NASA’s Mars helicopter blades broke the sound barrier without disintegrating, and JPL may have unlocked the next leap in alien flight

NASA engineers spun next-gen Mars helicopter blades past Mach 1 without shattering them. See how JPL unlocked the future of ...
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NASA's Next-Gen Mars Helicopter Rotors Have Broken The Sound Barrier in Tests

A rendering of the mid-air deployment of one of the SkyFall copters. (NASA Jet Propulsion Laboratory/AeroVironment, Inc.) ...