Some do, some don't. Most of my experience is with Tri-Ex towers (now Tash).
One I had had a single cable which would extend 4 sections one at a time to
about 70' height, when ne section was fully extended it'd latch the next
one. Worked OK, but everything relied on that one mission-critical cable.
The tower I have now (LM470) is proportional, it all four sections move in
harmony, so for each foot of vertical lift, each section moves roughly 3" (1
ft / 4). I actually like this arrangement better...the cabling is more
complex but there is some level of redundancy because there is s "pull-up"
cable and a "pull-down" cable. In addition, if I have the whole thing up in
the air and a big wind or ice storm is forecast, I can opt to lower it all
totally, or lower it 25%, 50%, etc., and the overall exposure is lowered
proportionally.
So far as access to the rotor, I only need to extend the (proportional)
tower to about 30' total height to have the total rotor and mast exposed so
I can get to them. This becomes a ladder climb about 20', then another 10'
climb with belt/harness. Sure beats going up the full 70'.
Not sure what you were looking for, or if I told you what you wanted to
hear, but that is the situation here.
73
dan
k0dan
-----Original Message-----
From: Dan Hearn
Sent: November 29, 2011 11:44 AM
To: towertalk reflector
Subject: [TowerTalk] Crankup towers
I have several UST crankup towers. As they extend, all sections extend
proportionally. Do some other brands of towers extend each section
completely before the next section extends? That would sure make it easier
to access the rotor for replacement.
--
Dan Hearn
N5AR
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|