prop size for YS45 tunned pipe

[plncrzy]

Have a YS 45 with header/tunned pipe and am mounting it in a F4 phnatom. We are at 2000' elevation and plan to run 25% nitro in it ... what prop do you think?????? 10X10? 11X11? 10X8? what?

[james]

One of the guys in the club in town used to fly a shrike 40 on the YS 45 with a 9x9 prop. It was a screamer and also extremly fast about 130-140 mph. I never saw the plane fly in person but have seen video of it. Hope this helps
James