Engineers Edge Electric Motor Solid Cylinder Rotating About Own Axis Torque, Force Equation and Calculator - Engineers Edge
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Electric Motor Hollow Cylinder Rotating About Own Axis Torque, Force Equation and Calculator
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To determine a fan or blowers horsepower when driving a hollow cylinder/shaft use the following equation. 


Hollow Cylinder

Equation:  

        and          Open Calculator

Where:

T =   Required Torque, lb-ft
WK2 =   Inertia of load to be accelerated  lb-ft2
(See moment of inertia calculations)
Change of speed, rpm
t =  Time to accelerate the load, seconds
W = Weight of object, lb
R1 = Outside Radius of cylinder, ft
R2 = Inside Radius of cylinder, ft

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