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-   -   Windmill brake. (http://www.diychatroom.com/f97/windmill-brake-164729/)

NiNe O 11-26-2012 06:20 AM

Windmill brake.
 
I am building a windmill to aerate my pond. I have a blade from a thousand ton cooling tower, I took a air pump from an old school building and will link them together with a set of pulleys and a belt. My problem is when we get gusts of wind in 50's I don't to have to find pieces of my windmill in the neighbors yard. So I need a brake on it to prevent from spinning out of control. I have looked around and haven't really come up with anything.

oh'mike 11-26-2012 07:52 AM

I know nothing about this other than the name of the part you need--centrifugal brake - Google Search

Good luck----

shazapple 11-26-2012 09:00 AM

You could try a Furling system (I had to look up the name, so don't take me as an expert). The turbine is essentially mounted on a hinge with a spring and when the wind blows too hard the turbine rotates out of the wind and slows down.

curtd 05-04-2014 07:04 PM

What a cool project. Some pics after you build it maybe ?:) Oh'Mike's idea reminded me of my mini bike. May be you can use a clutch. It works on centrifigual force

joecaption 05-04-2014 07:29 PM

Check out the Mother Earth News website.
There all about being off the grid.

Oso954 08-09-2014 12:32 PM

I would suggest going to Fieldlines.com which is the discussion forum for Otherpower.com. They have some real wind experts there.

I hope you have a good blade set. Some cooling tower blades make a decent windmill. Others do not.

Bud Cline 08-10-2014 01:11 AM

Before you go "off-grid" VOTE in the Project of the Month contest here at DIY Chatroom.

PaulBob 08-10-2014 09:09 PM

Quote:

Originally Posted by shazapple (Post 1060656)
You could try a Furling system (I had to look up the name, so don't take me as an expert). The turbine is essentially mounted on a hinge with a spring and when the wind blows too hard the turbine rotates out of the wind and slows down.

+1 on the furling system.. By far the best way to go...

52Caddy 11-13-2014 08:02 AM

Yeah, the furling system sounds about the easiest. I don't know if you could rig up a brake that would last long to keep that slowed down.
The only other way would be to get rid of the lift created by the blades, I think that's typically done by rotating the blades on big units, but I doubt you have that option off a cooling tower fan.
How about a governor system that would slide out on the blades as the centripetal force increases from the increased speed. As they slide out it would cover up the blade and change the shape of the airfoil to reduce lift, thereby slowing down the rotation?
Sounds good in theory, but I have no idea how you could accomplish that at home!


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