Thanks agin for the speedy replies .....My main goal is to fly this craft with only one battery , given the limited resources where i live ...so i really want to keep the magneto and fly-wheel ,however i will try to source a smaller engine ....as for the echo engines : non-existant where i live ....in reality the smallest engine i may get away with  is a 20cc weadeater feather-lite ......has anyone tried this modification on the aircraft in question ? (CMP T-34MENTOR)....THANKS.