Reminds me of the thermal sensor made by High Sky . Hook it up to your
rudder. Zero sink did not move, lift move rudder to left or right, sink
move in opposite direction. Worked pretty well, turn it off and on with
another channel. Really came in handy if you were in zero sink/lift or
very weak lift. I would flip it on to see what was really happening.
Sort of like the varometer in a real sailplane.
A.B.
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