Another non-believer who obviously has not tried the experiment and made the
measurements.
Stan
w7ni@easystreet.com
n4kg@juno.com wrote:
> The pulley at the top of a gin pole merely changes
> the direction of the rope. Please explain how a
> block and tackle "Magically" reduces the force on
> the rope to the top pulley and how to install the
> block and tackle to achieve this magical reduction.
>
> One more point. One pulley can give a 2:1 mechanical
> advantage if one end of the rope is attached to a FIXED
> support. If both ends of the rope are moving, there is
> NO mechanical advantage, only a direction change
> plus loss due to friction.
>
> de Tom N4KG
>
> On 13 Jun 2001 Mike Gilmer - N2MG <n2mg@contesting.com> writes:
> > Steve, you are "half" right.
> >
> > The lift effort is part of the overall load on the
> > ginpole (everyone forgets this), so without any
> > mechanical advantage there is 2X load weight applied
> > to the ginpole. If you employ a 3:1 advantage, and
> > thereby reduce the lift force needed, you decrease the
> > overall force on the ginpole.
> >
> > 73 Mike N2MG
> >
> > On Wed, 13 June 2001, K7LXC@aol.com wrote:
> >
> > > In a message dated 6/12/01 11:45:50 PM Pacific Daylight Time,
> > > w7ni@easystreet.com writes:
> > >
> > > > A 3:1 mechanical advantage block and tackle system does,
> > indeed, relieve
> > > > about 1/3 of the load on the gin pole, in addition to reducing
> > the number
> > > of
> > > > bodies required on the pull rope.
> > >
> > > You sure? Isn't a hundred-pound load going to weigh 100 pounds
> > no matter
> > > how the block and tackle are set up? The load effort on the end of
> > the rope
> > > will be reduced but the dead weight of the load stays the same.
> > You still
> > > need a suitable ginpole.
> > >
> > > Cheers, Steve K7LXC
> > > Tower Tech
> >
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