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  #11  
Old 12-29-2018, 02:18 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
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Bob, this is something we need to verify in your 2015 RV-12. Very valuable thread, thanks to all that have contributed.
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  #12  
Old 12-31-2018, 10:41 AM
AirHound AirHound is offline
 
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Location: OFallon IL now, everywhere before
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Quote:
Originally Posted by Piper J3 View Post
I have four ways to determine fuel quantity before flight: Moeller, sight-gage on side of tank, Dynon D-180, and dip stick.

The only one I completely trust is the dip stick Ė very accurate / never liesÖ
Jim,
Did you make your dip stick? If so, any specs you can share?

Thanks and Happy New Year!
Doug
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  #13  
Old 12-31-2018, 10:47 AM
AirHound AirHound is offline
 
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Location: OFallon IL now, everywhere before
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Quote:
Originally Posted by rvbuilder2002 View Post
This is not a problem with the RV-12 (and not exclusive to the RV-12 either... all of the other RV models have gauges that can't read the upper 4 gallons or so because of wing dihedral). When is it that important to have a absolute gauge indication of the first 3 or 4 gallons that get used. The important thing is for accuracy at that last 3 or 4 gallons. The RV-12 tank does well with this.

A long / full span skinny tank in the wing with the dihedral tilt will be effected even worse than any of the other RV's are.
Scott,
I didnít build my 2012 RV-12. Was wondering if the occasional strong fuel pump gas stream can neg impact fuel tank floats/innards/accuracy?

Thanks and Happy Flying New Year!
Doug
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  #14  
Old 12-31-2018, 11:51 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by AirHound View Post
Scott,
I didnít build my 2012 RV-12. Was wondering if the occasional strong fuel pump gas stream can neg impact fuel tank floats/innards/accuracy?

Thanks and Happy Flying New Year!
Doug
I don't know if I understand your question correctly, but if you mean a high velocity stream from a fuel nozzle having a neg. effect on the fuel tank and sender? No, I am not aware of any problem caused by that. I don't see how it would be possible since the filler tube makes the fuel enter the tank pretty much straight down at the back of the tank but both of the fuel level floats are well fwd in the tank.
A change in fuel gauge accuracy is usually caused by an increase in resistance between airframe ground and the mounting flange (ground path) of the fuel level sender.
The RV-12iS redesign included adding a ground wire between the airframe and one of the sender mounting screws, to help mitigate this problem.
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Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #15  
Old 12-31-2018, 12:57 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Quote:
Originally Posted by AirHound View Post
Jim,
Did you make your dip stick? If so, any specs you can share?
The stick is wood approx 1/8" x 3/8" x 36". The end that gets inserted into the tank is pointed so it can sneak around the fuel return tube at the base of the filler neck. Start with empty tank and fill with 2 gallon increments each time inserting the stick and marking the level with a graphite pencil. Dead nuts...
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Jim Stricker
Hinckley, Ohio
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC Jul 2012 - Bought Flying Oct 2015 with 48TT - Hobbs now 406

LSRM-A Certificate 2016
Special Thanks to EJ Trucks
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  #16  
Old 12-31-2018, 08:00 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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I did what Jim did and used flexible translucent tubing. Although the shape of the tank isnít a uniform cube I found that once youíre past the sloped tank floor it was pretty much one gallon to the inch. I got 20 gal into my tank, but that filled most of the filler neck so as soon as the fuel started filling the neck the linearity shifted. Iíll check my dimensions on the marks when Iím at the hangar on Wednesday and post them.
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