waremark wrote on 11/6/2020 4:58 AM:
"ACD Air Avionics Altimeter and more."

There is also the LXNav Air Data Indicator - combined altimeter and ASI.

With either of these devices, is there any battery backup? Is there a legal requirement for a battery independent system? Do you have to have any instrumentation separate from the flight computer since flight computers can display all of altitude/height, airspeed and vario, and can control radio and transponder?

I contacted Paul Remde of Cumulus Soaring, who also carries the LXNav ADI:

https://www.cumulus-soaring.com/store/lxnav-adi

He says he doesn't have one in stock right now to test, but the manual does not mention an
internal backup battery, so he doubts that it does. His recommendation, and what a lot of us do
already, is two redundant batteries you can switch between. Since the ADI will be my primary
ASI, I may power through two diodes, one to each battery, so no switching is required, and it
will always be powered by the battery with the most voltage.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1