How to calculate torque on a shaft?

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To calculate torque on a shaft, the power produced by the turbine can be divided by the angular velocity of the rotor, which is derived from the RPM measurement. The combined weight of the turbine blade and shaft, along with the radius of the turbine blade, can also factor into the calculations. Understanding these parameters allows for a basic estimation of torque. Accurate torque calculations are essential for selecting the appropriate compressor for the turbine system. Properly determining torque ensures optimal performance and efficiency in the application.
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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?
 
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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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