Came down with a cold so I only tested the fuel tank today. It has been sitting for a week.
Initially tried the setup in the plans but had leaks around the filler neck and where the balloon was attached.
So went to Lowes' for some fittings and a short nipple. With the fittings and the rubber coupling (supplied by Van's), was able to attach the balloon to the large fuel inlet. Initially the balloon leaked here also, but, corrected it by first attaching the balloon, then put a few wraps of teflon tape over the balloon (to protect it), then tightened a small hose clamp over the teflon tape and balloon. Capped the fuel outlet/strainer and attached the air chuck to the fuel return line fitting.
When I went to the grocery store for a few balloons, found out that there is a cheap grade and a helium tight grade!!!!
Going to have to do something with the strainer. It only went into the fitting on the bottom of tank about 1 1/2 to 2 turns. NOT far enough! Will have to fix.
Link to VA-210 Fitting Issue on Van's Website
Remember your high school physics. PV = nRT. Barometric pressure changes and temperature changes WILL change the shape of the balloon!!! After 4 hours, IT IS HOLDING!!!
Time Today - 1 hour
