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Head Speed calc
 (Kv x V x .9 x P) / Mg = head speed

Kv  =   Kv rating of motor
V    =    battery voltage
.9   =   90% efficiency
P   =   Pinion Gear
Mg   =  Main Gear

Example:    for a T-Rex 600 electric
Kv  = 1600
V    = 22.2
.9   =   90% efficiency
P    = 12
Mg  = 170
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