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[TowerTalk] Gin Pole Strength

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Subject: [TowerTalk] Gin Pole Strength
From: (Pat Barthelow)
Date: Mon, 22 Mar 1999 18:52:46 -0800 (PST)

Not only that, but the load on the gin pole may not be what you think!
Think of a similar, but simpler situation.  a pulley anchored in a
ceiling, with a single rope through.  A 30 lb bucket of paint directly
under the pulley, is tied to the rope and lifted off the floor, with the
free end of the rope through the pulley. (Also pulled straight down
from the anchor point of the pulley.)  What is the (downward) load on the
ceiling attachment point of the pulley.  An identical problem, to lifting,
say, a 45 lb tower section, with a gin pole, and the rope going thru the
gin poles, and the free end is vertical and either grasped directly below
the gin pole, on the ground, or thru a snatch block at the base of the

(The loads are DOUBLE the weight lifted.....)

73, DX, de 
Pat, AA6EG/N6IJ;
599 DX Drive, Marina CA 93933
"The Contest Station from the Government"

On Mon, 22 Mar 1999, Gary McDuffie, Sr. wrote:

> On Sat, 20 Mar 1999 12:51:24 -0800, Stan Griffiths wrote:
> > Use of a block and tackle with 3:1 mechanical advantage will reduce the 
> > load on the gin pole a
> > whole bunch.
> How so?  The gin pole will still be handling the same amount of weight.
> The "operator" will have less load, but not the gin pole.
> Gary McDuffie - AGØN
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