[TowerTalk] HF beam against the wind.

DavisRFinc@aol.com DavisRFinc@aol.com
Mon, 10 Nov 1997 02:47:04 -0500 (EST)

Hi Roger, as my first input to TT, I hope this answer doesn't sound short or
presumptuous.  Do beams have more than one wind  load specification?  Yes;
however the industry assumes that the max. load spec is what is most
important, which I agree with.  Yes, you're right that the spec is intended
to be the one measured with elements broadside to wind direction.  Yes,
there's an empirical answer to this question which , in part, is based on one
of Einstein's theories correlated with vector analysis and basic wind loading
computations.  Rather than trying to convey formula symbols that may not
resolve through E mail, suffice it to say that when one wades into the heavy
surf of the ocean, many of us turn sideways to the wave force, unless we are
wearing hi impact polymer groin protection.   Pictures, images in our mind
and excrutiating pain often substitute for scientific equaltions.
Regards,  Steve, K1PEK

DAVIS RF Co., Commercial wire/cable, RF connectors, custom cable design.  BURY
-FLEX  low loss HF-microwave coax;  FLEX-WEAVE  aerial wire.  Registered
trademarks of Davis Associates, Inc.


 Most of the time I believe we only see one
 spec.... which I'll go out on a limb and ASSUME is the one measured
 when the elements are broadside to the wind.  But, if you park the beam
 perpendicular to the wind.... is not the wind load REDUCED because so
 much less tubing surface is being impinged upon by the on-rushing air? >>
Can anyone address this issue with number specifics rather than...
"this is what I do... or didn't do and look what happened."  Please,
please.. don't get me wrong.  I AM NOT DISCOUNTING PERSONAL EXPERIENCE!
 It is usually valid and reasonable.  I'm just looking for some
numerical justification to all that wonderful experience.  
Thanks.his is a question
PHYSICS CAN ANSWER... but like so many things about this wo

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