[SBE] FW: Block and tackle question

[Cowboy]

On Friday 08 August 2008 08:28 am, John Poray wrote:

>  -----Original Message-----

>  From: Bill Whitt [mailto:billw at betterlifetv.tv] 



>  Hello all,

>  

>              I have to do a new transmitter install on a 150 foot tower. I'm

>  pulling 1 5/8 cable up the stick to about the 120 foot mark. I got to

>  looking at our block and tackle gear, and I don't think this stuff will

>  handle the weight of cable at that height. I was doing some thinking off the

>  top of my head, and near as I can figure a 100 pound antenna being hoisted

>  at that height would be about 580 or so pulling pounds.


 Not even close, unless you're using a really heavy load line.
 Pulling a 100 pound antenna will be 100 pounds plus headache plus tag,
 pulling force, decreasing as the antenna rises.
 Block load is 2X antenna plus headache plus load line plus tag.
 Any good rigger should know this without even thinking.


>  Any suggestions on 

>  sourcing new gear. I really want a smooth install. A winch may do the trick,

>  but I can muster up a ground crew too with no issues - meaning that if a 4:1

>  pulley network is your favorite I would look at that suggestion as well.

>  Any suggestions on sources and gear I would appreciate.


 There is no personal slight intended, but.....
 I'd suggest you find an experienced rigger who understands
 why we do what we do, especially aloft.
 Compared to crashing an antenna, or killing a man, we are 
 not that expensive !

 It's one thing to hang a 4 pound TV antenna and a run of RG-6.
 It's quite another to hoist weight.

-- 
Cowboy

http://cowboys.homeip.net

Keep your Eye on the Ball,
Your Shoulder to the Wheel,
Your Nose to the Grindstone,
Your Feet on the Ground,
Your Head on your Shoulders.
Now... try to get something DONE!