And what if there are no workers applying "downforce", but instead the end
of the line is tied off to a tree, and the load is suspended static?
Jim W4LC
-----Original Message-----
From: Paul Finch [mailto:paulfinch@msn.com]
Sent: Wednesday, June 13, 2001 2:24 PM
To: Tower Talk; n4kg@juno.com
Subject: RE: [TowerTalk] Ginpole for 20 foot sections
Hello,
So the weight exhibited to the Gin pole at the top pulley mount point is the
down force of the load line plus down force it takes to hold the load static
at the workers end of the load line? No matter how many times the
advantage. Right?
Paul Finch
WB5IDM
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of n4kg@juno.com
Sent: Wednesday, June 13, 2001 1:46 PM
To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] Ginpole for 20 foot sections
More N4KG observations and comments inserted below.
On Wed, 13 Jun 2001 12:18:30 -0400 "Guy Olinger, K2AV"
<k2av@contesting.com> writes:
> The reduction mechanism of a ganged pulley system is in the number of
> feet of rope the worker pulls in as a ratio to the distance the load
> travels. In a two to one system the worker pulls 200 feet of rope to
> lift the object 100 feet, thus the analog to a lever, and the
> advantage.
The distance traveled is a RESULT of the mechanical
advantage, NOT the CAUSE, but can be used to calculate
the mechanical advantage. N4KG
> Two to one: rope tied at top block, through pulley at bottom block,
> through pulley at top block, to worker.
>
> Three to one: rope tied at bottom block, through pulley at top
> block, through pulley at bottom block, through pulley at top block,
> to worker.
>
> Four to one: rope tied at top block, through pulley at bottom block,
> through pulley at top block, through pulley at bottom block, through
> pulley at top block, to worker.
>
> 73
Note the presense of MULTIPLE pulleys at the top
of the block and tackle. A GIN pole has only ONE
pulley at the top. The only way to get a mechanical
advantage is to use a SEPARATE block and tackle
with a SECOND ROPE. As I said before, this helps
the puller but does nothing to reduce the load on the
GIN Pole. de Tom N4KG
>
> >
> > From: Mike Gilmer - N2MG <n2mg@contesting.com>
To: <towertalk@contesting.com>
> > Date: 2001/06/13 Wed AM 09:06:35 EDT
> > To: towertalk@contesting.com
> > Subject: Re: [TowerTalk] Ginpole for 20 foot sections
> >
> > Nothing "magical" about it...
> >
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