July 7, 2007 - Soaring |
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I haven't been soaring much this year and the weather looked promising
this Saturday so Bruce and I drove out to the
Flying Cow Farm.
Here's a shot of my Schleicher Ka-8. |
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Pretty simple panel. Altimeter, airspeed, vertical speed (two),
and compass. One of the vertical speed indicators has audio
capability. It "chirps" when you're going up. This allows
you to keep your head out of the cockpit. You use the yaw string
on the canopy to keep the glider flying straight, you use the horizon to
gauge your pitch and you listen to the little bird to find the thermals.
"In modern gliders, most electronic variometers generate a sound whose
pitch and rhythm depends on the instrument reading. Typically the audio
tone increases in frequency as the variometer shows a higher rate of
climb and decreases in frequency towards a deep groan as the variometer
shows a faster rate of descent. When the variometer is showing a climb,
the tone is often chopped, while during a descent the tone is not
chopped and the rate of chopping may be increased as the climb rate
increases. The vario is typically silent in still air or in lift which
is weaker than the typical sink rate of the glider at
minimum sink. This audio signal allows the pilot to concentrate on
the external view instead of having to watch the instruments, thus
improving safety and also giving the pilot more opportunity to search
for promising looking clouds and other signs of lift. A variometer that
produces this type of audible tone is known as an "audio variometer".
-- Wikipedia
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The Ka-8 looks kind of boxy, but it thermals pretty well.
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The Ka-8 is not a good photo platform. The canopy is curvy and
there's a lot of glare, which distorts any pictures. Plus, the
glider does not fly "hands-off". For obvious reasons, you like to
stay as high as you can. You do fly close to other gliders, but
you definitely want to be concentrating solely on flying at that point,
not shooting a picture. All this explains why I don't shoot
pictures from the glider very often.
Jan dropped me off in a nice thermal at 2000 feet and I zoomed right up
to 5700 feet. I spent the next two hours having fun thermalling,
doing wingovers and stalls, playing around with the three other gliders
that were up.
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