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'[OT]: tethered blimp mounted wind generator'
2006\03\21@083246 by M. Adam Davis

face picon face
The stronger the wind, the lower the blimp will go on its tether.
Interesting idea.  The blimp and blades would have to be designed so
the blimp shape doesn't take too much energy from the wind before the
blades do.

You could put anemometers along the tether to find the layer of air
that's most appropiate for the windmill at any given time.

-Adam

On 3/21/06, blackcat <spam_OUTgscTakeThisOuTspamomegadogs.com> wrote:
{Quote hidden}

> -

2006\03\21@120444 by James Newtons Massmind

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I think the angle at which the blimp is held could compensate for the
tendency to change altitude with wind speed and actually allow the blimp to
sail higher (like a kite). On the other hand, that might be a good rate
limiting system.

Just for reference, my web page on this idea is at
http://www.massmind.org/techref/idea/flymill.htm

The other problems I see are:

1. Keeping it from tangling the lines while at the same time allowing it to
turn into the wind. It may be that it should just be used where the
prevailing winds do not often change.

2. The cost of maintaining a helium blimp. Other methods of keeping it up in
calm air might include a super light whip (like an antenna) or roof top
launch combined with a cable extension system and kite like flying to
working altitude.

3. The physical stress between the pully and the blimp body and between the
blimp body and the wings. The wings should be connected as directly as
possible to the pulley.

4. Slipping of the line as it passes over the pulley. A knotted line /
spoked pulley might be necessary.

---
James.



> {Original Message removed}

2006\03\21@132544 by John Ferrell

face picon face
I assume you are going to bring the generated power down on a wire
connection. If that is the case, you have devised the worlds longest
lightning rod...
John Ferrell
http://DixieNC.US


----- Original Message -----
From: "James Newtons Massmind" <.....jamesnewtonKILLspamspam@spam@massmind.org>
To: "'Microcontroller discussion list - Public.'" <piclistspamKILLspammit.edu>
Sent: Tuesday, March 21, 2006 12:04 PM
Subject: RE: [OT]: tethered blimp mounted wind generator



2006\03\21@133802 by Michael Rigby-Jones

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>-----Original Message-----
>From: .....piclist-bouncesKILLspamspam.....mit.edu [EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu]
>Sent: 21 March 2006 18:29
>To: Microcontroller discussion list - Public.
>Subject: Re: [OT]: tethered blimp mounted wind generator
>
>
>I assume you are going to bring the generated power down on a wire
>connection. If that is the case, you have devised the worlds longest
>lightning rod...
>John Ferrell
>http://DixieNC.US

Looks to me like the power is delivered via the rope and pulley system shown in the picture.  Ireckon the blimp would have to be much larger in comparision to the ropes and pulleys shown in the pictures just to support their weight.  The blimp would also want to pull itself down the cable as it rotated.

Regards

Mike

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2006\03\21@134704 by James Newtons Massmind

face picon face
> I assume you are going to bring the generated power down on a
> wire connection. If that is the case, you have devised the
> worlds longest lightning rod...
> John Ferrell
> http://DixieNC.US
>

No, the generator is on the ground. The flymill pulls up on one side of its
tether and lets that out on the other side. The loop is completed on the
ground with one corner consisting of the generator and the other a spring
loaded pulley to maintain tension on the line.

---
James.


2006\03\21@141450 by James Newtons Massmind

face picon face
> Looks to me like the power is delivered via the rope and
> pulley system shown in the picture.  Ireckon the blimp would
> have to be much larger in comparision to the ropes and
> pulleys shown in the pictures just to support their weight.  
> The blimp would also want to pull itself down the cable as it rotated.
>
> Regards
>
> Mike

A lighter line and pulley made of a very light material as well as a larger
blimp or some method of using the wind to pull the unit higher like a kite.

The amount of power taken up by the generator on the ground has to be
balanced against the upward pull of the unit so that an operating height is
maintained.

Basically, the field of the generator needs to be modulated in proportion to
the takeup spring tension on the other gounded leg of the teather.

I think...

---
James.


2006\03\21@174430 by VULCAN20

picon face


James Newtons Massmind wrote:

>No, the generator is on the ground. The flymill pulls up on one side of its
>tether and lets that out on the other side. The loop is completed on the
>ground with one corner consisting of the generator and the other a spring
>loaded pulley to maintain tension on the line.
>
>---
>James.
>  
>

But the spring loaded pulley would not be necessary.  The lift of the
blimp would be what kept the belt tight.

Some one with more engineering skills than I have could calculate the
amount of lift to keep the belt tight  as opposed to the power to turn
the pulley on the alternator or generator.

The next thing to consider is wind resistance of the blimp.  The more
resistance the farther down wind the blimp would move from the generator
point

bob

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