On Sat, 03 Apr 1999 16:34:26 "Richard L. King" <[email protected]> writes:
> Then a rope would be run from the lifting person, up the tower
>and
>through the ginpole pulley, down to the weight and through the
>attached
>pulley, and then back up the tower and tied to a connection point. To
>lift
>the load requires 200# of upward pull that is equally shared between
>the
>two ropes through the pulley at the weight. That would be 100# on each
>side
>of the rope and the total 200# of lift is shared between the ginpole
>pulley and the tie point on the tower. This subsystem is now in
>balance.
>
>Now that the ginpole only has 100# of downward force on it, the pull
>at the
>person end of the rope only needs to be 100# to get the system in
>balance
>and to start the lifting.
>
>The reason nobody does this is that it requires two points of
>attachment at
>the top of your lift. Since one point is the ginpole (which is up
>high) and
>the other is on the tower somewhere (which is much lower) you can only
>lift
>the weight to near the lower connection point.
Secure the rope firmly to the top of the ginpole mast,
not the top of the tower.
Dave Hachadorian, K6LL
Yuma, AZ
[email protected]
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