Re: Noah called, he wants his units back.
"No, in aeronautics you use USian measurements. Feet for altitude, pounds for thrust etc, etc"
In gliding, the units used are metric. (Probably something to do with the fact that gliding was developed as a sport mainly in Germany).
Competitive classes are distinguished by wingspan (13.5m, 15m, 18m, 20m, unlimited (also metric)) and MTOW (525, 600, 750, 850 kg). Instrumentation is very often (though not in the US), metric.
Good luck to the perlan group, but do not believe that anything Airbus but money is involved.
by the way: the goal of the project is to explore the upper reaches of mountain waves. So far the limits for these vertical air-movements have not been established in detail.