[Ether]

Originally Posted by Andy Baker

Tested at 12.8 volts
23 ft-lbf max torque at stall
28.6 amps pulled at stall
Estimated 350 watts of power

The numbers don't seem to add up. Using the 84 rpm free speed from the AM web site:

At 12 volts:

stall torque = (12/12.8)*23 = 21.56 ft-lbf

Assuming max output power occurs at half stall torque and half free speed:

half stall torque = 21.56/2 = 10.78 ft-lbf

half free speed = 84/2 = 42 rpm

max watts = 42*10.78*0.142 = 64.3 watts

At 12.8 volts:

free speed = (12.8/12)*84 = 89.6 rpm

Assuming max output power occurs at half stall torque and half free speed:

half free speed = 89.6/2 = 44.8 rpm

half stall torque = 23/2 = 11.5 ft-lbf

max watts = 44.8*11.5*0.142 = 73.2 watts