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[TowerTalk] Gin Pole Strength

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Subject: [TowerTalk] Gin Pole Strength
From: (Michael Tope)
Date: Mon, 15 Mar 1999 07:02:01 -0000
Can anyone out there give me advice (anecdotal, analytical, or otherwise) on 
sizing a gin pole 
for structural integrity? I have a requirement to drop 24' of 1/4" wall 4130 
chrome moly into
a Rohn 25G tower (estimate wt ~120 lbs). I currently have in hand a 20' section 
of schedule 40 
6061-T6 water pipe (1.915" OD; 0.158" wall) which I hope to use for the job in 
conjuction with
WB0W gin pole fixtures (pulley and bracket). The actual working length 
(measured from the 
bracket to the pulley) would be around 15' to allow for raising the the moly 
masts center of 
gravity (z=+12') above the top of the tower.

My feeling is that the aluminum pipe should be adequate to the job provided 
that we take 
reasonable precautions to keep the load (mast) roughly collinear with  the gin 
pole (e.g.
minimize side load). Any comments on my assumptions would be appreciated, 
from those who have already performed similar feats. 


Mike, W4EF/6 


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