ORIGINAL: quepasa
I do not believe that a .91 swinging a 13x6 @ 10 grand has anymore thrust than a .65 would on the same prop at the same rpm. The difference on a 13x6 could only be due to the ability of the .91 to turn that 13x6 FASTER, or the .91's ability to turn a bigger prop ( which would be good on a slow airframe) at the same rpm.
QuePasa,
You can say that again and again and again.
It is pure truth, but some find it hard to swallow...or to understand.