Aug 29, 2017 - 10:28 PM
I've never seen sailplanes in the interlaken area. The nearest airfield is the military base at Meiringen and they might exclude sailplanes from the nearby air space. There are gliding centres in Mollis, Winterthur, Hausen am Albis, Lommis, Amlikon, Sitterdorf, Schänis, Buttwil, Birrfeld and Speck, but I haven't flown from any of them, so I don't know what sort of facilities they have. Given the geography, I assume most gliding in Switzerland would be orographic, with not much thermaling. Launching appears to be a mix of aero tug and cable.
Hope this helps