On 2/2/2012 7:48 AM, Wilson Lamb wrote:
>
> Worse yet, if you get the least lateral displacement you will get the cable
> off to the side of the hinge/tower plane and you will then have the top of
> the tower trying to go sideways because of the cable pull being off axis!
> You can tear your hinge apart and wreck your beam in a heartbeat>
In my early days of experimenting with irrigation pipe verticals I
encountered this problem, but it just wrecked some old tubing.
Glad I didn't learn this on a tower. You really want to side guy
the tower if possible.
> The falling derick advice is right on, BUT you have to be sure the base of
> the derick is wide enough to provide the lateral stability you need to
> prevent the off center situation above. AND you have to secure the cable to
I prefer to side guy the falling derrick. Again, I experienced early
on the consequences of not doing this.
I always mount a pulley at the top of the derrick and run the rope
through it to a ground anchor located where the pulley hits the ground.
This gives me positive pull down when the tower is near vertical, and
controlled descent. If you just tie a rope to the
top of the derrick, you have no leverage when the tower is near
vertical.
Rick N6RK
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