[TowerTalk] wind load

[jimlux]

Tom Osborne wrote:
> Hi Rex et al
> 
> Yeah, but for how long?
> 
> I've always wondered if that is a sustained 70 mph wind for 5 hours or a 
> gust or 2 at that speed.  73
> Tom W7WHY
> 

Shouldn't make any difference. The analysis is for static loads, not 
dynamic.

However, a "sustained 70 mi/hr wind" will likely have gusts that are 
stronger.

This is recognized in standard weather data with terms like "fastest 
mile wind speed".  Fortunately, you don't have to try to derive this 
stuff from first principles.  The TIA spec (and numerous antenna 
websites) give the "rating wind speed" on a county by county basis, and 
you just plug that into the mfrs formula.