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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