I run the os 32 on my skyray and it puts it almost at the speed limit. It is just on suction with a standard(regular) tank. sig 10% 1/2 cas. 1/2 syn, Master Airscrew 9-6, and the needle valve assy works better when it is actually mounted on the back plate. I think that the OS could be a really good engine with some more nitro and a better prop. As for the webra I just bought my first one not to long ago and with what little experience I have with it it seems to possibly be comparableto the OS. Im working on a tigercat for class II to put them both in. Good luck!
David