uniflo engine

uniflo steam or compressed air engine might be the simplest engine to make because of only one moving part in the engine. was thinking of using a peice of wood in a metal pipe for this coated with teflon or using metal rings as guides and wear preventers or a couple glass marbles.

if reinforced 2l pop bottles are used 1300 psi can be achieved rather than the standard 150.

if the compressed air rc market was to be a thing like airhogs then maybe this would be something to consider using.

http://www.spudfiles.com/pneumatic-cannons/topic23098-15.html

i dont recall the original author of this drawing but if i happen to find it i'll post it here.