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07-24-2011, 09:39 PM
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Join Date: May 2011
Location: Arlington, Texas
Posts: 11
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Moeller Fuel Gage Install
I have a question about the RV-12 fuel tanks with a Moeller Fuel Gage installed. Did you use a back-up plate on the inside of the tank to hold the nutplates and to distribute the load? Also, did you use the supplied gasket material or use some of the pro-seal to close-out the installation? I will be installing a blanking plate until after the final inspection. Thanks in advance for your advice.
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07-24-2011, 11:21 PM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Just did the same thing you are doing - incorporating the gauge while building the tank. I asked my EAA tech adviser about that. Considering the small diameter of the hole, the light weight of the gauge and the flange itself on the gauge, we decided no backing plate was needed. I intend to use the gasket with the cover plate and proseal the actual gauge installation (~10 minutes after the inspection...).
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07-25-2011, 12:50 AM
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Join Date: Mar 2009
Location: Netherlands
Posts: 663
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I used a back-up plate (.063") (and trimmed it to 1" around the opening) and proseal to install the gauge.
Fuel Tank

Last edited by Gagarin737 : 07-25-2011 at 01:13 PM.
Reason: extra picture
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07-25-2011, 06:03 AM
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Join Date: Mar 2009
Location: Austin, Texas
Posts: 306
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I did what gagarin737 did, starting with the tank access cover plate as he did, but I trimmed it down to a circle centered on the gauge, about two inches in diameter larger than the diameter of the outside of the gauge, held in place with nutplate rivets and some devil's snot (sealant).
http://www.mykitlog.com/users/displa...g=128590&row=1
__________________
Rob Reese
RV-12 #120332 N73HR
Austin, TX
TangoFlight Mentor
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07-25-2011, 06:29 AM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
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This is how I did it originally - -
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07-29-2011, 06:34 PM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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I did not make a backing plate for mine, however it is probably a good idea.
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07-31-2011, 05:55 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Hydraulic pressure
One thing to consider is the hydraulic pressure in a crash. If the plane flips upside down with full fuel, there will be a tremendous pressure exerted against the top of the tank. If the fuel weighs 120 pounds and the force of the impact is 20 Gs, then there is 2400 pounds pressing against the top of the tank trying to stretch the tank skin. A reinforcing ring will help.
Joe Gores
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07-31-2011, 03:38 PM
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Join Date: Sep 2006
Location: Webster, NY
Posts: 91
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Prefabbed tank with Moeller gauge
Has anyone installed a Moeller fuel gauge in a prebuilt tank? Thinking of a way to add one to mine.
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08-01-2011, 04:53 AM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Joe, I agree with the calculation, but at 20g deceleration from an inverted position, the pilot will have lost all interest in the integrity of the Moeller gauge and the tank
Quote:
Originally Posted by Mich48041
One thing to consider is the hydraulic pressure in a crash. If the plane flips upside down with full fuel, there will be a tremendous pressure exerted against the top of the tank. If the fuel weighs 120 pounds and the force of the impact is 20 Gs, then there is 2400 pounds pressing against the top of the tank trying to stretch the tank skin. A reinforcing ring will help.
Joe Gores
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__________________
rgmwa
RV-12LR 912ULS
120346
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