The tower drawing I have for the LM470 says it's rated at 70MPH Basic wind
speed @EXP"B"(no ice loading).The drawing is dated 4-4-77 Building Code 1991
UBC.
Bob W6TR
----- Original Message -----
From: <K7LXC@aol.com>
To: <towertalk@contesting.com>; <k6zz@ccis.com>
Sent: Monday, December 01, 2008 8:24 PM
Subject: Re: [TowerTalk] LM-470 at 100 MPH
>
> In a message dated 11/30/2008 5:23:02 P.M. Pacific Standard Time, K7LXC
> writes:
>
>> 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.
>
> IMO you're toast. A crank-up will probably survive if it's cranked
> down
> but a stock LM-470 ain't even close. Maybe your engineer can find a
> extended
> height that'll work but it won't be very high.
>
> Cheers,
> Steve K7LXC
> TOWER TECH -
> Professional tower services for hams
>
>
>
>
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