I can't even conceive a contra -rotating system, seems like an engineering marvel for a small turbine. I am guessing your using a radial flow turbine wheel-ala turbo charger type. Without giving up any trade secrets, how did you machine the tubine blade, again I presume Inconel or similar. AND, 32,000 rpm to get 40 lbs usable thrust, seems like you could use the cheapest bearings made. When are you going into production? What's your stock price going to be- I want some!