I know half a dozen of us raised a Rohn 25, 50' tall as I recall, with a TA-36 tribander and a couple VHF antennas on top, walked it up. I was surprised that it wasn't harder than it was. We probably could have done it with less men. We did have a pickup truck attached to it for the last bit, once we had raised it high enough that it was hard for us to push it up further. The truck took over.
It seems to me your point of lowest mechanical advantage (greatest mechanical disadvantage) in lowering it is at the beginning, 'til it gets down within easier reach of you and your helpers. But for that tower, a decent (not string or twine but it wouldn't have to be super heavy) rope over the house or some other high point, should easily take care of it.
73 - Rich, KE3Q
----- Original Message -----
From: ersmar at comcast.net<mailto:ersmar at comcast.net>
To: Don M<mailto:hy_tek at hotmail.com> ; towertalk at contesting.com<mailto:towertalk at contesting.com>
Sent: Wednesday, October 12, 2005 12:20 PM
Subject: Re: [TowerTalk] Rohn 20G Tower lay down questions
Don:
Regardless of what folks tell you about lowering the tower, do NOT use the chimney as a pulley support. Chimneys might not be part of the house structure.
One of my summer jobs in college was for a brick mason. We laid brick for homes, including chimneys. Exterior brick chimneys (those that appear to run up along an outside wall of a residence) are nothing more than three sides of brick laid up around the central flue liner (the yellowish core sticking up through the tops of most modern chimneys.) These brick layers are connected to the house wall by nothing more than corrugated steel straps cemented between the brick courses and nailed to the walls. (Sometimes I cringe at TowerTalkians' suggestions for mounting rotating HF arrays atop chimneys.)
Caveat Amateur.
73 de
Gene Smar AD3F
> I currently have a Rohn 20G tower which consists of 2 - 10' and 1 - 9' top
> sections about 29' tall overall not including antenna. It has a hinged base
> which enables the tower to be layed over to the ground. I need to rework the
> top mast section which is rusted and prevents me from replacing the mast.
> How difficult is it to lay this tower down? Can it be done by just having 3
> men or so walk it down or is it too heavy to do it that way. I can run a
> guide rope from over my brick chimney which is about half way up for added
> support while lowering. The weight of the mast and antenna is nominal. From
> what I've read the weight of the 20G tower sections adds up to about 90
> pounds total. Since I was not here when the tower was installed I have no
> idea of the difficulty in laying it over manually. Can this be done? Thank
> you.
>
>
> Don
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com<http://www.mscomputer.com/> for "Self Supporting Towers", "Wireless Weather
> Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
> and ask for Sherman, W2FLA.
>
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_______________________________________________
See: http://www.mscomputer.com<http://www.mscomputer.com/> for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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