why do hp and tq always cross at 5,250rpm?
01-12-2006, 10:36 AM
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Because with the conversion factors included (lb.ft. and hp), power is torque*rpm/5252...
Torque = radius*force
Power = Energy/time = 2*pi*radius*rpm*force
Thus
Power = 2*pi*torque*rpm
In metric units, the left hand side is Nm/min while torque is Nm.
1 Nm/min = 0.00002235 hp
1 Nm = 0.737562147 lb.ft.
So
Power(hp) = torque(lb.ft.)*rpm*(2*3.141592654/0.737562147*0.00002235)
Or
Power(hp) = torque(lb.ft.)*rpm/5252
Power = Energy/time = 2*pi*radius*rpm*force
Thus
Power = 2*pi*torque*rpm
In metric units, the left hand side is Nm/min while torque is Nm.
1 Nm/min = 0.00002235 hp
1 Nm = 0.737562147 lb.ft.
So
Power(hp) = torque(lb.ft.)*rpm*(2*3.141592654/0.737562147*0.00002235)
Or
Power(hp) = torque(lb.ft.)*rpm/5252
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