# FBD of an aerogenerator (Windmill)

• Andres Padilla

## Homework Statement

Good afternoon, I hope someone could help me with this problem, it is killing my head. I have an aerogenerator, I already find the torque excerted by the air (75.8N) and the force transmitted by the gear (1010.6N). The problem comes when I try to draw the free body diagram to find the reaction force (I uploaded the real picture of the aerogenerator so that you can see how it is supported. Also I uploaded my attemp of solution.
I think it is only supported by one support (Point C).

Tnet=0
Fnet= 0

## The Attempt at a Solution

Since I only have the downward force (1010.6N), the reaction in C will be 1010.6N.
When I draw the flector diagram, it seems that I am forgetting a force or moment in somewhere. I am currently thinkink that I must include a moment reaction in the support C. Or maybe, I must add a force reaction just in the propeller (I meant, maybe I have to add a unknown force in point A)

What do you think it is the problem? Because the diagram flector must close.

note: I am only making the FBD of the shaft 1

#### Attachments

• 33f383a1-f42b-4241-a830-b945d1171a28.jpg
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• WhatsApp Image 2018-07-05 at 1.38.02 PM.jpeg
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What do you think it is the problem?
As the diagram is drawn, with only support at C, there is a net z torque. It would be more usual to have supports each side of B, and close to it.

Looking at the photo (in the area that corresponds to point C on the drawing) there is a tube with the shaft in it. Are there two bearings one each end of the tube?

Torque should be expressed in Newton-metres.