National Geographic : 2003 Dec
Part helicopter, part airplane, the V-22 Osprey flies again at the Patuxent River Naval Air Station in Maryland, where it's being tested after a redesign. Two fatal crashes in 2000 grounded the Osprey and were a sober reminder that aerial innovation is not without risk. Known as a tilt-rotor, the V-22 takes off vertically, then tilts its engines forward for winged flight. Advocates claim it provides twice the speed, three times the payload, and five times the range of the helicopters it's meant to replace.