well as a "bat wing" appearance. The most distinguishing characteristic is the curved trailing edge as shown in the attached image.
  3. Van's part no: W-715-1:  At first glance this wing tip resembles W-715, but it has a straight trailing edge. It also has a larger cut out area for mounting landing and position lights.
    The first step is to compare the upper surface of the tips. If it's flat, it's "old school". If it's not, it's one of the two shear tips. The attached image will show you how to quickly determine which tips you have. If you have any problems, please don't hesitate to contact me. We want to be certain since ER Tanks are not interchangeable with the different wing tip styles.

 


rv-9 EQUIPPED with "er" tanks

 

NOW AVAILABLE FOR U.S. CUSTOMERS ONLY

ER Tanks for the RV-9 are now available for U.S. Customers ONLY.  Once we get a few more sets in the field, we'll offer them to our international customers.

NOTE:  ER Tanks for the RV-9 are a little more complicated to install, compared to other RV models.  If you built your RV-9, and still have all your sheetmetal tools, this will not be difficult.  However, if you don't have experience building an RV, this might be a little challenging and I'd encourage you to consider having Hotel Whiskey Aviation (located near Dallas, TX) perform the installation.  Installations start at $900.  Contact SafeAir1 for questions or scheduling.

Van's RV-9 lends itself very well to additional fuel for owners who use their aircraft for cross country operations, especially, those running 150+ hp engines.  Standard fuel load is a little light for many owners wishing to fly non-stop while keeping their "personal" minimums high.  Shortly after the RV-9 hit the market, owners were more fuel capacity.  The RV-9 presented some challenges not found in the other RV's.  Specifically, the ER Tank "tube" had to be a smaller diameter due to smaller lightening holes in the wing's nose ribs.

Pricing:

ER Tanks for the RV-8 are $2575.00 + Crating, Shipping, and Insurance.  This typically adds $500.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.

Specifications:

  • Weight - Total System Weight = About 15 pounds
  • Capacity = Approximately 10 Gallons (~5 gallons per side)
  • Method of Transfer = Electric Fuel Pump Transfer
  • Wing Tips we can accommodate - Standard RV-9 Tips from Van's

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), pumps, hoses, tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only components not supplied are electrical switches (X2), wiring, and a dollop of Pro-Seal. Each tank holds approximately 5.0 gallons, adding nearly 10 gallons to the total capacity of the RV-9.

ER Tanks, for the RV-9, utilize a "Pump Transfer System".  This system uses an electric fuel pump to transfer fuel from the ER Tank to the MAIN tank.  When the pumps are not energized (OFF), they acts as a valve, preventing the fuel from flowing in either direction.

Fuel flow is controlled by two single-pole, single-throw switches in the cockpit.  A single 16 ga wire is sufficient for each circuit.  The pumps are grounded "locally".  When the switches are flipped, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually)  

If we were to feed the engine directly from the ER Tanks, which we do not, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we can utiize the sump and fuel indicators from the main tanks.  The Installation Manual goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter", requiring constant trimming of the aircraft.
  Although we recommend transferring both tanks simultaneously, we recommend using individual switches for each ER Tank.  In the event of an electrical failure, such as a popped circuit breaker, you would still have access to the fuel in one of the ER Tanks.  If both transfer pumps were on the same circuit, and you had a failure (circuit breaker/fuse), you would not have access to fuel in the "other" ER Tank.

Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is 15 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

 

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-9.

Aerobatics:

Aerobatics are not authorized when ER Tanks contain ANY amount of fuel.  In addtion, Van's does NOT consider the RV-9 top be an aerobatic aircraft.  We have not conducted Spin Testing with ER Tanks, as a result, we do not recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-9, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea.

Inspection Panel Kit

An Inspection Panel Kit is included with the RV-9 ER Tank Kit.  Unlike other RV models, this kit is mandatory for the RV-9.  Access for installation is too limited without the Inspection Panel Kit.  One kit has enough components for both wings.  In other words, one kit per aircraft is all that's required.  

