- NASA pushes Mars helicopter rotor blades beyond Mach 1 in testing AeroTime
- NASA Pushes Next-Gen Mars Helicopter Rotor Blades Past Mach 1 NASA (.gov)
- Engineers at NASA’s Jet Propulsion Lab make a breakthrough in rotor technology Ars Technica
- NASA tests confirm next-generation Mars rotors can safely break the sound barrier Interesting Engineering
- NASA confirms Mars helicopters could survive Mach 1.08 to boost lift by 30 percent Yahoo Tech