Historical references to spinning flying machines go back hundreds of years, with evidence like the 12th-century Chinese twirling kite and Leonardo da Vinci's bizarre airscrew contraption of 1483.

You can think of a helicopter's top rotor blades as wings – wings capable of varying their pitch to generate more or less lift as they rotate around the main rotor shaft – a concept demonstrated ...

Airbus Helicopters is testing a series of upgrades for the H135 light-twin, including a five-blade main rotor and T-tail design. First detailed by HeliOps magazine in mid-August, the enhancements ...