The kit contains panels, reinforcement rings, hardware, and instructions that allow the installation of an access panel beneath the wing for pump/hose access.  The panels keep you from having to pull the main tanks every time you want to perform an inspection or maintenance.  If you're "on the fence" as to whether you'll be installing ER Tanks, we suggest installing the Bung Kit and theInspection Panel Kit before you paint the aircraft!

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.


Wing Tips: 
 

We only offer ER Tanks that fit the factory RV-9 wing tips.

 

rv-10 equipped with "er" tanks

 

Van's RV-10 lends itself very well to additional fuel for owners who use their aircraft for cross country operations.  Standard fuel load is a little light for many owners wishing to fly non-stop while keeping their "personal" minimums high.  Shortly after the RV-10 hit the market, RV-10 "drivers" were wanting ER Tanks for their "rides".  Of course, HWA stepped up to the plate!  

Pricing:

ER Tanks for the RV-10 are $2400.00 + Crating, Shipping, and Insurance.  This typically adds $500.00 to the total cost when shipping within the contiguous U.S.A.  Tanks picked up by the customer, or shipped to addresses within the state of Texas, are subject to 8.25% sales tax.  We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are acceptable.

Specifications:

  • Weight - Total System Weight = 15 pounds
  • Capacity = Approximately 15 Gallons (~7.5 per side)
  • Method of Transfer = Electric Fuel Pump Transfer
  • Wing Tips we can accommodate - Standard RV-10 Tips from Van's

System Description / Operation:

ER Tank Systems are comprised of two tanks (one for each wing), pumps, hoses, tubing, fuel caps, hardware, and all the fittings required to perform the installation. The only components not supplied are electrical switches (X2), wiring, and a dollop of Pro-Seal. Each tank holds approximately 7.5 gallons, adding nearly 15 gallons to the total capacity of the RV-10.

ER Tanks, for the RV-10, utilize a "Pump Transfer System".  This system uses an electric fuel pump, mounted outboard of the main fuel tank, to transfer fuel from the ER Tank to the main tank.  When the pump not energized (OFF), it acts as a valve, preventing the fuel from flowing in either direction.

Fuel flow is controlled by single pole, single throw switches in the cockpit.  A single 16 ga wire is sufficient for the circuit.  The pumps are grounded "locally".  When the switches are flipped, fuel moves from the ER Tanks to the MAIN tanks. (Each ER Tank is vented individually)  

If we were to feed the engine directly from the ER Tanks, which we do not, each ER Tank would require a sump and fuel indicator.  By pumping the fuel into the mains, we can utilize the sump and fuel indicators from the main tanks.  The Installation Manual goes into further detail but the gist of it is to transfer fuel the same time, every time.  By doing so, you learn what a normal transfer "looks" like.  Once you complete the installation and testing, you'll have total confidence in the system.

Normal operation (in flight) will require you burn enough fuel from the MAIN tanks to transfer the entire contents of the ER Tanks.  Fuel should be transferred simultaneously from both ER Tanks only during straight and level flight.  This prevents imbalances in the aircraft, and eliminates the requirement to keep re-trimming the aircraft.  If you transfer individually, one wing would keep getting "lighter", requiring constant trimming of the aircraft.
  Although we recommend transferring both tanks simultaneously, we recommend using individual switches for each ER Tank.  In the event of an electrical failure, such as a popped circuit breaker, you would still have access to the fuel in one of the ER Tanks.  If both transfer pumps were on the same circuit, and you had a failure (circuit breaker/fuse), you would not have access to fuel in the "other" ER Tank.

Below you can see how the ER Tank is located just ahead of the wing spar. This configuration minimizes changes to the empty and operational C.G. characteristics of your airplane.

The empty weight of the entire ER Tank System (Left & Right) is 15 pounds but you will still need to re-calculate the weight and balance data for your aircraft and incorporate this information in your revised flight operations manual.

 

All ER Tanks are pressure tested for integrity before shipping.  No welding is required by the customer.  (Some images may depict ER Tanks during the fabrication process, and may not represent the finished product.)

ER Tank Systems include a SAMPLE Flight Manual Supplement and recommendations for testing and transferring fuel.  However, it is up to the owner/builder to perform proper flight testing, procedures, and insure proper in-flight ER Tank operation.

