NASA pushes Mars helicopter rotors past the speed of sound for the first time ever — next-gen “SkyFall” aircraft's rotors hit 3,750 RPM, ten times faster than normal helicopters
…In the tests, which took place under simulated Mars conditions at the historic 25-Foot Space Simulator at NASA’s Jet Propulsion Laboratory (JPL), the rotor systems — one two-bladed and one…
