ORIGINAL: noahdear
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 !
The OS .40FP was the bottom end engine and it does lack power compared to others (so I have read). I believe this to be true because I had a supertiger .40 that had way more power. I think 11x5 is OK if you have the ground clearence or your run way is paved. I'm still running my FP .40 on an AeroStar .40 by MidWest. It's not much, but it flies good.