Hi I am not sure which model is the fastest in the air, however the Osmose slows down very quickly when you throttle it back for a snap or spin. As soon as work and the terrible UK summer permits I will be out at the field flying this model again. Iam sure its going to be a cracking model. One point on the covering. I have placed stickers of small bits of clear film over all the sharp points in the trim just to make sure they dont lift when cleaning the model. The build quality is good so the model should last. I am also using it to test some Futaba 2.4 GHz radio. I would rather crash this small model then a full 2 meter pattern plane or helicopter. So far the radio looks very good. I think it would be a good idea to soft mount a 4 stroke engine to save the airframe from the extra vibration these engines produce.