I made the exhaust out of a piece of aluminum tubing and a flat aluminum plate, just welded them together with a propane torch (mapp gas actually) and an aluminum welding rod from home depot, I have no experience welding aluminum, but so far it's held. I'm sure the engine will burn 1/4 oz a min, but depending on how heavy your plane is, it may or may not fly at that power level. I have a 20 oz tank in it, and I have flown for a full 60 min, I do a lot of touch and goes, which saves gas, but then again the climbouts are at full power, so that averages about 1/3 oz per minute, and I didn't run it dry, there was some left, so I'd say it's possible.