ORIGINAL: gunnarjohn
I have a 15 tooth pinion on it now and it is way to high of a head speed. The main gear on the blade is 145 tooth I believe the motor is a 3550kv outrunner and I am running a new 3 cell lipo.
i think you are going to have about 4000 rpm or more with that pinion.
which i seriously doubt the head or blades can handle that speed
thats actually pretty dangerous,i would keep my head low when flying that heli, parts may just become projectile`s.
if i remember correctly the stock head is rate up 3200 rpm max.
the stock motor is 3800 kv with a 10 tooth pinion.
with a 3550kv motor i would say a 12 tooth pinion would be optimal gear to rpm match. this will keep the motor at 80% throttle effecience. which means not taxing the esc or head parts