Comp Funfly
In the competition funfly arena, the webra .32 is unmatched for the power:weight. Mine turns a 10-4 props almost 18k for almost 9 pounds of thrust.
All depends what you are looking for I guess, power:weight ratio, RPM, speed, transition, torque. The webra .50 is a good all around IMHO, I don't think I've touched the needle valve on mine in 4 years, running same fuel and prop, but still. YS is good when they are working but when they are not working? they are not working. O.S. is good, reliable, consistent and good power. Just my $.02. I had one MVVS, I will not own another. I own several rossis', another good powerplant, but technology is passing them by(enough of the heavy case already). I currently own a Jett .30 and .35, good motors, we'll see how long they last. Another good-not-so-much-heard-about-engine? HP .40 Gold Cup....power to weight is nuts.