Horsepower
1 hp = 36 lb-in. @ 1750 rpm
1 hp = 3 lb-ft. @ 1750 rpm
hp = Torque (lb-in.) x rpm
63,025
hp = Force (lb) x Velocity (ft/min.)
33,000
Velocity
Velocity (ft/min.) = 0.262 x Dia. (in.) x rpm
Torque
Torque (lb-in.) = Force (lb) x Radius (in.)
Torque (lb-in.) = hp x 63,025
rpm
Mechanical Efficiency
Mechanical Efficiency =Output hp
input hp x100
Output
Output hp =OT (lb-in.) x Output rpm
63,025
OT = Input Torque x Ration x Efficiency
OT = Output Torque
Output rpm = Input rpm
Ratio
OHL
OHL =2 TK
D
OHL = Overhung Load (lb)
T = Shaft Torque (lb-in.)
D = PD of sprocket, Pinion or Pully (in.)
K = Overhung Load Factor
OHL Factors
Sprocket or Timing Belt ............. 1.00
Pinion & Gear Drive.................... 1.25
Pully & V-Belt Drive.................... 1.50
Variable Pitch Pulley................... 3.50
Misc.
kW = hp x 0.7457
in. = mm/25.4
