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  #1  
Old 02-03-2013, 07:22 AM
Juan Pablo Juan Pablo is offline
 
Join Date: Nov 2009
Location: Rojas, BA, Argentina
Posts: 40
Cool Auxiliary tank

Anyone tried to put an auxiliary fuel tank in the rear baggage area in the RV-8?
Any ideas? How can I get the fuel into the engine from there?
Thanks

Pablo Fern?ndez
Miguel Scalise
RV-8 LV-X418
130 hs TT
ROJAS, BA, ARGENTINA

Last edited by Juan Pablo : 02-03-2013 at 07:27 AM. Reason: Duplicate
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  #2  
Old 02-03-2013, 08:19 AM
jthocker's Avatar
jthocker jthocker is offline
 
Join Date: Jan 2005
Location: Cincinnati, Ohio
Posts: 1,060
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Quote:
Originally Posted by Juan Pablo View Post
Anyone tried to put an auxiliary fuel tank in the rear baggage area in the RV-8?
Any ideas? How can I get the fuel into the engine from there?
Thanks

Pablo Fernández
Miguel Scalise
RV-8 LV-X418
130 hs TT
ROJAS, BA, ARGENTINA
Yes Juan it can be done!



This tank is my adaptation shamelessly stolen from fellow teammate Robert Gibbons. It's a 16 gallon circle track racing tank. It sits on a ramp to clear the flap actuator tube. Dry break fittings on the hoses allow quick disconnects for fuel feed and venting. The standard Vans fuel selector valve has an unused port that is now used as the Aux position. The hose lays in the cockpit. The vent line is in the aft baggage wall. The tank is strapped down in the baggage comp and via the rear seat belt. With the tank all the way aft there is room to reverse the rear seatback hinge and it will then rest against the mid cockpit brace.







An email with all the listed parts and links.

Wizz,

Here is the list of all the parts for the tanks Greese, Leggs, and I have.
A little over about 500 bucks for the parts.

Mutha/ Badger

Begin forwarded message:

From: Jon Thocker
Date: October 23, 2012 10:53:31 AM EDT
To: Smokey
Subject: Tank parts

Smokey and others,

Here is a list of parts and links for the 16 gallon tank I am using:

First is the actual tank http://www.jegs.com/i/RCI/821/1161C/...oductId=755349

The dimensions given online do not match the actual dimensions the tank is smaller measuring more like 23 x 17.5 x 11 instead of 25 x 19 x 11
the tank came in a box marked RCI so it probably matches the dimensions for the RCI tanks in the Summit Racing catalog.

Hose parts:

Fuel feed

http://www.summitracing.com/search/?...d=220122&dds=1 fuel tank AN reducer from -8 to -6


http://www.summitracing.com/parts/AER-FCA0606/ -6 hose 6 feet

http://www.summitracing.com/parts/SUM-220687/ reducer to fuel feed line 90 degree hose end -6

http://www.summitracing.com/parts/SUM-220690/ -6 hose end need 2 for splicing in a fuel filter


http://www.summitracing.com/parts/RUS-650133/ a cleanable fuel filter


https://www.pegasusautoracing.com/pr...asp?RecID=5543 90 degree quick disconnect -6 hose


https://www.pegasusautoracing.com/pr...asp?RecID=3411 qk disc plug -6 an female




Fuel vent

http://www.summitracing.com/parts/EAR-9892084ERL/ reducer from AN -8 to -4


http://www.summitracing.com/parts/SUM-220487/ reducer to fuel vent hose 90 degree hose end -4


http://www.summitracing.com/parts/SUM-220982/ -4 hose 10 feet , need 3 ft


https://www.pegasusautoracing.com/pr...asp?RecID=3032 qk disc -4 hose


https://www.pegasusautoracing.com/pr...asp?RecID=4254 qk disc plug -4 an female



https://www.pegasusautoracing.com/pr...p?Product=3239 AN bulkhead 90 degree need 1 -6, 1 -4


https://www.pegasusautoracing.com/pr...p?Product=3226 Straight bulkhead fitting for connection on fuselage bottom -4 AN

https://www.pegasusautoracing.com/pr...p?Product=3237 bulkhead nuts

https://www.pegasusautoracing.com/pr...p?Product=3235 coupling nuts AN -6 and -4


https://www.pegasusautoracing.com/pr...p?Product=3236 AN flare sleeves -6 and -4


http://www.vansaircraft.com/cgi-bin/...ube&action=add Aluminum fuel line



http://www.vansaircraft.com/cgi-bin/...ube&action=add aluminum vent line



http://www.aircraftspruce.com/catalo...?clickkey=4587 tubing bender



For my installation I built a ramp to go over the flap actuator tube 3/4 inch oak plywood measuring 22" long by 18' wide, with a 2" x 3" x 18" and a 1" x 3" x 18" stacked, to support the front of the ramp fwd of the actuator tube, then another 2" x 3" x 18" positioned aft of the actuator tube to further support the ramp mid span

I'll follow up with some pics.

Badger

The Jiffy tite fittings are available from Summit but are harder to find online




I'll try to get a pic of the tank installed later today.
__________________
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Last edited by jthocker : 02-03-2013 at 08:33 AM.
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  #3  
Old 02-03-2013, 10:25 AM
Mark Albery's Avatar
Mark Albery Mark Albery is offline
 
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Location: Warwickshire UK
Posts: 721
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I've done something very similar to Jon, but using the front locker.

I just needed an extra 10 gallons to have comfortable reserve for a planned ferry flight.

