i have not had a need to do it, but a 2:1 arrangement would also be easy to do.
all you need to do is tie one end of the rope to the top of the pole, run
through a single moving pulley where you attach the load, then go through the
normal gin pole pulley and back to the ground. of course it takes 50% more rope
than just going up and over the gin pole pulley. why not DOUBLE the rope you
may say??? well, think about it... in the normal setup you go up the tower and
back down to the load. with a 2:1 setup like this you go up the tower, down to
the moving pulley, and then back up to the top... so you only have one extra
length going up the tower... each increment in mechanical advantage adds one
more length equal to the max lift height to the length of rope needed. so a 3:1
advantage only needs 2x the rope as the 1:1 normal use of the gin pole.
"Guy Olinger, K2AV" wrote:
>
> See other post on how advantage achieved.
>
> > This is NOT how a gin pole is configured.
>
> A gin pole is just a device to give an attachment opportunity high enough
> above already
>accomplished structure to allow fixing various lifting devices to control both
>vertical and
>horizontal forces on the next section for easy attachment. It doesn't imply
>any particular lifting
>arrangement, though some may be manufactured with a particular device integral.
>
> Other than a single pulley, the top hook of a 4:1 block and tackle setup is
> another device that can
>be attached to the top of a gin pole. I've seen an electric winch fitted to a
>gin pole.
--
David Robbins K1TTT
e-mail: mailto://k1ttt@berkshire.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
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