[TowerTalk] ratings on wire rope

[Al Williams]

>     Picture a pulley up on your tower and you want to pull a 1,000 load
with
> a rope that goes through and down to the ground where you're going to
pull.
> The load on the pulley is 2,000 pounds - 1,000# on the load side and
1,000#
> on the pull side.
> >

A questions for the physics experts -- Is it true that in order to pull up
the 1000#
load that the pull will have to be 1000# plus the amount to overcome the
loss
due to the pulley efficiency?  What is the efficiency for a typical 3 to 5"
pulley
of various bearing designs?

k7puc



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