In article
,
Jim Wilkins wrote:

On Jan 7, 11:45*am, wrote:
On Jan 7, 6:27*am, stryped wrote:

See my antenna description on "Machining Thespians". The rotator
doesn't have to be at the top of the mast. Mine is on the bottom end
where it's accessible. The wind pressure on two ends of the antenna
are fairly well balanced and it doesn't swing out of line unless the
wind is really strong.

Be aware that such a well-balanced antenna still experience aerodynamic
torque from the wind, the torque tending to align the antenna broadside
to the wind.

The search term is Rayleigh Disk acoustic radiometer.

Deep theory: http://www.archive.org/details/acoustictorquesf00kell

Joe Gwinn