thanks for the info the support center is closed for the week end so i have to go it alone so if you were to switch motors (because i am gona try it ) should i go with an in runner or the 450 out runner. the 400 i have is the 740 i just want to make sure i have enough thrust to go straight up for ever lol not sure which way to go with this. is the 890 rpm per volt enough.