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  #1  
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?
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  #2  
Old 09-16-2019, 10:22 AM
rongawer rongawer is offline
 
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Location: Brentwood, CA
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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...
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Last edited by rongawer : 09-16-2019 at 10:45 AM.
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  #3  
Old 09-16-2019, 11:07 AM
HansLab HansLab is offline
 
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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!
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Last edited by HansLab : 09-18-2019 at 12:21 AM.
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  #4  
Old 09-16-2019, 02:24 PM
NinerBikes NinerBikes is offline
 
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Location: Granada Hills
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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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  #5  
Old 09-16-2019, 04:51 PM
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Piper J3 Piper J3 is offline
 
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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.
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  #6  
Old 09-16-2019, 08:19 PM
Tacco Tacco is offline
 
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I canít find any requirement in the PAP to raise the nose for fuel testing.
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  #7  
Old 09-17-2019, 12:18 AM
rvbuilder2002 rvbuilder2002 is offline
 
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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.
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Last edited by rvbuilder2002 : 09-17-2019 at 12:20 AM.
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