[TowerTalk] Need a Knot Expert

Wes wes_n7ws at triconet.org
Thu Nov 28 12:10:15 EST 2019


Okay. I guess my thinking was along the lines of my situation.  I too have a 
horizontal extension on the tower to support my inverted-vee. But my load is 
entirely vertical with the apex of the antenna directly under the pulley.

Wes  N7WS

On 11/28/2019 9:15 AM, Gedas wrote:
> GM Wes and happy thanksgiving !
>
> Surprisingly when the rope (knot portion with antenna) is hoisted up and the 
> antenna pulled tight that still tightens up those vertical ropes. Do you 
> remember that problem we were all given in college to calculate the tension in 
> a rope if you pulled on it in the middle perpendicular to that rope? Even 
> though that perpendicular pull is WAY WAY off on one end it still seems to 
> pull it out and away from the tower almost a foot stretching the entire 
> vertical ropes.
>
> Probably did a poor job explaining that but in the end the tension in those 
> vertical ropes does increase when the "dipole" is made nice and tight and 30 
> or so pounds of tension is applied. Add to that some wind or 1/2" of ice and 
> that 30 pounds seems to turn into several hundred pounds of tangential pull.
>
> Gedas, W8BYA 



More information about the TowerTalk mailing list