Yep, with stock 6.6 gearbox, the 11x4.7 seems to work really well for low wieght airplanes. I have that similiar setup on my Eflite yak and its great power. i still use a 5.33 and park 400 on both my profile and full fuse ultimate. profile i use 10x4.7 and a 11 on the ultimate fx.