A forum for all things related to Cross Country Soaring - large sailplanes designed for cross country, electronics such as variometers !!
To show my question I did make a short video of the variometer of the ASK18.
This is an analogue TE variometer with ventury and can be combined with airspeed measurement.
The ventury is shaped 30 years ago for this plane and was combined with an older variometer.
You see climbing and sinking at nearly lowest value of speed of 1 inch/sec, when reversing from climbing to sinking and vv you can onserve a deadband, of about 2inches.
In the end two short pulses of air through the ventury to show the effect of lower pressure by speed and the result for the TE compensation, a positive signal. Interrupting this airflow does show a short "fall" signal.