Ken, It isn't full scale yet. It is about 40% scale and I choose this size because of the problems with the first models. I found the the rotor blades in the first models acted differently from a full scale gyro. It took me a year and a half to find this out. I found that the blade reflex on models needs to have a down reflex. I think it's due to the rigidity of the blade longitudinally. Small models have light weight balsa or basswood blades. When rotating it noses up in the relative wind and needs a down reflex at the trailing edge to compensate. I'm hoping that the 40% scale I can use a more rigid material in the blades to see if my hypothesis is correct. I certainly appreciate your kind offer to machine some of the parts and I may take you up on it. I'll need to cast more parts before committing to any help. I need to calculate the metal shrinkage for my parts which has come out smaller than the needed parts.