There is a
HUGE difference in power output between a Feigao 540XL and the KB45XL . Just out of curiosity I bench tested a KB45/10T spinning a 14/6 aircraft prop , you may not see it in the video but it turned that prop with as much ferocity as a 60size nitro motor
http://www.youtube.com/watch?v=wqN4fsWxKrU