On Thursday, February 4, 2021 at 8:07:31 AM UTC-6, wrote:
I’ve seen these described as an option where you don‘t want to share the TE probe between two varios. However, I can’t find details on them. I’m just curious about how they work (the theory) and how they are plumbed? I know most would use TE probe for one vario and electronic compensation for the other but that’s not an option when using a SN10b. I’m thinking it might be better to use the probe for the 10b alone and the KWEC for the mechanical vario rather than splitting the probe between the two or leaving the mechanical uncompensated.

You can check for the "Wariometr energii całkowitej" paragraph on this website (in Polish - go down slightly beyond the middle of the long page) with an image and explanation:

http://www.plar.pl/szyb/instrum/instrum.htm

A similar explanation found elsewhere on the web and translated by Google says:

"The prototype of KWEC was the Isler compensation box. Schuemann's KWEC (Polish: Kompensator Wariometru Energii Całkowitej - total energy variometer compensator) is a flat, tight box; the two equalizing chambers to which the pressure feeders are connected are separated by a rubber (latex) diaphragm mounted on a spring. As the speed of flight increases, the total pressure increases, and thus the diaphragm bulges, increasing the pressure in the thermos. When the speed drops, the opposite occurs and the pressure in the thermos drops. This way the speed changes in the variometer readings are compensated.
KWEC should be located vertically (diaphragm vertical), and also sideways to the direction of flight (diaphragm parallel to the direction of flight). This eliminates the influence of weight and acceleration.
The disadvantage of this compensation system is the wear of the KWEC rubber diaphragm, which should be replaced after approx. 10,000 cycles. Accurate compensation is difficult to obtain. Additionally, one KWEC must be used for each variometer."