In reply to Terry Blanton's message of Thu, 14 Apr 2005 14:06:04
-0400:
Hi,
[snip]
>This web page:
>
>http://www.lr.tudelft.nl/asset/webpage/en/laddermill.php
>
>says to use dyneema:
>
>http://www.dsm.com/en_US/html/hpf/home_dyneema.htm
[snip]
Yes, I slipped up, and used a figure for tensile modul
In reply to Jed Rothwell's message of Thu, 14 Apr 2005 11:22:23
-0400:
Hi,
[snip]
>We have confused two different devices in this discussion.
Well I had anyway. Sorry, I never really gave the laddermill any
real consideration at all.
>The whole scheme is as improbable as Superman comic book.
I
>
> From: Jones Beene <[EMAIL PROTECTED]>
> This could be the "killer-ap" which increases the
> demand for kevlar (and/or normal graphite fiber)to the
> level where cost falls very quickly.
This web page:
http://www.lr.tudelft.nl/asset/webpage/en/laddermill.php
says to use dyneema:
http://ww
At 11:22 AM 4/14/5, Jed Rothwell wrote:
>The whole scheme is as improbable as Superman comic book.
I must admit I have had to struggle to suppress the vision of a tangled
mess falling from the sky. 8^) Processes like air turbulence which are
described by differential equations tend to lead to
othwell [mailto:[EMAIL PROTECTED]
Sent: Thursday, April 14, 2005 1:46 PM
To: vortex-L@eskimo.com
Subject: Re: Laddermill Wind Generator
Jones Beene wrote:
Imagine a gigantic light-weight "Ferris wheel" built
using kevlar spokes with a thin rim of kevlar and with
the airfoils attached
Jones Beene wrote:
Imagine a gigantic light-weight
"Ferris wheel" built
using kevlar spokes with a thin rim of kevlar and with
the airfoils attached to that rim. The airfoils would
be individually controlled in their "attack angle" . .
.
Ah, yes. It would resemble a marine paddle wheel. The later
Looking ahead, there may be a better alternative to
the basic theme...
First, it ought to be easy to test the basic concept -
which is a series of rotating wing-like airfoils -
without going to the enormous expense of a jet steam
version.
Imagine a gigantic light-weight "Ferris wheel" built
using
I wrote:
It would have to be extremely
large I suppose, perhaps a kilometer in diameter (maybe 10 km?), so that
the Kevlar tether could exert enough leverage to drive a 100 MW wheel
without breaking.
I mean a whole bunch of tethers. Obviously leverage does not increase
power. I was trying to imag
Robin van Spaandonk wrote:
This is another reason to use
kevlar, however one also needs to
take into consideration that the power wires need to be added to
the weight of the cable . . .
We have confused two different devices in this discussion. The power
cable would be needed with the Skywindpowe
In reply to Stephen A. Lawrence's message of Wed, 13 Apr 2005
22:10:47 -0400:
Hi,
[snip]
>The problem is that the cable is going to hang in a catenary. If it's
>at a 45 degree angle at the kite, it's going to be at some much smaller
>angle relative to the ground. In order to avoid having thous
[EMAIL PROTECTED] wrote:
Hi Robin and Stephen,
...
Actually that's wrong. Because of the way in which tensile
strength is measured, the force pulling up on the cable can equal
the weight of the cable, so even at maximum length, almost any
upward force can be maintained, simply by making the cab
Hi Robin and Stephen,
...
> Actually that's wrong. Because of the way in which tensile
> strength is measured, the force pulling up on the cable can equal
> the weight of the cable, so even at maximum length, almost any
> upward force can be maintained, simply by making the cable
> thicker, unti
In reply to Robin van Spaandonk's message of Thu, 14 Apr 2005
08:51:11 +1000:
Hi,
[snip]
I wrote:
>>iron (7.87 gm/mL) = 176000 ft. At that length, any extra tension
>>(i.e. an addition "real" load), will break it.
Actually that's wrong. Because of the way in which tensile
strength is measured, th
In reply to Robin van Spaandonk's message of Thu, 14 Apr 2005
08:23:14 +1000:
Hi,
[snip]
>Because any cable needs to be able to at least support it's own
>weight, a maximum length can be calculated by dividing the tensile
>strength of the material by the density.
>For good steel I get 60 lb/sq
In reply to Jed Rothwell's message of Wed, 13 Apr 2005 16:49:24
-0400:
Hi,
[snip]
>I don't get it. I cannot imagine any material used for the tether would be
>strong enough to turn a 100 MW generator. Even 1 MW seems out of the question.
[snip]
Because any cable needs to be able to at least suppo
>
> From: Jed Rothwell <[EMAIL PROTECTED]>
> I don't get it. I cannot imagine any material used for the tether would be
> strong enough to turn a 100 MW generator. Even 1 MW seems out of the question.
I doubt the materials science people have been consulted for a 100 MW
generator. ;-)
Here'
Terry Blanton wrote:
According to this
article:
http://tinyurl.com/6n4ty
Delft Technical University is actually going to build
one!
Quotes from article:
"Strong high altitude winds acting on the kitewings produce as
upward force on one side of the loop and a downward force on the other,
causin
According to this article:
http://tinyurl.com/6n4ty
Delft Technical University is actually going to build one!
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