Tom's Hardware on MSN
NASA pushes Mars helicopter rotors past the speed of sound for the first time ever
Rotors spin 10 times faster than modern helicopters.
Supersonic milestone: NASA’s new Mars helicopter rotors reached Mach 1.08 in testing, breaking the sound barrier for the ...
NASA has tested Mars helicopter blades that reach supersonic tip speeds, a major step toward more capable rotorcraft for ...
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