| I don't seem to have the coordination to throw something flat and | level, so my attempts at glide testing have always had problems.
Sure you do. As suggested, try it with a cheap free-flight plane. The $3 foam planes at Wal Mart ought to be fine. | has anyone tried making a gadget that could launch a plane enough to do | glide tests?
If you're using a gadget, it's not really a proper glide test :)
| I was thinking like a high start but then realized that if | something didn't work well I'd have a long length of tubing dragging my | creation along the ground doing its best to re-kit said plane.
Well, a high start is pretty much the logical conclusion of what you're talking about ...
| I ask this in regard to a rocket boosted glider, but have realized in my | experience that my inability shows in other areas, and If I want to build a | frankenfoamy like bird, I am going to need to do some testing.
If you just need more flight time, stand at the top of a hill and throw it straight ahead -- and it doesn't have to be a hard throw. Preferably into the wind. If the wind is strong enough, you're slope soaring, and if your plane is properly trimmed and all, you can keep it up for a long time. (And of course, some of us love to fly like this.)