I indeed have seen a PT6...
I do know that it is a free shaft turbine and want to use it to drive the rear wheel of said motorcycle. This project is in its' early design stage, and we, the team, know that there are considerable physical and technical questions that we need to answer prior to any full scale building taking place. Not the least of these questions is in fact the torsional stability issue. We are examining several ways to counteract that force without inducing more stress to the frame of the vehicle. Another of the technical considerations is this, can we use bundled carbon fiber/kevlar rods in place of some esoteric metallic alloy of the same or similar strength to weight ratio? So, as you can see, this is not some crackpot throw it together and drive it until it kills me idea. I do want very much to survive my encounter with Bonneville and , hopefully, the record books