Calculating Power Input for Wind Turbine Shaft with Continuous Force

[Tim Gard]

Homework Statement

I am trying to determine the input I will have on a shaft with a continuous force of 3,720 pounds one foot out from the shaft center.

I am thinking the input continuous torque would be 1 foot being that I am using a 2 foot pulley on the shaft, and I have a continuous 3,720 pound pull on this pulley ;

Homework Equations

The Attempt at a Solution

1 foot times 3720 pounds equals 3720 foot pounds.
How do I compute the power input into this? Is it simply converting 3720 foot pounds over a given time element? What time basis is used in wind turbine calcs?

 

[Disconnected]

What horrible units!
Please tell me you don't actually have to do assignments in imperial!

Please explain what you mean by the 2 foot pully. Is there a belt that moves within the trunk?

Do you mean a lever?

 

[SteamKing]

Now that you have the torque, you need to find out the rotational speed of the shaft in order to calculate power.

 

[Tim Gard]

two RPM

 

[SteamKing]

The formula for calculating horsepower is P = T N / 5252, where P is the power output in HP, T is the torque in lb-ft, and N is the shaft speed in RPM. 1 HP = 33000 ft-lb/min and 5252 = 33000 / (2 pi).