|MadSci Network: Engineering|
“Dry”Air Rocket Has anyone built a “dry” compressed-air rocket ie. a compressed-air rocket that did not also require water? Was it any good? My understanding is that “compressed-air only” rockets tend not to fly too well as after the initial thrust spike the air pressure in the chamber falls sharply thereafter providing little sustained propulsion. I have an idea to get round this: Divide the pressure chamber into two parts separated by a piston or put a balloon into a sealed bottle. During the “charging” of the rocket, as air pumped into lower part of chamber (or the balloon) the piston must move upward (or balloon expand) until pressure in both compartments equalises. Then upon launch the air rushes out of the nozzle, the air in the upper chamber expands forcing the piston down (or collapsing the balloon) and thus maintains constant pressure at the nozzle during flight. Would it work ie. would it improve flight performance and make the rocket go higher?
Re: Is a 'dry' compressed -air rocket feasible?
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