The Admiral GP26 on a 10s. I've used this motor on my 110" Rascal knock off from VH. It flies it very well @ 17lbs AUW @ 1/2 throttle for lazy flying & never opened it up. I did not expect my Cub to weigh the same, so I am not sure how well it will do for Aerobatics. For a 15lb bird, it would definitely perform well.