I would think too much weight... having big heavy OS .91 Fourstroke in mine, it has plenty of power but I think its too heavy, no room to move the battery pack around without cutting into the rear of the fuselage so I had to put 2 ounces on the tail to make it a bit tail heavy, thus increasing weight instead of changing balance point. I just got a Funtana too and put a Saito .72 Fourstroke in that and it is awesomely light and powerful, even with 3 tanks through it the thing hovers at 1/2 throttle. I think I would like to try my .72 in the freestyle, I think that would be the perfect Saito/Freestyle combo.