[TowerTalk] LM-470 at 100 MPH

[Bob Selbrede, K6ZZ]

You bet.  There are plenty of VERY windy areas in
California.  This area is just east of the Sierra Nevada
mountains and is typically windy.  We frequently have 30-50
MPH winds but rarely anything over 70 MPH.  The County
however has decided to bump the Basic Wind Speed up from 80
MPH to 100 MPH for this area.

Bob

----- Original Message Follows -----
From: RICHARD SOLOMON <w1ksz at q.com>
To: TowerTalk <towertalk at contesting.com>
Subject: Re: [TowerTalk] LM-470 at 100 MPH
Date: Sun, 30 Nov 2008 03:46:52 +0000

> 100 MPH winds ??? In California ?? They expecting Global
> Warming to cause Typhoons to hit ??
>  
> 73, Dick, W1KSZ> From: k6zz at ccis.com> To:
> bmaser at tampabay.rr.com; towertalk at contesting.com> Date:
> Sat, 29 Nov 2008 19:40:22 -0800> Subject: Re: [TowerTalk]
> LM-470 at 100 MPH> > 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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