Hi Bob,
I have the SS muffler, so I was not planning to clip any of them for the SJ50 unless the higher pitches like the 9.25 seemed to be a bit much of a load. But for the SS muffler maybe not, right? Darn it I should have bought the other muffler, but oh well.
Based on the .50V1 prop recommendations I was going to look at the 8.75/9/9.25 range clipped down to around 8" on the stock pipe length for that motor. I chickened out on running APC 8" sport props despite the fact that many people seem to be doing so. Now I have a collection of those with no purpose..
MJD