[TowerTalk] Ginpole for 20 foot sections

[JBaumgarte@aol.com]

In a message dated 6/13/01 8:20:39 AM Central Daylight Time, K7LXC@aol.com 
writes:

<<    You sure? Isn't a hundred-pound load going to weigh 100 pounds no 
matter 
 how the block and tackle are set up? The load effort on the end of the rope 
 will be reduced but the dead weight of the load stays the same. You still 
 need a suitable ginpole. 
 
 Cheers,   Steve    K7LXC >>


Good grief!  Steve, as usual, is correct.  It matters not whether you have a 
4:1 or 8:1 block and tackle set up for lifting--the load on the gin-pole is 
the same (actually plus the weight of all that rope).  

I do the opposite when lifting Rohn 55 sections. I go for mechanical 
DISADVANTAGE, and speed ADVANTAGE.  I use a CJ5 to pull with a movable pulley 
attached to the monster hook on the front of the Jeep.  This requires the 
Jeep to back away from the tower only half the distance of the lift and 
surely the Jeep doesn't flinch at 250# of pull compared to the normal 125#.  
Went to this because I only had 60' of clear backing room and needed to lift 
110'.  With good sailboat type pulleys (a turning one at the bottom of the 
tower and the movable one on the Jeep) and strong rope there is no problem.  
The load on the gin-pole is still the same but the one spot with double load 
is the movable pulley on the Jeep.

John, N0IJ

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