If you have the Van's fuel valve then plumbing in is very simple. Remove the pipe thread plug and screw in a pipe thread to 3/8 hose adapter. This is how Jon Johannson plumbed in his ferry tanks on his round-the-world trips and avoids the need for a transfer pump.

The electric boost pump has plenty of dry lifting capacity to prime the line, but it's still a good idea to ground run from the aux. tank after filling it, then switch to the standard tanks for take-off.

The polyethylene tank will need to be secured. You could buy the tie-down straps that they sell for the tanks, but it's cheaper to just bend up some strips of 1/8*1/2 alloy and bolt down to the floor.
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  #4  
Old 02-03-2013, 10:55 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
Posts: 5,590
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For my 9A, I've been planning a ferry tank fuel setup since an around-the-world trip is on my retirement bucket list. I have return lines to both tanks on my plane, I just tapped into the right wing return line and put a port there. A small facet carburetor electric fuel pump will be more than enough to pump the contents of a ferry tank into the return line and into the right wing tank, and then the rest of the fuel system operates as normal.

I've got the outboard wing leading edges converted to additional fuel tanks as well, giving me right at 70 gallons in the wings. With a 40 gallon ferry tank in the passenger seat to keep CG happy, that should give me California-to-Hawaii range with a 2 hour reserve. That's the longest non-fuel leg you'll find on the globe, if you can make that then you can go anywhere you want. Yes, that would be an over-gross takeoff and returning to the airport that heavy would make for an overweight landing inspection, I'm aware of that. In all likelihood the airplane would only be asked to do that 5 or 6 times in it's life.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.

Last edited by airguy : 02-03-2013 at 11:00 AM.
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  #5  
Old 02-07-2013, 02:48 AM
81270 81270 is offline
 
Join Date: Mar 2007
Location: Gold Coast - Australia
Posts: 137
Thumbs up

I'll try to get a pic of the tank installed later today.[/quote]

Just to let you know there's myself and I'm others who are keen to the installation.
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Peter Vernon
Eagle Heights, Queensland, Australia
RV8, QB Wings, Standard Build Fuse (85% @ April 12)
email: pve95448@bigpond.net.au

Paid dues ... pleased to support DR
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  #6  
Old 02-07-2013, 06:33 AM
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jthocker jthocker is offline
 
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Location: Cincinnati, Ohio
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Quote:
Originally Posted by VH-VRN View Post
I'll try to get a pic of the tank installed later today.
Just to let you know there's myself and I'm others who are keen to the installation.[/quote]

Sorry Peter,
I'm in the middle of a move and without Internet at at home, I'll post more pics soon!
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  #7  
Old 02-07-2013, 07:56 AM
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Toobuilder Toobuilder is offline
 
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Jon,

With that much fuel so far aft, what is your method for managing CG throughout the flight? I would expect that you tap into the rear tank last, trying to maintain the aft CG as long as possible if for nothing else, the reduction in trim drag. Obviously, you normally have the airplane within CG with zero fuel, but we are all supposed to land with reserve fuel - might as well be in the rear to keep the CG as close as possible to the takeoff configuration. I bring this up because I'm having the same internal debate concerning a planned fwd fuse tank mod for a Rocket. Of course, the fwd tank has a shorter arm than the rear tank, so if you can make it work (CG management), then it should be even easier for me.

...oh Mark, thanks for the reminder about the unused port on the fuel selector - that will make my mod a little easier.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C

Last edited by Toobuilder : 02-07-2013 at 08:01 AM.
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  #8  
Old 02-07-2013, 08:06 AM
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Toobuilder Toobuilder is offline
 
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BTW, though the "circle track" fuel cell pulls fuel from the top, the "drag race" version usually pulls from a small sump on the bottom... Might work out better in some installations. These things come in all sizes from 1 to 20+ gals too, so chances of finding what you need are pretty good.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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  #9  
Old 02-07-2013, 07:04 PM
jthocker's Avatar
jthocker jthocker is offline
 
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Location: Cincinnati, Ohio
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Quote:
Originally Posted by Toobuilder View Post
Jon,

With that much fuel so far aft, what is your method for managing CG throughout the flight? I would expect that you tap into the rear tank last, trying to maintain the aft CG as long as possible if for nothing else, the reduction in trim drag. Obviously, you normally have the airplane within CG with zero fuel, but we are all supposed to land with reserve fuel - might as well be in the rear to keep the CG as close as possible to the takeoff configuration. I bring this up because I'm having the same internal debate concerning a planned fwd fuse tank mod for a Rocket. Of course, the fwd tank has a shorter arm than the rear tank, so if you can make it work (CG management), then it should be even easier for me.

...oh Mark, thanks for the reminder about the unused port on the fuel selector - that will make my mod a little easier.
Mike,
You're over thinking this, there is no rear seat pax. I burn the fuel out of that tank as fast as I can. No way I want to lift that tank out with anymore than the half gallon that is unusable do to tilt. Incidentally the fuel pick up is in the left rear corner of the tank, all the way at the bottom.
With my firewall battery and Hartzell prop it is almost impossible for me to be out the aft CG, so I don't even worry about landing CG. I'll leave reducing trim drag to racers and engineers!
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  #10  
Old 02-07-2013, 07:24 PM
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Toobuilder Toobuilder is offline
 
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Yes, I redid my W&B spreadsheet to incorporate a front and rear tank so I could play with the numbers and it is not as bad as I thought it would be. Clearly, it is not a critical condition as long as you pay attention to the loading.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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