Ball Piston Air Engine

This shows more work on a simple air powered engine that uses a ball shape for the piston.
Here is my steam engine build from 2014 that I used for the basic design on this new project: https://www.youtube.com/watch?v=cIYO-4upmi4
Here is a video by Bruce Yeany that shows the use of a ball for a simple air engine piston: https://www.youtube.com/watch?v=Cxf2jHJ9QWg&t=0s

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