I just tried out a balloon tank today, since I'm just not getting joy with trying to make a Golden Bee tank work inverted (I know: this should work. I may start a thread on it).
As far as the "works at any attitude" it's great, but I have some questions.
I "mounted" the tank by making a cylinder of acetate about 1" in diameter, and nailing it down to the plane wing with a bit of plywood to spread the forces, and a pair of #2 screws. My problems with this are twofold, with both filling and holding the tank in position.
In filling, I need to disconnect the fuel tube from the tank inlet tube, but everything is squirmy and not nailed down (and now it's all fuel soaked, to boot).
In flight, the tank just extends through my (hollow) tube and flaps out the back. I think this latter problem can either be fixed by putting a back onto my tank mount, or by ignoring the problem, but it'd be nice to have things nailed down.
So -- how to do this? I know that Ray uses 35mm film cannisters. That's just exceedingly cool, but I didn't save mine and they're kind of rare. I'm thinking of doing something like soldering a brass strap onto a bit of fuel tubing, to be held down by one of the engine mounting screws or by a screw to the airframe.
Does my method make sense?
Is there an easier way?
Thanks.