Google W9JCC. The spreadsheet is up on a website in zip form.
----- Original Message -----
From: "KJ0M" <email@example.com>
Sent: Tuesday, January 17, 2006 8:52 AM
Subject: Re: [TowerTalk] Triangular Crank-Up Wind Load Model
> On Jan 16, 2006, at 17:12, Kinney John-r17512",
> J.Kinney@freescale.com wrote:
> > I have a question pertaining to my Hy-Gain HG52SS tower or any other
> > tower of this type for that matter. The question: Does anyone have a
> > model or has anyone attempted to model the wind loading of this
> > type of
> > tower, at heights less than full extension? This tower is rated at 9
> > square feet at 50 MPH average wind speed. It would be interesting, to
> > me at least, to see a graph or table stating the increase in wind load
> > capacity as the tower is lowered to its resting height (21 feet.) I
> > asked this question via email directly to Hy-Gain, after their
> > purchase
> > by MFJ, but never received a reply.
> > Thanks for the bandwidth.
> > 73's
> > John Kinney KA7CVJ
> Frank Travanty, W9JCC, has written an Excel spreadsheet and an
> accompanying article which I have used for my TX-472MDP tower. It
> does just what your looking for in terms of allowing you to graph
> your particular installation.
> It takes a bit of data input in terms of your particular tower. You
> will need wind loading figures per section, amount of overlap of
> sections. psi rating of your mast, antenna windloading figures and
> some other data all of which I don't recall since using the sofware.
> Anyway, you end up with a nice graph of height versus wind speed
> maximum for your installation.
> I thought it was very well written and implemented. I have a copy of
> the Word document and the Excel spreadsheet. Contact W9JCC to see
> about getting them. I'm not sure if it's OK for me to send, but with
> his permission, I would be glad to forward a copy of each.
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