First time posting, and I appreciate any replies. I've had a couple thoughts about building a small go-kart powered by a pneumatic motor. Please join me on a vision quest as I explain a few thoughts, and ask for advice: Assumption: 1 person through pedal power can exert between 100-300 watts of energy continuously. This roughly equates to 0.13 - 0.4 horsepower. Would it be possible to equate this horsepower, through the use of a bicycle type set up, to turn an air compressor pump enough to fill an accumulation tank to force enough psi at such a rate to a pneumatic engine to provide forward motion continuously? I know there's a lot of variables, and I'm talking with an engineer buddy of mine about it too. Sadly I don't know enough about physics and the laws of thermodynamics to do this kind of thing on my own. Ultimately, the Kart I would like to build would be a two-seater with the bicycle/pump on the passenger's side to allow one to compress while the other drives. Perhaps even incorporating a hand crank on the driver's side to assist with the needed torque to overcome the gearing necessary to get up adequate RPMs for the compressor. I just really don't know. I'm sorry, I know this is a wild hair-brained idea, and I'm really swinging for the fences here. But I figured if anyone could give me adequate advice, it would come out of this forum. Thanks!