eddvick

Not as vulnerable as you might think--some of the test models were flown with bullet holes for extended periods to verify that they could withstand small-arms fire. The main problem was the design of the plane--not as stable as the Reluctant Phoenix http://www.humanpoweredflying.propdesigner.co.uk/html/reluctanflights.html or Frederick To's later Phoenix http://www.humanpoweredflying.propdesigner.co.uk/html/phoenixthe_gossamers_and_other_planes.html (which I wish I could afford to duplicate since it was a simple, low-cost design and I have his papers on wing construction), but a lot faster. An Inflatoplane pilot was killed in a freak accident during testing and since you could get a chopper in faster than you could get the plane dropped in a canister and inflated the project was killed. The basic Goodyear "aeromat" construction method was sound, especially if it had been done as a flying wing instead of being stuck on an inflatable mutant bastard Piper Cub fuselage.

Edited at 2012-07-11 10:09 pm (UTC)

Then there is MOOSE

http://www.astronautix.com/craft/moose.htm

Man Out Of Space; Easiest.