NINO My engine setup came from a RC10 GT car. It is a OS 12 CV and I think the clutch is from Associated as Peter D. has stated. I did have to make a shaft to adapt the clutch to the engine. I would like to see what others have done for the clutch shaft. Also had to make a longer main rotor mast. The whole thing came out a little tail heavy so when I fly it , I keep breaking the stock tail gear housing. I do have one of the CHOPPER-1 gear boxes but I am going to make a drawing of it before I install it in case I can find someone to make another one. Like Peter D, I would like to see pics of what you do as well as anyone else who is doing this.