Hi all,
The gin pole feels a downward force equal to twice the attached load.
Thus the person pulling the rope has a 2:1 advantage in terms of his
or her ability to push the tower down into the ground. His ability to lift the
attached load however is 1:1.
Mike, W4EF.........
----- Original Message -----
From: <n4kg@juno.com>
To: <TOWERTALK@contesting.com>
Sent: Wednesday, June 13, 2001 11:45 AM
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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