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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