Winch Power Range Formula

Equation for calculate winch power range is,

PRw = [(LP × LS) / (C × Er)]

where:
LP = Line pull (lbs or Newtons)
LS = Line speed (ft/min or meters/sec)
C3 = A constant to convert to units of power (HP: 33000, Kw: 1000)
Er = Final drive ratio efficiency