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
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
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
:[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 to that rim. The airfoils
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
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:
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
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 modulus
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,
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's an
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
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 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, the
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, until
[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
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
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