just wanted to point out something about this airplane and using a 1.20 four stroke..............there was one at my field this last Sunday, it had an older style OS 1.20 on it. this engine powered this thing like it was a typical sport plane............had more than enough power even at 1/2 throttle.
i can't imagine why anyone would put a big gas motor on it and spoil the characteristics of the bird by adding all the extra wieght, not to mention the vibration.