Jeff - I know you're just picking - BUT Why not, I've witnessed it. I'm flying a YS110 on my ExplorerV90 turning a 15X10 on 30% all synthetic fuel around 8900 -9100RPM. My Mentor is running the OS91FX turning a 15.5X12 4blade prop with the same fuel around 7800-8000RPM on his Express 2-M . My YS can't turn a 15.5X12 4 blade prop. He gave me a 14.5X11 4blade prop and I'm gonna have to shorten it some to turn it. He has OOS vertical and no power issues with the FAI prelim or final sequence

I hate to see people saying they're running a 13X8 at 11,000+ and looking for more power. They just don't know where the available power curve is for this motor(os). Of course they've not done all the testing to "find" all the power either. He has. Been running that motor in his 2meter FAI & 3-D planes for at least 4 years(maybe more but I don't want to say something I'm not sure of)

If anyone saw the article in 3-Dflyer magazine about George Hicks, he had a picture of Nat with his 2meter 3-D Express powered by the OS91FX. I don't think George would've ignored an underpowered situation. He sure didn't have any power issues when he flew it.


Eddie