|Subject:||[TowerTalk] Re: TowerTalk Digest, Vol 23, Issue 47|
|Date:||Fri, 12 Nov 2004 10:42:21 -0600|
Pat Chiles, firstname.lastname@example.org wrote:
Both are used on my tower.
The raising fixture only has one pulley.
Mine has 2 on the fixture also.
The cable goes over the pulley at the raising fixture, around one of the pulleys at the tower, and back to the raising fixture where it is terminated on a bolt. We have it rigged per the instructions.
Mine goes back again to the tower through a second pulley on the fixture, to the second pulley on the tower and then back to the fixture terminated with a bolt, as you see. This appears to double the mechanical advantage? Physics types could tell you.
I can crank my tower (TX-472) very easily with one hand without a break. It comes up very slowly, but that's due to the mechanical advantage of the pulleys. I have a Force 12-5BA (~85 pounds) and Force 12-240/230 (~50#) and a mast of over 100# on my tower. I've even had my wife crank the fixture just to show her how easy it was.
Perhaps they only use 1 pulley because you've got 1 less section with a 555 vs a 472 tower? Only guessing, but I would think the extra advantage of the second pulley would make all the difference in the world.
de KJ0M Jim ._._. _______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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