I have a brand new YS 91 FZ. It will fly on an 8 pound fun fly. Can I fly a 16 inch prop? Most people like this motor with a 15, but for a large fun fly, a bigger diameter is usually better. How big is too big? I'll fly Wildcat 20/20 fuel and I'm at about 600 ft above sea level.

I was thinking a Top Flite Power Point 16x6 or maybe even a Bambula. I assume that a lighter wood prop would help transition a bit.

Thanks,

Any prop which will turn in the 9000 rpm range will work fine. Lighter weight, the better. Careful that you don't get something so wimpy that it comes apart though.

Dave

I thought I was shooting for 9,500 to 10,000? It seems like a 16x6 should easily get to 9,000. What props are the ones coming apart? I'd probably start with a Top Filte PP because they are at my LHS. If that one does OK, then I may order tha Bambula or maybe a BY&O.

You can go a little above the 9000 mark, but try to keep it under 10000.