On Monday, September 26, 2016 at 11:35:58 AM UTC-4, krasw wrote:

Never heard of anyone not having a mechanical vario in glider.

I haven't had a mechanical in years. I have a B400 for backup (with AA back up battery pack) but it hasn't been switched on for more than a functional check in about 4 years (the last time I got out to the airport and discovered my batteries hadn't come with me).

Mechanical varios don't play well with modern pressure transducer type varios and should not share TE sources with them.

Evan Ludeman / T8