ORIGINAL: Razor-RCU
MJD- The Weston manual actually states that the 9x6 or 9x7 are recommended for test flights...
Yeah I couldn't remember if it recommended the 9-7 or not. But considering the state of tune of the stock engine and pipe setup, I tend to think it would be happier on the 9-6. Mine runs like a Swiss watch on that prop, and is very easy to tune. That's all I was saying.
MJD