Head speed

[Shark Attack]

Hi, after toasting my ys91st and putting in a new 91sr, I also bought a gv1 govener. the heli is a fury exstream. What head speed should I run??? I forget my gear ratio and I know this needs to be known to set up the gv1, but regardless the gear ratio i should want to run the same head speed, no?

thanks
Kyle

[WayneBrown]

count the teeth on the main gear, 8:45 (YS) is a 90 tooth gear. 8:18 (OS) is a 91 tooth gear.

[DavidH]

You want to run the motor in the power band. The YS 90 ST seemed to like to run in the 15.5K to just beyond 16K.

As the YS 91 SR is a long stroke engine, I am not sure what RPM range the power band will be.

David