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04-14-2014, 07:18 PM
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Join Date: Apr 2006
Location: Porter Texas
Posts: 133
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Extra fuel
Has anyone ever put dual fuel tanks on each wing I have four complete tanks and was looking for any reason why it wouldn't work.
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Dean Brister
N330RV RV-7A I0-360-A1A 200HP (sold)
N670RV RV-9 O-320 160HP (Sold)
[email] deanbrister@gmail.com
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04-14-2014, 08:02 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Yes, it has been done before.
I just jad this discussion with another member of this forum last night.
Here is what we discussed:
1. Decide how much extra fuel you want. Then divide 18 by the number of bays in the tank and cut it down to meet your requirements.
2. Make the entire piece of leading edge that will bridge the two tanks removable rather than just adding an access plate.
3. Do the RV-10/Rocket coil for the vent line outboard of the tank and poke it out the bottom of the wing.
4. Getting the fuel to the engine is a bigger debate than the nay sayers will have about adding these tanks. You can add electric fuel pumps to move the outboard fuel to the onboard tanks. My favorite idea is to buy a valve (Andair?) that has five positions (Left outboard, left inboard, off, right onboard, and right outboard). That is the simplest to plumb and doesn't require the complexity of fuel pumps, wiring, fueses, etc.
Good luck and please report back with your configuration.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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04-14-2014, 08:28 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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Why are there two threads with this title -
Moderator??
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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04-15-2014, 06:26 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Yes Sir...
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Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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04-15-2014, 07:44 AM
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Join Date: Mar 2008
Location: Plattsville, Ontario
Posts: 59
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Fuel = weight consider lateral C of G
Quote:
Originally Posted by brister
Has anyone ever put dual fuel tanks on each wing I have four complete tanks and was looking for any reason why it wouldn't work.
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Hi Dean,
I hate to be the devil's advocate here. Personally I considered making long range fuel tanks. I decided against it since we have short range bladders and a few other factors that boils down to not wanting to push the envelope too much.
With a whole bunch of extra weight out near the wing tips one would have to think about the handling characteristics of the aircraft. Most worrisome would be the question "would it be possible to recover from a spin with all the extra mass outboard like that?" Correct me if I'm wrong but I believe this is why the RV 7 has a bigger rudder.... People were using heavier engines than recommended by Vans, so he made the rudder bigger for spin recovery, also the RV7 has a bit more fuel than the RV6 putting more mass outboard.
How would it handle? Like a zippy RV or a sluggish pig?
I'm not saying that it can not be done, cause people have done it. Perhaps a chat with Vans is in order here to decide if it is something that you would really want to do.
Happy Building,
Steve Wolfe
P.S. I'm not an AME, just my cents worth to be sure you consider the center of gravity.
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04-15-2014, 08:53 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Nope
No need to call Van's....we already know their answer.
Jon Johannson had 15+ hours of fuel in his -4...300lbs. of that in the back seat!
Best,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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04-26-2014, 05:24 PM
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Join Date: Oct 2013
Location: Sydney
Posts: 185
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And correct me of I'm wrong but the 7 and the 9 now have the exact same rudder  |
04-27-2014, 02:24 AM
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Join Date: Jul 2013
Location: Delta Junction, AK
Posts: 68
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Tuckey Tanks
Pat still has one of the more elegant solutions. KISS principle at work. Outboards always feed first ensuring that the lateral CG is diminishing until the outboards are empty. Transfer pump rounds out the belt and suspenders approach.
http://napwars.com/RV-8HTML/Fuel.htm
(Yes, I understand that actually fuel is drawn from the inboards and replaced by the outboards until the outboards are empty.)
__________________
Tom
MSgt, USAF, Ret
N318RV Reserved
Gathering tools
Dues paid
There are 10 kinds of people in the world, those who understand Binary and those who don't.
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