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CF = 0.000341 x pounds x feet x rpm^2
=889 pounds force.
  A simple formula for pounds/feet units/

Colin Smith

That is wonderful Colin Thanks.

Right up there with HP = T x RPM/5250 in simplicity.

Paul,
The simple formula by Colin Smith in metric is as follows:

0.010966 * mass in kg * radius in metre * rpm^2

0.010966 * .14665 kg * 0.0246 m * 10,000^2 = 3956 N, multiply that by

.22481 = 889.35 lbf

The constant 0.010966 is pi^2 / 900

Regards
Rolf Pfeiffer


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