# Rotating Shafts and Torques

## Torsional moments acting on rotating shafts

A torsional moment or torque acting on a rotating shaft can be expressed as

T = Php 33000 12 / (2 π w)

= 63057 Php / n                            (1)

where

T = torque - or moment (lb in)

Php = horsepower (hp)

n = revolution per minute (rpm)

• 1 hp (English horse power) = 745.7 W
• 1 lb in = 0.113 Nm

#### Example - Car Engine Torque vs. Power and RPM

A car combustion engine deliveres 100 hp at 5000 rpm to the shaft. The torque in the shaft can be calculated as

T = 63057 (100 hp) / (5000 rpm)

= 12611 lb in

= 143 Nm

### Torque vs. Power and Revolutions Calculator

Power (hp)

Revolution speed (rpm)

## Related Topics

• Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more

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