I have the Wm Miss America 40 size and absolutely love it. I installed at Saito .72 four stroke and have found the combination to be perfect for scale like sound and fly-bys. A guy at my field flies a dago red with a .91 and its speed is missile like. Definitely not or the intermediate flyer. I feel that the .72 Saito is perfect for having enough power to go vertical while still maintaining a reasonable flying speed. I have the rates set up so it rolls lightening fast. It still lands like a trainer.