Well, Tom . . . you are STILL a nonbeliever and you STILL have not tried the
experiment
and you STILL have not made the measurements, obviously. And you are STILL
very WRONG
about this concept. Its OK with me for you to be wrong about it if you want
to, but
please quit leading others down that path . . .
Stan
w7ni@easystreet.com
n4kg@juno.com wrote:
> I agree completely with your analysis Guy. Which end of the
> gin pole rope is attached to a "block" ? q.e.d.
>
> Bottom Line: The mechanical advantage in a lossless system
> equals the number of supporting segments between the LOAD
> and the SUPPORT.
>
> For a GIN POLE this number is ONE i.e. NO mechanical advantage.
>
> Sum of Forces approach: Load on one side of the gin pole pulley
> must be balanced by the "pull" on the opposite side. The Gin pole
> supports the LOAD plus PULL, or twice the weight of the load.
>
> Rope In = Rope Out approach: The amount of rope going into
> the gin pole pulley equals the amount of rope coming out of the
> gin pole pulley. Mechanical advantage = ONE.
>
> The gin pole rope MAY be attached to the HOOK of a Block
> and Tackle which will provide a mechanical advantage to the
> puller but NOT to the gin pole. The other end of the block
> and tackle is presumably anchored to the ground. Two ropes
> are involved here. The block and tackle rope will travel X times
> the distance of the load where X is the mechanical advantage.
> The gin pole rope will travel the same distance as the load,
> i.e., the height of the tower.
>
> Time for a new thread.
>
> de Tom N4KG
>
> On Wed, 13 Jun 2001 "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.
> >
> > 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
> >
> > >
> > > 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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