Video showing the smoke trail left after a U.S. Global Hawk unmanned aerial vehicle was shot down over the.
Human Powered Helicopter Prototype
Colin Gore, a PhD student in materials science at the University of Maryland, carefully hooks his bike shoes into the cranks of a motor-less helicopter. He sits in the spider-like machine's central hub, surrounded by four delicately engineered carbon fiber arms, each of which supports a super-light rotor. The machine spans the length of a basketball court, yet it weighs only 75 pounds. With Gore's slim frame in place, it now weighs 210 pounds. And it's ready for flight. In a reclined position, Gore grips the helicopter's hand cranks and begins to move his hands and feet like the pistons of a four-stroke engine. Slowly, as the motion of his arms and legs reels in a line attached to each of the four rotors, pairs of the helicopter's blades begin to spin in opposite directions. Moments later, Gore is doing what has been dreamed about for centuries: He is flying a human-powered helicopter. More than that, though, he is breaking a world record. The man-and-machine combination hovers a foot or two above the ground -- as if dangling on a string -- for 40 seconds, the longest amount of time such a feat has been accomplished. Feel free to read more about it http://www.theatlantic.com/technology/archive/2012/06/human-powered-helicopters-a-600-year-old-dream-in-sight/258785