# Rotating Shafts and Torques

## Torsional moments acting on rotating shafts

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

T = P_{hp}33000 12 / (2 π w)

= 63057 P_{hp}/ n (1)

where

T = torque - or moment (lb in)

P_{hp}= 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)*

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