[TowerTalk] LM-470 at 100 MPH

[K7LXC at aol.com]

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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