Here are the parameters: * An inlet and exhaust that is threaded with some standard size fitting I can buy pieces for at the local hardware store. * It needs to hold high PSI, enough to get the RPM really high to say maybe 6,000 RPM or greater. * It needs to be fitted with a shaft. * It will need to be air tight. * Roughly 1.5 inches diameter * Hydro (water) powered I don't know if there is already a design out there? I'm curious if anyone knows how to engineer this not just to make it work but make it work as efficiently as possible. I'm looking forward to feedback from you the expert(s) Thx!