RE: propane weedeater engines in planes?
Being that the engine is a 26cc 4s, I would be curious about how much power it has. It may not be very power efficient. I'm also curious about how much the fuel canister weighs. To be safe, I imagine the walls have to be sufficiently thick, but with most gassers, you are already hauling about 16 oz of fuel up with you.
Try it and let us know how it works. Try not to set anything on fire.
Curtis