that does it !! I`m adding a tower 75 to my wishlist on the towerhobbies websites. I`m currently flying my harrier 46 on the asp xls 52, and it performes great. I get 13700 on the asp 12,25-3,75, but if I could swing that prop at 15000 it would be even better, right?? Power out of trouble down low is what counts