Oh I do Know that Dave, I guess I'm just trying to convince myself that my only other engine (a Rabbit 100 in my Elan)) will be a good alternative, I love the speed and power of the Cheetah, but that one needs major repairs from the crash. I still have to figure out why it flew away . I'm sending the radio and whats left or the on board equipment (servos /reciever) back to have it checked out. Thanks JAck.