Chris,
You can learn about the Winter Variometer via a Google Search. They are
made in Germany, in several forms. If I understand correctly, one side
of the internal aneroid is vented to static pressure directly and the
other is vented through a bottle of a specified size. This means that
one side is damped, while the other reacts quickly, providing a needle
indication of the change in pressure.
I used the same principle to locate the shock wave position in the
diffuser of a large supersonic wind tunnel. We designed and installed a
small "tank" that contained a sensitive pressure transducer, with one
side of the transducer connected directly to a static orifice in the
diffuser wall, and the other side vented to the tank, which was itself
vented to a diffuser wall orifice. We placed a row of these devices
down one side of the diffuser, and connected them to a display that
reacted to the pressure difference measured by each device. Once flow
was established, the signals ahead of the shock were steady, while those
downstream were very active. We could actually observe the shock
movement during the process of establishing supersonic flow in the test
section.
Too much said about another life...........................
Jim Nichols
Tullahoma, TN USA
On 5/31/2015 1:04 AM, ChrisB wrote:
Thanks, Jim. Yes, one is a VSI (on the left, presumably feet per minute) and
the other an indication of vertical speed in knots. I never understood how the
latter worked, nor exactly why the pilot might need it.
Chris
On 30 May 15, at 19:07, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
Link:
http://www.gallery.leica-users.org/v/OldNick/Sailplane+Instruments.jpg.html
Jim Nichols
Tullahoma, TN USA
On 5/30/2015 1:05 PM, Jim Nichols wrote:
Chris, I tried to get as sharp an image as possible, but there isn't much to
see. From some on-line searching, I gather that sailplane pilots like to have
variometers that show both the vertical speed of a rising thermal column and
the vertical speed of the aircraft. Maybe that information is provided by these
instruments, but the details have to be in the head of the pilot.
Neither of these is a g-meter. I think the markings give vertical speed in
knots.
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