Note: Single-source report; awaiting corroboration.
NASA's next-generation Mars helicopter rotor blades have been tested at speeds exceeding Mach 1 in a specialized chamber simulating the Red Planet's atmosphere, according to NASA Jet Propulsion Laboratory (JPL) data. The tests showed that the rotor blade tips can travel faster than the speed of sound without structural failure.
The 137 test runs support engineering designs for aircraft capable of carrying heavier payloads, including scientific instruments, advancing Mars aerial exploration beyond the technology demonstrated by the Ingenuity Mars Helicopter.
Ingenuity, the first powered, controlled aircraft on another planet, was a technology demonstration and did not carry scientific payloads. Future projects, such as the SkyFall initiative, aim to leverage new rotor capabilities for low-altitude data collection on upcoming human and robotic missions.
Since Mars' atmosphere is only about 1% as dense as Earth's, producing enough lift requires rotor blades to reach tip speeds near or beyond the sound barrier, a challenge not faced by Earth-based helicopters. NASA engineers have adopted an aggressive rotor design to address this, unlike Ingenuity, which limited rotor speeds during its 72 flights to avoid exceeding Mach 1 and the associated complexities.
Al Chen, Mars Exploration Program manager at JPL, notes these advances are essential because flying on Mars combines the difficulty of generating lift in a thin atmosphere with significant gravity, making sustained flight particularly challenging.