FYI...
Just seems to me your heading for your beam would have to be so accurate into
or away from the wind that it would take a 'perfect world' scenario to have
this happen. And doesn't the wind shift around putting different pressure to
one side or the other of the antenna? I don't think the exercise is worth
whatever gain you might get if there is any.
Terry
KI7M
> On June 7, 2019 at 4:45 PM Steve Maki <lists@oakcom.org> wrote:
>
>
> On 06/06/19 19:18 PM, john@kk9a.com wrote:
>
> > I missed the torque part however I wish someone could explain this in
> > simple terms.
>
> I'll give it a try.
>
> Stick a tennis ball on top of a mast. It creates no rotational torque in
> the wind.
>
> Stick the tennis ball on the side of the mast, it creates torque in the
> wind, like a wind vane.
>
> Picture a balanced boom (balanced for wind...and weight if you like, but
> I don't believe the weight is important for this).
>
> Picture the boom going right thru the mast (ala Telrex elements that
> went thru the boom).
>
> A hypothetical symmetrical wind comes along. The boom does not rotate
> because everything is balanced.
>
> Now move the boom to one side of the mast. The wind will now attempt to
> move the boom *downwind*, IOW, perpendicular to the wind on the downwind
> side of the mast, because of the lever arm created by the distance
> between the mast center and the boom center. Kinda like a weather vane.
>
> Now add a second identical boom to the other side of the mast. Voila,
> things are balanced again for wind force vectors.
>
> I have to say though that it would seem that because of the small lever
> arms involved, this concern is not worth putting much effort into. The
> effect can easily be dwarfed by antennas that are not wind balanced.
>
> -Steve K8LX
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