4.5 inch dia aluminum hub and carbon fiber spinner. CNC machined aluminum hub and blade holders matched to the backplate. The blade holders have a feature to screw in pivot balls for linkages to adjust the pitch in flight or mixed with the throttle. Can be adjusted to go into beta or negative pitch. The hardware is high grade and engineered for the application. The blade holders run on dual ball bearings and thrust bearing in each part, 10 ball bearings and 5 thrust bearings in all. Precision ground grade 8 shoulder bolts. The blades I was going to test with are APC 14W x 4 and are cut to fit exactly in each blade holder.
Pretty cool project I just ran out of steam for it and it has been boxed up for many years. I spent a lot of money on this project, it's all original and one of a kind. Looking for someone that understands this and wants to pick it up and finish it. I'm selling it for 1/3 of what I've invested in it.