I hope it will punch out of a hover. I was going to put a st 90 in it but i read that the mid range is slugish and I wont be flying this airframe at full throttle with that big of an engine. So i settled with the st 75 hoping that fuel economy would be better.

St-75
Hp - 2.2 at 16,000rpm
Weight - 20.6 ounces w/o muffler.

55ax
Hp - 1.75 hp at 15,000 rpm
Weight 15 ounces ( I think ) w/o muffler.

Anyways more opinons are welcome.

Thanks,
Joe