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The Tirajator

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instead of a weathercock -
a Tirajator-weatherpegasus!


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(topview; northern hemisphere)

With the new Sjoelltake Windmill I searched for patronizer in 2005. Still it was not clear which angles are best at the Sjoelltake, so I need some capital to construct a more stable model out of metal. Because nowadays the patent law has not the originally meaning to protect little inventors any more I had to keep the cat in the bag. Therefore I tinkered little Chinese Windmills out of cottonwood that I gave away because the attempt to sell them would cost too much time and I still had to find out the optimal angles for the Chinese Windmill. So I could bring art, advertising and science under one hat at coeval low costs.

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Tirajator video
A paperboard-Tirajator in action

I tinkered many models and found out, that the folding angle is very important. So I had the question what would happen if the folding angle is 0°. If it will turn round when the wind is caught in the middle? I constructed a paperbord model out of old cardboard boxes for rice and surprise: it turns amazingly good!

I built it that way that I could turn it upside down because I supposed that the rolling direction could be important because of the Coriolis force. Fastly I glued many models with different angles of the lamella and compared them. So I found out, that in the idle state an angle of about 25° and a sheath-number of 0.8 may be optimal. It was seeable that the "Chinese without folding angle with lids" turns better in the mathematical rolling direction on the northern hemisphere. The sheath-number has the advantage to have no dimension and that it is independent of the radius and the count of the lamella.

Still to be optimized parameters:
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angle of the lamella α and the sheath-number β = δ/ε  

Still to do:
A prototype with lots of lamella has to be built to get the measured values. The more lamella the Tirajator has got the more marginal a curvature of the lamella becomes. You can optimize a curvature only after knowing the values of a curvature zero. And then the dependency of the latitude circle has to be proven.
After getting the values of the standard Tirajator you can experiment with it: e.g. a curvature of the lamella, slits within the lamella (a higher buoyancy), a second ring with a different angle, different surfaces of the lamella: above slick, under it rough, the one lid with a funnel, the lid protruded, two sorts of lamella...
But please without advertising on it!!!

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The maximum of the leisure in dependency of both parameters must still be found.

(I guess that the maximum is at an angle of the lamella of 25° and at a sheath-number of 0.8. Then the Tirajator might has an efficiency of about 25-30%.)

One big advantage of the Tirajator is, that its request towards the flow of the wind is low. That mean even if the flow is not laminar but turbulent with many changes of the direction, the Tirajator delivers good energy.

As name I choosed the word "Tirajator" from creol "Ti" from "petit" for little, "ra" for radius and "tor" for maschine. The Tirajator is best as a small windmill up to 10 meters. I did not find any Tirajator in a book.

I participated in 2006 at the Rolex Awards 2008 and let the cat out of the bag because I thought that an international company like Rolex would be serious. A big mistake. I booked the prize already in my head because such a project do not even gets the best jury on the table every day. 2008 I received the refusal. 2009 I went into the internet for the first time and found much to my astonishment a video on YouTube from "GreenPowerScience" that does not only shows the Tirajator, too but also has the same structure like my application. Through the video leads a woman named "Denise Rojas" and in the Rolex Jury 2006 was a psychiatrist named Rojas from the private New York University, too.

I notified YouTube three times a copyright infringement because I could not find an address of "GreenPowerScience" but this company did not react. Therefore I sued YouTube. I lost the lawsuit of course because I missed to convince YouTube of a copyright infringement before the lawsuit! This solution is far easier and more lucrative for the "court".

I did not even get a reply of YouTube. After german law then there must be an missing-sentence ("Versäumnisurteil") for the disadvantage of the dumb side.

The video is clicked more than 1.2 million times. Now there are many copies of other people on YouTube as demanded in the Rolex plagiarism.

I searched further in the internet and found there the Hooper- and the Paasloo Windmill.

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Hoopers Windmill

Now I do not know whom belongs the honour to be the inventor of the Tirajator.

The Hooper and the Paasloo Windmills are similar but not equal. Both run in the wrong direction that reduces the efficiency factor very much. The Hooper Windmill has long lamella so hardly wind can come into in inner region of the windmill. But it is right not to let them make a "V" because this would lead to unwanted turbulences

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wicked - the wind do not like "jets" and runs around

Mr. Hooper took correctly a second (inner) ring with less lamella. But their angle is much flatter, the wind is led into the middle and not to circle round. Without the second ring the efficiency factor would be higher. Mr. Hooper would have saved material and he would be the inventor of the Tirajator.
Because of the low efficiency the windmill was removed quickly and Mr. Hooper improved the Dutch Windmill.

The technique became resurrected in Paasloo/Netherlands. Here they shortened the lamella by dropping the second ring.

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Paasloo Windmill

But the Paasloo Windmill has a oversized retainer in its middle. And there are no lids. As a result the wind just jumps out above and below. So there is hardly a stable whirl in its middle. And therefore the efficiency is humble, too. And the windmill was not further developed.

I do not know why the creators of both windmills did not tinker some little prototypes to look at and compared them to each other. Did they just want a Savonius rotor with lots of planes or something new?

Decisively for the question who is the inventor of the Tirajator is the question if there is a stable whirl inside the Hooper and Paasloo Windmill or not. This ought to be messured.

Always an air film sticks to the lamella. This film is pressed outside due to the turning. A low pressure area results in the middle like at the tornados. Because the air stream is compressible the Coriolis force has an huge effect. The molecules of the air turns also round and this very fast. Therefore the Coriolis force is not negligible. In some books about physics it is explained wrong.

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a Tirajator with the circa flow
There is a pick up of flowing lines.

I still do not know the optimal efficiency factor of the Tirajator. I guess it is about 30%. That is enough to make the Tirajator better than the Darrieus because of the low costs of the material for the Tirajator.

If a cylinder turns in a stream the Magnus effect emerges. To examine this effect on the Tirajator further prototypes are necessary.