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Old 09-15-2019, 01:40 AM
HansLab HansLab is offline
Join Date: Jan 2015
Location: Netherlands
Posts: 78
Default Fuel Flow Test + angle

In the PAP I can read the procedure, however I don't see need to raise the front (my KitFox had to be raised +5% above the max take-off angle - some 20 degrees from level).
Am I missing things?
Hans Labruyere
build & sold project Kitfox IV
Bought project & building RV12 #120742
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Old 09-16-2019, 10:22 AM
rongawer rongawer is offline
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 512

The advisory circular for experimental aircraft testing 80-99B, states to do flow testing at 5º above the highest anticipated climb angle. Understanding that Van's designed the RV12 for E-LSA, so therefore they've already done flow testing to ensure fuel flow at that highest anticipated angle.

I did my RV12 E-AB, so I did a full fuel flow test. I have found that my 12 can climb at 15º for a while, so 20º makes sense for testing.

The PAP fuel procedure is really just to help you calibrate your fuel gauge and mark your fuel tank for minimum fuel, not perform a full fuel flow test.

If you pull the RV12 tail to the ground, your nose angle will be 15º up. You can certainly put blocks under the main wheels to get to 20º if you desired, which is what I did. Just note that this testing was done at whatever angle and minimum fuel available at whatever angles you ended up with and keep that in the POH for future reference.

I'm sure the pundits will be along shortly to restate this more eloquently...
Ron Gawer

- RV10, Build in progress.
- RV12, N975G, "The Commuter"
- Several others that are now just great memories for me.

Last edited by rongawer : 09-16-2019 at 10:45 AM.
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Old 09-16-2019, 11:07 AM
HansLab HansLab is offline
Join Date: Jan 2015
Location: Netherlands
Posts: 78

Yes, Ron, this was what I was looking for. Thanks for sharing. 20 degrees looked fine as well, I'll dig a hole next to the runway again (the one from testing the Kitfox is still there...).
Could you share the amount of fuel you put in to be able to reach the fingerstrainer in that angle, please? I guess it should be quite a lot?
[edit] but reading along the reactions I figure just that is the 4,5 Gallon 'reserve fuel'. It isn't reserve, but sufficient to keep the fingers trainer from running dry (and have the pump suck air).
Thanks everyone!
Hans Labruyere
build & sold project Kitfox IV
Bought project & building RV12 #120742

Last edited by HansLab : 09-18-2019 at 12:21 AM.
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Old 09-16-2019, 02:24 PM
NinerBikes NinerBikes is offline
Join Date: Dec 2018
Location: Granada Hills
Posts: 228

I believe an older RV-12 with the right hand side fuel tank is rated at about 4.5 to 5 gallons of reserve fuel, if built to E LSA standards.
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Old 09-16-2019, 04:51 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,521

The legacy RV-12 tank is fully usable to the last drop. POH states minimum of 4 gallons for takeoff so tank doesn't un-port in an extended climb.
Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 502

LSRM-A Certificate 2016
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MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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Old 09-16-2019, 08:19 PM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 108

I canít find any requirement in the PAP to raise the nose for fuel testing.
Steve Morrow
RV-12 N12SM
Builder 121036
White Salmon, WA
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Old 09-17-2019, 12:18 AM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,332

That is because the test as described in the PAP is taking an all wheels on ground attitude into account. If it passes the test as described, the entire system is considered to have passed.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")

Last edited by rvbuilder2002 : 09-17-2019 at 12:20 AM.
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