Beauty !!! thanks. I have a 10x7 on a Tigershark .46 and it seems ok.

The OS.40 FSR has a marine head and flywheel on it. I bought the 40FP to cannibalize for the head but it looks like the better (newer) engine, so I thought I might use it instead of converting the 40FSR back to an air screw. But the 40FSR seems to have much better compression. Is one better than the other, generally speaking?

They are saying over [link=http://www.rcuniverse.com/forum/m_6659566/anchors_6659767/mpage_1/key_/anchor/tm.htm#6659767]here[/link] that an 11x5 is good too. That gives me somewhere to start.

cheers !