Single Cylinder Oscillating Steam Engine

This Steam Engine has been designed as a Christmas present / Project for Pops. I have built 5 of them and each time i have refined the design. The version that I have made available will run on 5psi of air when time is taken to bed every thing correctly.

"Pops if you get crankey and brake a bit, don't stress I can print another part and send it to you"

I have included all 123d design files. stls and instructions to build it.

Paul