A lot of birds at that last second before touchdown sweep their wings from back to front creating the wing speed to keep the lift( plus the camber changes and flapping), but it is not sustainable as they have to reach back again which would make them stall; the instinct of perfect timing. The air has to flow over the wing to fly; If you had a plane that had a top speed of 30 mph flying in a 30 mph headwind will be flying at 30 but it wont be making any headway; it will stand still. The helicopter works because the wings are moving even if the speed is not forward, and helicopter aerodynamics are a whole other bag too. Actually the pogo is pretty common with the 3d stuff and a guy in my club has a 3d plane that is designed to do that with a cruciform tail.