See the "Benefits" link from the horizontal menu bar above to learn why ER Tanks might be an excellent addition to your RV-10.

Aerobatics:

Aerobatics are not authorized when ER Tanks contain ANY amount of fuel.  In addition, Van's does NOT consider the RV-10 top be an aerobatic aircraft.  We have NOTconducted Spin Testing with ER Tanks, as a result, we DO NOT recommend spins in aircraft equipped with ER Tanks

Things to Consider:

If you're contemplating the installation of ER Tanks in your RV-10, you should consider purchasing a "Bung Kit".  Select the "Bung Kit" link from the horizontal menu bar above to learn why this might be a good idea.

Options:

The only option we offer is an Inspection Panel Kit for $75.  One kit has enough components for both wings.  In other words, one kit per aircraft is all that's required.  

The kit contains panels, reinforcement rings, hardware, and instructions that allow the installation of an access panel beneath the wing for pump/hose access.  The panels keep you from having to pull the main tanks every time you want to perform an inspection or maintenance.  I think it's a great idea whether you buy our kit or fabricate your own.  If you're "on the fence" as to whether you'll be installing ER Tanks, we suggest installing the Inspection Panel Kit before you paint the aircraft!

Installation:

ER Tanks must be installed in a completed wing.  If you install the tanks before the wing is finished, you may not have access to buck the wing skin rivets.  Of course, it's more efficient to install ER Tanks in a aircraft that's under construction but they are intended to be easily installed in flying aircraft, too.  I would estimate 25% of ER Tanks sold are installed in aircraft that are already flying.

Allow three full days for installation.  If you're aircraft is still under construction with the wing root fairings and wing tips removed, and no worries regarding paint, you're installation will go a little quicker.  However, nothing about installing ER Tanks is difficult, it's just takes some time.  For the most part, ER Tanks can be installed by one person but there are a few "moments" when having two people can really speed the process.

ER Tank Kits are very complete.  About the only thing not included in the kit is Pro-Seal.  You'll only need a dollop (about the size of a golf ball) for the entire installation.  If you don't have any, check with builders in your local area or put a request out on one of the online forums.  (Make sure it's not expired) 

Installation Services:

If you're not up to installing ER Tanks yourself, HWA offers installation services.  For more information, click on the "Installation" tab of the horizontal menu above (Under "Fuel Tanks")

How to Order:

Due to the popularity of ER Tanks, and the expansion of our product line, there has been a backlog for ER Tanks for quite some time.  The current backlog is approximately 4 weeks.

If you want to reserve a slot, we ask for a $200 deposit. Checks, payable to Hotel Whiskey Aviation, LLC, should be mailed to: 
 
Hotel Whiskey Aviation, LLC
10045 Taylorcraft
McKinney, TX 75071

We DO NOT accept credit cards for ER Tank purchases.  Personal checks, bank checks, or money orders are fine.
 
Should you mail a deposit, please email info@hotelwhiskeyaviation.com and let us know and we will pencil you in for the next available production slot.  The bung connectors are part of the ER Tank Kit but if you want to get started with that portion of the installation right away, we can send out the bung kit when we receive your deposit.  Be advised there will be an addition S&H fee of $10 for sending the bung kits in advance of the ER Tanks.

With your order, we will need to know what kind of wing tips you have, and a couple of dimensions.


Wing Tips: 
 

We only offer ER Tanks that fit the factory RV-10 wing tips.

 

"ER" TANK INSTALLATIONS

 

Hotel Whiskey Aviation (HWA) offers Installation Services for the entire ER TANK product line.  Prices start at $950.  HWA is located a few miles north of Dallas, TX.  We like to have the aircraft 3-5 days.  

A few reasons why your installation might cost more than $950:

  • Move landing/taxi lights
  • Reroute wiring or conduit
  • Relocate Strobe Boxes
  • Wing tips are Pop-Riveted in place (Wing tips attachment will need to be converted to plate nuts and screws)
  • Installation of Inspection Panel Kit (owner option)

I think you get the idea.  Until the aircraft arrives for evaluation, we can't say for sure what the final price will be.  However, we can provide references from previous customers who will attest to HWA's integrity.  In the end, we want our customers to consider this a positive experience, one they would recommend to their friends.

