NASA engineers say new rotor breakthrough could enable supersonic helicopter flight

NASA engineers have pushed experimental Mars helicopter rotors past the speed of sound, a breakthrough that could eventually ...
Ars Technica

Engineers at NASA’s Jet Propulsion Lab make a breakthrough in rotor technology

A little more than three years since NASA’s Ingenuity helicopter ended its pioneering mission at Mars, engineers at the Jet Propulsion Laboratory in California are designing next-generation Martian ...