On Sat, 03 Apr 1999 16:34:26 "Richard L. King" <k5na@texas.net> 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
K6LL@juno.com
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