[TowerTalk] More Rohn

[Gene Smar]

Wilson:

     I don't have first-hand experience with Blaw-Knox towers but I am aware 
that they make broadcast towers that are very sturdy.  FWIW.


73 de
Gene Smar  AD3F


----- Original Message ----- 
From: "Wilson Lamb" <infomet at embarqmail.com>
To: <towertalk at contesting.com>
Sent: Thursday, January 14, 2010 7:43 AM
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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