Somewhere on my HD I have a copy of a page from an earlier Rohn Catalog
showing the maximum permissable unguyed height vs windload. Then the
Accountants and Lawyers got in the act.
If I find it I will make it available.
73, Dick, W1KSZ
> From: infomet@embarqmail.com
> To: towertalk@contesting.com
> Date: Thu, 14 Jan 2010 07:43:42 -0500
> Subject: [TowerTalk] More Rohn
>
> Trying again on this post...
>
> Well, I have enjoyed studying all the thoughtful replies to my questions
> about 25G and its installation. Thanks.
> Funny thing, though. I don't KNOW any more than before.
> Some people don't go above a guypoint at all. They install temporaries on
> every section when it goes up.
> Other people routinely work 20-30 feet above the last guys!
> I got a pretty good windload analysis from a vendor site, covering BX tower,
> but nothing on 25G loading.
> Rohn says 25G is not self supportiing, at all, but I have in my hand a
> drawing of a Rohn "Self Supporting Base Plate"!!
>
> SO, keep 'em coming. I'm sifting all the data to decide what I want to do.
> It's obvious that 25G is a strong tower that can do way more than they say.
> I'm not trying to cut corners and be unsafe, but would like to know the real
> structural responses in a real tower. Maybe I should use some of my
> considerable experience with strain gages!
>
> What I really want, of course is a spreadsheet or drawing giving windload,
> bending, and shear at all points on a 70' stick of 25G! Who knows, I may
> have to buckle down and do it myself.
>
> Does anyone have experience with Blaw Knox? A friend has 60' standing up in
> his yard for me to take if I want it. It's VERY heavy, 2-3 times 25G
> although about the same size as 25G. The joints are plates with several
> bolts at each leg, not telescoping like Rohn. I know it's at least 50 yr
> old, and probably a good bit more!
>
> This message has been scanned for netiquette problems.
> 73,
> Wilson
> W4BOH
>
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