The fundamental design principles behind rotary-wing aircraft date back to the Renaissance, with some of the earliest-known designs belonging to Leonardo da Vinci. Naturally, technology has ...
Historical references to spinning flying machines go back hundreds of years, with evidence like the 12th-century Chinese twirling kite and Leonardo da Vinci's bizarre airscrew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.
When a helicopter's rotor blades approach the speed of sound, things can get a little dicey. Above about Mach 0.8, shock waves, drag, unstable flow, and turbulence can create significant stresses that ...
Engineers at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, have demonstrated that the blades of their next-generation Mars helicopter rotors can punch past the speed of sound and ...
The Ingenuity Mars helicopter has been more successful than anyone dared hope, lasting far, far beyond its originally planned five flights. The little helicopter recently made its 66th flight and has ...
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