Oh yea I forgot to say that not to long ago I put a OS FA80 4 stroke in this bird and a 12-6 prop. well let me tell you the very instant that this bird becomes airborne if you have more than 1/2 power on IT make a 90 degree left hand turn and climbing out just a flat a take off as you have ever seen. If you advance the power slowly then it will stay on the runway just like a arrow.