How to calculate torque on a shaft?

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    Shaft Torque
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I have designed and built a steam powered turbine that I am trying to get to run a compressor. In order to choose a compressor I've been trying to calculate how much torque my turbine is producing. The only figures i have are...

RPM - found using a tachometer
Combined weight of turbine blade and shaft
Radius of turbine blade

Is there anyway to calculate the torque using these figures?
 
In a basic way you can take the power produced by the turbine and divide by the angular velocity of the rotor.
 

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