[TowerTalk] Question about lowering a Fold-Over tower
infomet at embarqmail.com
Thu Feb 2 07:48:52 PST 2012
Please don't do this until you can get some onsite help. You're looking for
As that tower gets near horizontal, the compression/buckling load from the
cable will be LARGE, easily enough to pull out a brace, if that's where you
hook on. Who knows if your hinge hardware can take the load? It might be
enough to spin the tires of your car, if on grass.
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!
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
the top of the derick so the derick can't slip on the cable and drop the
tower as it gets low! 20' of Rohn 25, guyed to the sides, would make a good
There may be other problems, but this should be enough to convince you to
wait for some local guidance.
I'm going to lower a 90' Heights aluminum fold over tower with my car
tomorrow evening. I've done this before without destroying the tower so
hopefully I can have another successful lowering!
My question is what is the best height on the tower to attach my Nylon
Strap for lowering the tower?
A few thoughts:
1) The 90' tower folds over at ground level and has a 36" wide base.
2) In the past, I attached my nylon strap around the tower at aprx. the
35' level and then attach a 1/4" steel cable to the nylon strap and raise
lower the tower with my car.
3) I keep the top of the tower 13' off of the ground so there's room to
attach my 24' boom Yagi to the top of the tower. Keeping the top of the
tower 13' off of the ground makes it easier to lower and raise the tower
vehicle than if the top of tower was on or near the ground. That said,
with the top of the tower 13' off of the ground it's still quite touchy
raising and lower the tower as only as a small movement in the vehicle
big change in the tower.
So I'm looking for the best strap height to lower the tower and the best
strap height for raising the tower. After using the 35' height before... I
don't think that one height is the ideal height for raising and lowering
the tower. Since it's easy to locate the nylon strap anywhere on the tower
I'm looking for the best height for lowering and best height for raising.
All thoughts appreciated!
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