Human Powered Composite Helicopters

Bowen-Davies and dozens of his fellow students from the University of Maryland are chasing one of aviation’s last milestones: the Sikorsky Prize. The American Helicopter Society (AHS) has promised $250,000 to the team that can build a human-powered helicopter. All it has to do is hover for a minute, reach a height of 3 metres (about 10 feet), and stay in a 10-metre box.

[via: npr]