one of my flying buddies put a super tigre .45 on a avistar and claims its well overpowered and really too much for the plane at full throttle. i have a avistar with a old enya .40 bb on it and it really hauls it around!!...but the avistar is a .40 size plane. if the tower trainer is .60 size a 46 will fly it easily if it has a flat bottom wing