[TowerTalk] Rohn RSL tower - slightly off topic

[George Dubovsky]

I'm with you, Chuck. The torque is additive regardless of which side of the
mast the antenna(s) are on.

73,

geo - n4ua

On Thu, Jun 6, 2019 at 1:32 PM Chuck Dietz <w5prchuck at gmail.com> wrote:

> Maybe I’m dense, but I don’t see how this does anything (much). If the
> back of both antennas has a larger wind area than the front, the torque on
> the mast is going to twist the mast in the same direction no matter to
> which side it is attached.
>
> Chuck W5PR
>
> Sent from Mail for Windows 10
>
> From: k7lxc--- via TowerTalk
> Sent: Thursday, June 6, 2019 11:38 AM
> To: towertalk at contesting.com; bjtatum1 at att.net
> Subject: Re: [TowerTalk] Rohn RSL tower - slightly off topic
>
>
> >  Hello-? ? I was at a friend's QTH recently viewing his new Rohn
> RSL100L10, a 100' self supporter put together with 10' sections R-10H
> through R-1. It is rated for 25 ft/2 wind load at 90 MPH, dropping back to
> 11 ft2 at 100 MPH. We were discussing his planned installation of a KT-36
> and M2 3 ele 40 meter yagi. He wishes to have the KT-36 about 15' above the
> tower top plate with the 40 meter yagi approx. 1' or 2' above tower top.
> Both antennas are fairly close in weight (approx. 95#), boom length (36')
> and wind load (10 ft2). ? I wanted to get opinions of folks experienced
> with large antennas and self supporting towers if this planned installation
> is OK for this tower.
> Hiya, Byron --
>     The proposed configuration sounds good to me but I'm not offering an
> answer to your question. What I am offering is a tower technique that I
> highly recommend.
>
>     Install the antennas on opposite sides of the mast. That way many of
> the wind vectors cancel each other out. This was determined by Dick Weber,
> K5IU, a PE and the article appeared in QEX years ago. Anything you can do
> to reduce the wind induced torque on a mast is a good thing. Did I mention
> this is highly recommended?
> Cheers.Steve    K7LXCTOWER TECH
>
>
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