Have a quick look at this video, a slope glider no power doing circuits at over 400 mph. go to 4.11 you can see the glider's circuits ...
http://youtu.be/rfoxjNg-eg0 I have flown slope gliders at Otford, one slope back from Stanwell park hang-glider slope, lots of fun, my favorite maneuver was to climb to around 200 meters and out 200 meters and aim for myself, at 50 feet away I would turn the glider on it's side and pull full up elevator, the glider would finish a 180 degree 10 feet in front of me level out and drop softly on the grass at my feet. That glider was a free plan out of Aeromodeller magazine called Bluebottle, we clocked it at 170 kph in straight and level flight.