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 three-bladed — reached rotor tip speeds of up to Mach 0.98 before additional headwinds pushed the blades to Mac… …