[Antennas] which way the wind blows

[Mike Gilchrist]

Well, I have to vote with Chuck on this one.  On my Oscar array, which is a 
22 element 2 meter and 40 element 70 cm set, when they were broadside to 
the wind, the sail area would cause the antennas to oscillate back and 
forth which I feared would damage the azimuth bearings.  When pointed into 
the wind, the antenna movement was dramatically less.

Of course hurricane Charley took them down, with the tower, and it didn't 
matter WHICH way they were pointed!  :-)

73, Mike kf4fdj


At 09:30 PM 12/16/2004, Chuck O'Neal wrote:
>Umm....the eddies that are set up by pointing the elements into the wind
>will create audible and significant  vibrations that will fatigue the
>element tips and in a year or two, they will break off!  This happened to
>me.  I have found that the best position is to point the boom into the wind
>or 180 deg. Period.  30+  yrs of experience speaks here.  Yes, the elements
>will sway way back in a big wind, but they won't go into that quickly self
>destructive mode.
>
>73,
>Chuck...K1KW
>
>----- Original Message -----
>From: "Chris Boone" <CBoone at earthlink.net>
>To: "'John Luthy'" <jluthy at worldnet.att.net>; <Antennas at mailman.qth.net>
>Sent: Thursday, December 16, 2004 9:16 PM
>Subject: RE: [Antennas] which way the wind blows
>
>
> > Yes, you show always turn the yagi BROADSIDE so the elements are
> > lengthwise into the wind.
> > The wind wont hurt the boom....and the elements will see less swaying
> > due to the fact the crosssection exposed is less.
> > Much like "feathering" a prop on a dead airplane piston engine....
> >
> > Chris
> > WB5ITT
> >
> > > -----Original Message-----
> > > From: antennas-bounces at mailman.qth.net
> > > [mailto:antennas-bounces at mailman.qth.net] On Behalf Of John Luthy
> > > Sent: Thursday, December 16, 2004 10:53 AM
> > > To: Antennas at mailman.qth.net
> > > Subject: [Antennas] which way the wind blows
> > >
> > >
> > > Hello to all,
> > >
> > > My question has to do with protecting my antenna from the wind.
> > >
> > > I have read many times that the antenna should be pointed in
> > > to the wind, and I have seen a rudder on a verry large log
> > > that uses a tower for a boom.
> > >
> > > But on my 6 el. tri bander, I have noticed that I have 6
> > > elements exposed to the wind if I do that, however if I put
> > > the antenna broadside to the wind I only have the boom
> > > exposed to the wind. Now I know the boom has a larger
> > > diameter than the elements. But I am sure the sum of the
> > > diameters of the elements exceeds the boom.
> > >
> > > So here is my question,  Just which way do I aim this thing
> > > to keep it in the air when the santa anas blow?
> >
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>
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