[TowerTalk] LM-470 at 100 MPH

[Bob Selbrede, K6ZZ]

Obviously true, however the building department won't look
at it that way.  They'll want to see an
analysis/certification showing the conditions under which
the structure will meet the wind loading requirements.  They
may accept my committment to "keep it cranked down when the
winds are up", but I suspect not.  I'll find out soon
enough.

Bob  

----- Original Message Follows -----
From: "Bob Maser" <bmaser at tampabay.rr.com>
To: <k6zz at ccis.com>, <towertalk at contesting.com>
Subject: Re: [TowerTalk] LM-470 at 100 MPH
Date: Sun, 30 Nov 2008 02:50:01 -0000

> Anybody that leaves a crankup tower up in 100mph wind
> potential deserves to  lose it.  I guarantee you that a
> LM470 cranked all the way down will not be  blown down in
> any wind.  Of course, the elements will be stripped off
> the  boom long before, then goes the boom.
> 
> Bob W6TR
> ----- Original Message ----- 
> From: "Bob Selbrede, K6ZZ" <k6zz at ccis.com>
> To: <towertalk at contesting.com>
> Sent: Sunday, November 30, 2008 1:32 AM
> Subject: [TowerTalk] LM-470 at 100 MPH
> 
> 
> > Hello,
> >
> > Has anyone had the Triex LM-470 professionally evaluated
> > for antenna load capacity in a 100 MPH Basic Wind Speed
> > zone? Turns out our local building code will be changing
> > on 1 Jan 09 to require new structures to meet the 100
> > MPH requirement.  I suspect most free standing crankup
> > towers, fully extended, may not handle these wind
> > conditions unloaded let alone with a good size tribander
> > on them.  How does an 85 MPH 3 second gust rating of 18
> > Sq Ft look at 100 MPH?  I would estimate around 4 Sq Ft.
> >
> > 73, Bob K6ZZ
> >
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