Rc gliders do it behind a ridge, taking advantage of big wind speed differences caused by the ridge. It's pretty fantastic to see in a video or in real life. B

Rc gliders do it behind a ridge, taking advantage of big wind speed differences caused by the ridge. It's pretty fantastic to see in a video or in real life. But I'm not sure whether it translates to generalized flying at high altitude - is there enough windshear without a close-by hill for this to work? Can it work in any direction?