 


fuel bung kits

 

(Above)  Bung Kit for RV-4 & RV-6 - "Gravity Feed" Systems

(Above)  Bung Kit for RV-4 & RV-6 - "Gravity Feed" Systems

Bung Kits are part of the ER Tank System.  If you order a set of ER Tanks, it will come with a Bung Kit.

Why buy a Bung Kit if it comes with the tanks?  

There are several reasons why you might want to order a Bung Kit before ordering your ER Tanks.  A few examples:

  • You'd like to delay the purchase of your fuel tanks until you're closer to completing the aircraft.  Bung Kits are cheap and you can get the "infrastructure"in place early, making a future installation easier.
  • You're project is rolling along nicely but HWA has a 6 week backlog on ER Tanks.  You'd like to get moving with the ER Tank installation while your tanks are being built.  
  • You're "on the fence" and not sure whether your type of flying would benefit from ER Tanks.  By installing the Bung Kit while your aircraft is under construction you can more easily add ER Tanks after the aircraft is flying.

The resounding theme here is to make sure the Bungs are installed BEFORE you put fuel in the main tanks and BEFORE the aircraft is painted.  If you don't, you can still put ER Tanks in your aircraft but you'll have to be extremely vigilant when it comes to preparing surfaces for Pro-Seal (The Bungs are Pro-Sealed and Pop Riveted to the Main Tanks - Much like the fuel sump bungs).  The bottom line is your surfaces must be absolutely clean.   Of course, a painted aircraft has some additional challenges compared to unpainted, most of which are associated with protecting the surfaces.

NOTE:  If you purchase a Bung Kit, please notify Hotel Whiskey Aviation when ordering your ER Tanks and we'll delete the Bung Kit from your ER Tank order and apply a $50 credit to your invoice.

What does the Bung Kit do?

The ER Tank Bung Kit "taps" into the main fuel tank endwall and the brass plug seals the bung. Now your airplane is prepped for easy future installation of ER Tanks.

Where are the Bungs installed?

  • In the RV-4 and RV-6 - Bungs are installed on the inboard endwall of the main fuel tanks.  (About 8" aft of the leading edge, near the bottom of the tank)
  • In the RV-7, RV-8, RV-9, and RV-10 - Bungs are installed on the outboard endwall of the main fuel tanks.  (In the upper, aft corner)
  • NOTE:  The Bung Kits for the two different systems are NOT the same.  Be sure you order the correct Bung Kit for your aircraft!

Why the difference in Bung location?

Bung location depends on whether your aircraft utilizes a gravity feed system or electric pumps to transfer the fuel.

(Above) RV-9 Bung Installation (Right Wing - Outboard end of MAIN fuel Tank)  

(Above) RV-9 Bung Installation (Right Wing - Outboard end of MAIN fuel Tank)

 

What if you never install ER Tanks?

Bung Kits include brass plugs.  Install the Bungs, insert the plugs, and you're good to go, whether ER Tanks are eventually installed, or not.

How many Bung Kits do I need?

Only one Bung Kit is required per aircraft.  A single Bung Kit has two bungs and all the hardware necessary to "tap" both main fuel tanks.

Does the Bung Kit include all the materials for installation?

Everything except a dollop of Pro-Seal.  Of course, you can buy Pro-Seal through Van's or you can check with builders in your area.  It seems someone's always got a partial can laying around.  (Confirm it's not expired!)

Bung Kit for RV-7, RV-8, RV-9, and RV-10 - Transfer Pump Systems    

Bung Kit for RV-7, RV-8, RV-9, and RV-10 - Transfer Pump Systems

 

 

Bung Kits are $59.50 and we'll ship them for FREE !! (Within contiguous U.S.)

How do I purchase a Bung Kit?

Please email us directly for Bung Kits: info@hotelwhiskeyaviation.com

 If you'll include your mailing address, we'll get a Bung Kit out ASAP and drop an invoice in the box. 

Add value to your RV and save work down the road.  Install a Bung Kit and make your aircraft ER Tank "ready".