Re: KRnet> Wing tank fittings

[Jeff Scott via KRnet]

To answer Brett's original question, I use welding flanges sold by Aircraft Spruce. AN867-1 for 1/8" NPT fittings, AN867-2 for 1/4" NPT fittings, and AN867-3 for 3/8" NPT fittings.  I drill numerous holes in the flanges to give the glass some "bite", then bed them in flox when installing. On <http://jeffsplanes.com/Cub/MOGAS/mogas.html> I have numerous photos of these during installation in the tanks in my SuperCub clone when I was rebuilding the fuel tanks following a MOGAS Meltdown.  There is also a lot of educational material on that page regarding other additives to Mogas and the damage they can do.  Following the rebuild of those tanks on the web site, I've had years of trouble free service from them since.

 

FWIW, I've had more issues with the Aluminum tanks in my RV than I have the Vinylester tanks in my Cub over the last few years.  I'll be pulling the aluminum tanks out for more work when I do the annual once again this year.  The aluminum tank issues appear to stem from sitting in the sun with full tanks.  The top skin surface expands more than the tank wall it is attached to and breaks the seal of the proseal along the upper edges of the tank, so my tanks tend to weep when full.

 

-Jeff Scott

Arkansas Ozarks

 

 

Sent: Friday, August 12, 2022 at 7:29 AM
From: "Brett Lombardi via KRnet" <krnet@list.krnet.org>
To: "KRnet" <krnet@list.krnet.org>
Cc: "Brett Lombardi" <blombard...@gmail.com>
Subject: KRnet> Wing tank fittings

I’m building a pair of fiberglass wing tanks and looking for the fuel tank fittings. Have searched Spruce, Wag, Amazon, Summit Racing, etc. with too many options. Anyone have specific advice on fittings/kits/attachments for fiberglass wing  tanks that they have used?

Thanks,

Brett Lombardi

N718KR 

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