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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