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Forum Index : Windmills : Built a little Miller rotor windmill.

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Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 11:52am 15 Jul 2007
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Hi all.

I put together a small Miller Rotor as described by RonS. I stuck with the 1.6:1 ratio for diameter and chord, and my wings were 200mm long. Its driving a small stepper motor, but I'm realy just using the stepper motor as a ready made bearing. I stuck it on a post about 6 meters from my little Sandia Savious.




In the background you can see the Sandia. The Miller starts up OK, needs a little more wind than the sandia, but once its going it matches the sandia for speed. I think the Miller needs some more investigation, it appears to work OK and I would like to apply a small load to see how it performs.

Glenn
The best time to plant a tree was twenty years ago, the second best time is right now.
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vasi

Guru

Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 10:04pm 15 Jul 2007
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I am glad you doing this, because you already tested Lenz and you ca tell us about both turbines. I vote with Lenz but Miller rotor can be a pleasant surprise.

You newer scaled Sandia ... Edited by vasi 2007-07-17
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Dubyagee
Newbie

Joined: 15/06/2007
Location: United States
Posts: 21
Posted: 01:39am 16 Jul 2007
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I too have made a Miller and its comparable to my savious. I'm having to rethink the blade support (It's balanced). It oscillates like crazy @ 200 - 400 rpms.
Regards,
Dubyagee
 
RonS
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Joined: 19/06/2007
Location: Australia
Posts: 18
Posted: 01:40pm 16 Jul 2007
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Great to see people trying the Miller. Glenn, you might like to experiment with putting the vanes closer together so that it starts in weaker airs.(But you will lose some torque, of course. )
Regards, RonS
Avoid strong drink. It makes you shoot at tax collectors ...and miss.
 
vawtman

Senior Member

Joined: 14/09/2006
Location: United States
Posts: 146
Posted: 10:11pm 17 Jul 2007
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Gizmo out of curiosity,

What is the vane shape of the Sandia sav.?

Never heard it mentioned before.

Have fun with your experimenting.

 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 12:19am 18 Jul 2007
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Hey Vawtman

Check out my photos page here, bottom left of page. There is a small video and the plans, I think I originally found them on fieldlines.
The sandia works very well, starts in the lightest of winds and spins faster than TSR 1, so must use a little lift as well as drag.

Glenn
The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ
 
Dubyagee
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Joined: 15/06/2007
Location: United States
Posts: 21
Posted: 10:09pm 21 Jul 2007
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Here is a huge PDF about wind tunnel testing two and three blade Savonius mills.

Click here Edited by Dubyagee 2007-07-23
Regards,
Dubyagee
 
vawtman

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Joined: 14/09/2006
Location: United States
Posts: 146
Posted: 12:15pm 22 Jul 2007
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Thanks Gizmo

The problem with my early experiments with Miller type blades was probably related to the wide diameter i had them at.8ft x 8ft with 18in chord.

Would be cool to see video of the miller in action.
 
Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 11:53am 25 Jul 2007
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Hi Vawtman.

I took the Miller apart to try another design, but I will put the Miller back together, it really did perform well for its simple design. If I get it back together this weekend I'll take a short video.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
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