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OLD 17 FOOT PAGE 4

Page 4

This page is about an older project of ours. We keep ALL of our projects up on

the internet for anyone that's interested...but we are no longer pursuing many

of these older ideas. Before starting this project, please check our main Wind

Power page to check for similar, more recent designs. These will be the top of 

the list and flagged with an "active project" tag. If you have any questions

about what is current and what is not, or why we no longer work on certain

designs, first check out our Wind Turbine Evolution page for a detailed history

of how our designs have changed over the years. You can also Email us and

we'll fill you in as our email volume permits...check the Evolution page first.

para Español This is 'page 4' of the project. The goal was to build a simple 17' wind

turbine, basicly a scaled up version of earlier machines we've built which are very

much inspired by Hugh Piggotts 'Axial Flux' wind turbine plans. The previous 3 pages

detail some of the construction of the machine. This page will talk about finishing

up, raising the tower and wiring it in.

And, be sure to check out our book Homebrew Wind Power -- it has all the

information you need to build this turbine.

PAGE 1

 

PAGE 2

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PAGE 4

 

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tower and

raising!

The first step is to get the machine up on the tower. It's a simple arrangement--the

tower top has a stub of 2 1/2" pipe, with a thick flat 'washer' welded on the end.

There is a plastic bushing on top of that, and then the machine simply slips over the

top of the tower and rests on the plastic bushing. The wire goes straight through the

tower, up through a hole in the wind turbine, so as the machine turns the wire can

twist. At the bottom of the tower there is a heavy 3 prong locking plug that we can

unplug to occasionally allow the wire to untwist if necessary. The machine itself, not

counting the blades or the tail, weighs 160 pounds.

Pictured above we have it completely assembled and ready to go on the end of the

tower.

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There's another picture of it before we raised it. We balanced the blades in this

position. To balance the blades we simply let it turn so the heavy part comes to the

bottom (6 O'clock). Then we lift the heavy side up to the 3 O'clock (or 9 O'clock)position and add weight opposite it, until it seems to be balanced. These blades

came out almost perfectly, we added about 8 Oz to one side of the hub. Lead makes

nice stuff for balancing - wood screws go right through it. Scott brought me up some

lead 'decoy' weights (used for weighting down duck decoys) - they are perfect for the

job and available at sporting goods stores.

My tower is 60' high, I raise and lower it with my truck. It's much heavier now than it

used to be with my old 14' machine, not only is the machine heavier - but I added

probably 150 pounds to the tower itself to strengthen it. On top of that, we had 10"

of snow. My only chance at pulling it up was to chain up all 4 tires and fill the truck

with wood. Once I did that, it was no problem. The first step before I raised the

machine was to raise just the tower and make sure it worked OK. Then I raised the

tower with just the alternator to see if it would handle the weight (so I wouldn't

chance breaking the blades). Once both those things went well, we raised the

machine with no problems.

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A VERY fine book on building

your own wind turbine from

scratch, with step-by-step

instructions. We know, because

we wrote it! Buy it here.

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There's a picture of just the alternator on the tower top.

That's how it looks up on the tower!

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NAVIGATION

Feed aggregator

Here's a picture from the back side I took on a windy day. I played with my camera to

make the blades look like they're running perhaps a bit faster than they really are.

Here it is pictured all furled up in a very high wind. So far it's withstood winds over

60mph a few times with no problems.

So far the machine works quite well. It has such a huge swept area compared to our

previous machines that it seems to start up in practically no wind, and it's making a

little power by the time the anemometer says 5 mph. At 10 mph it's doing around 400

watts and at 16 mph it's up around 1.5KW. Above that I believe the blades areoverpowered a bit by the alternator. I do see 2KW from it frequently and I've seen

about 3800 watts from it a couple times in very high winds, but overall I believe the

blades are held back a bit in higher winds by the alternator. I can improve it by

adding a bit of resistance to the line - this would allow it to speed up in higher winds

and the blades would run more efficiently - but as it is it seems very slow and

peaceful, and it rarely goes over 200 rpm It's producing quite a bit more power than I

can really use. So I'll leave it as it is, it's quite a good low wind machine I think. Time

will tell how it holds together! It has been fun, the whole project took 3 weeks from

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start to finish, I had some friends and neighbors (all of which have their own

homebrew wind turbines) helping along the way which was wonderful.

PAGE 1

Frame fabrication and

alternator design

procedures

PAGE 2

Frame finishing and

alternator

fabrication

PAGE 3

Alternator and

blade assembly

PAGE 4

Installation on

tower and

raising!

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