Has anyone seen/built a ring-wing glider? Not a single ring like the Stovepipe, but one that used a pair of rings (or more properly cylinders). There's a Canadian company selling a hand-launched glider called the "Skyaak" http://skyaak.com/tag/skyaak-ring-wing-glider/. This actually uses two cones rather than two cylinders. About 10 years ago, a member of the local NAR group had built a glider from two carbon fiber cylinders and a carbon fiber arrow shaft. I'd like to duplicate the design (lost contact with original member). I've gathered a lot of stuff to go through from NACA/NASA documents, but would like to hear if anyone else has built something like this, or if they have comments/ideas.