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Author Topic: Wind Power  (Read 12651 times)

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AGelbert

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Re: Wind Power
« Reply #255 on: June 17, 2018, 05:20:05 pm »
I have the two turbines I bought from Mike after I took my turbine building course. I built one like my little one, and I helped build one like my bigger one, but I had Mike build the ones I bought. Experience is worth something. His simple designs have been proven. Nothing fancy, but plenty of them in service.

For wind, its a relatively easy job to build a turbine from commonly available stuff, if you can get magnets. I went for simple rather than high efficiency.

Sourcing and erecting a tower is a much bigger job, imho, than building a turbine. And with 9mph wind, it's more of a novelty here. But on some days in winter it would no doubt be nice to have a turbine spinning, even here. I have not ever gotten a tower up. Expensive, complicated job, usually requiring a crane. I've been shopping for a good tower deal forever.

I have a low wind Mallard LW built from a repurposed Delco car alternator, and a bigger Mallard SP80.



http://www.mikeswindmillshop.com/product/low-wind-mallard-lw


Nice! micro wind has been mostly destroyed by low cost solar. as mentioned the tower costs and maintenance make them non competitive except on the best wind sites. ...

True. As you said, the advantage a wind turbine could have over photovoltaic is strictly in places where there is a lot of pretty constant wind, particularly at night, I might add.


Great for boats.  Boat mounted turbines max out their performance when you're actually under sail, so its a little different than a land based turbine.

Wind generators really produce power when sailing on a reach. The wind coming off the main sail gets directed back to the wind generator at a higher wind speed causing the wind generator to produce power.

The coast here is windy enough to make them work at anchorage, but that isn't a given everywhere.




I had a hairbrained idea at one time that you could set up a vertical axis wind turbine on a boat that would be speed regulated by a "governor" (sort of like those steam engine governors that slow down or speed up with the centrifugal force of weights) type rotor assemply that would reduce wind exposure when the wind got too strong and increase it to max when the wind was weak. I fancied that the mast of this wind turbine would have to be REALLY strongly attached to the frame of the boat, simply because the gyroscopic effect would be fighting the rocking of the boat in normal seas, trying to tear it loose, all the time.

It was probably a bad idea but I enjoy those types of thought exercises, even if they never come to a hill of beans.  8)

Way back in the early years of the 20th Century an ocean liner owner got the bright idea to use giant gyroscopes bolted to the bottom inside base of the ocean liner so the ship would not rock in high seas. When the ship got into some rough seas, the huge and weighty gyroscopes (there were around four of them placed equidistantly along the bottom inside), each as tall as three humans, tore the bolts off. Those dadgum giant gyroscopes just did not wanna go where the ship was going.

Of course, that was the end of that idea.

I had a flight student that was an ocean liner officer. He invited me on board and showed me the bridge. Since he was learning to fly and knew the ship controls would interest me, he showed me how the "wings" of the ocean liner worked. The vanes under the water line are used to generate hydrodynamic "lift" up or down, like ailerons on an aircraft (vanes on the port side work opposite the vanes on the starboard side). He explained those vanes keep the liner from rocking much in rough seas. Let me tell you, they are not that small, even though they are much smaller relative to the ship body than aircraft wings are to a fuselage. Those vanes are very tough as well. If water/wave pressure from a surprise sea can tear off a ship's rudder, those hydrodynamic vanes need to be super strongly attached.

I guess that's the way they finally went when the gyroscope idea didn't work out. That was way back in 1970. I don't know if they still use "wings" under water to stabilize ocean liners.   
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