I have one of these waiting to be put together, but two memebers of the club I belong to have one. One of them has a Saito .90 three blade and the other has a saito .100 three blade. The saito .90 behaves better than the 100 and is more scale like in flight at half throttle. The 100 is just too much power and makes the Corsair hard to fly. It is too sqirrely on the ground and in the air. A few of our members believe it is due to the small rudder and too much engine.