its blades need to be enlarged — sometimes to a ludicrous degree. The Hughes XH-17 was an experimental helicopter intended to test a tip-jet-powered rotor system. It wasn't custom-built from the ...

The tourist helicopter that crashed into the Hudson River on Thursday afternoon appears to have fallen victim to a well-known ...

The only evidence at this point in the investigation is eyewitness accounts and bystander video, both of which suggest that the helicopter’s rotor blades ... Airlines jet and an Army helicopter ...