Kirknik:

I have tried 3 different props. I don't have RPM data, but I have measured static thrust.
The APC 13X9 prop will pull 10.2lbs. static thrust.
The APC 14X6 prop will pull 9.6lbs. static thrust.
The APC 15X6 prop will pull 9.2lbs. static thrust.
The 13X9 will give you faster rev's and more overall speed, but does not give much braking, i.e. faster landings. It also will not idle very low.
The 15X6 is slow to rev and gives to much braking.
The 14X6 seems to be the best overall prop for the flying that I do, i.e. good idle,good power and good performance.