Ditto all of the above.

Don't be afraid to run as large of prop as a 19x10 Mejlik or 18.1x10 W APC once it is broken in. I think there is a APC 18.5x9.5 available now also. Mike Harrison has been using one. With a long enough pipe setting it will run fine, will turn about 75-7800 RPms on the ground. the Mejlik is lighter then a APC but a tad more pricey.

Wayne Galligan