RE: JC 60cc Engine
I don't know anyone that has the A to Z down on props...anyone. It's a murky science loaded with math, theory, and reality. Lots of young aero engineers with no history of actual flight put all their faith in theoretical designs just to have them blown out of the water in the tunnel or in actual practice. You come up with a starting point and refine, refine, refine from there. The process never ends. I have a lot of respect for Vess because he does it right and gets samples into the wind to see the practicality of a design. I may not agree with him but I definately respect his talent.