[DARARepeater] Tower design help

[Greg Ham]

Mark,
Would a falling derrick work? See photos here:
http://www.n6rk.com/falling_derrick_gme/falling_derrick_gme.html

Greg AB8RG

On Mon, Jan 21, 2019 at 8:53 AM Mark Erbaugh <mark.election at gmail.com>
wrote:

>
>
> I’m looking for someone with more mechanical engineering smarts than I
> have.
>
>
>
> A few years ago, I installed a 50’ Universal aluminum triangular tower. It
> is not retractable. It has a hinged base. When I’ve needed to work on the
> tower, I’ve gotten several friends over and we have been able to walk the
> tower down and back up.
>
>
>
> What I’d like to do is come up with a fixture that would allow me to raise
> and lower the tower myself. I’m thinking something along the lines of a
> steel I-Beam concreted in the ground extending up 20 feet or so and a winch
> controlling a cable connected to the tower at that height. I have
> engineering drawings of the tower.
>
>
>
> My questions are how sturdy does the I-Beam need to be, how much concrete,
> how deep does it have to be buried, how much tension will be on the winch
> and how best to attach the winch cable to the tower? Can I just attach the
> cable to one leg at one point, or should I use some sort of a cradle that
> goes around the whole tower.  I would prefer a permanent connection to the
> tower so I don’t have to climb the tower to attach the winch cable when I
> need to lower the tower.
>
>
>
> 73,
>
> Mark, N8ME
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-- 
Thank you,
Greg
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