RE: Small diameter props and large spinners
Terry,
I ran Jett .50 and spitfire (kyosho) at our warbird races for a couple of years. The only plane that was faster was a WM Mustange with an OS. .91 FX and Ultrathrust muffler.
I tried all of the props, and the best combo I came up with was a standard APC 10x7 sport prop.