
I think at one point or another (especially around this time of year) everyone has seen one of the seeds my article is about, slowly gyrating down from the tree tops, or picked up one of this funny looking little one sided wings and dropped it to watch it spin to the ground, but very few people would be able to explain how they work. The purpose of this spinning is to generate lift which is of course why they fall so slow which means more flight time which consequently means the same amount of breeze will disperse these little flying seeds over greater distances. The article is about the people who were recently researching maple seeds and what they learned.
They basically learned that the seeds generate lift almost exactly like a plane does, exploiting a wing shape that forces the air to move more quickly over the top of the wing than it does over the bottom. This causes a lower pressure to be on the top of the wing causing an upward force, generally called lift. The thing that made the seeds really interesting is that when they spin the shape of the seeds generates a vortex, causing the wind speed to be much, much faster generating way more lift. They hope to use this technology to make little itty-bitty Robo-copter, which is in my opinion pretty sweet.
here's a pretty cool clip of a man made bigger version, being spun fast enough that the lift over comes gravity and it flies (for a little bit anyway :] ) autogyrating choppa'