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New Delhi: Engineers at NASA’s Jet Propulsion Laboratory (JPL) in Southern California have completed high-speed testing of advanced rotor blades designed for future Mars helicopters. The rotor blades demonstrated the ability to exceed the sound barrier without structural failure. The test was conducted on a test stand within a Space Simulator, that recreates the environment on Mars. The wispy atmosphere of the Red Planet is made up primarily of carbon dioxide, with a sea-level pressure less than one per cent the atmosphere of Earth. Because of the low density, air, the rotors require to spin at extremely high speeds to generate sufficient lift.

Mars has dispatched a rotorcraft to Mars, dubbed Ingenuity, dispatched along with the Perseverance rover. The Mars Helicopter completed 72 flights on Mars between 2021 and 2024, with the final flight ending in a crash. These flights were conducted at close to the aerodynamic limits of the craft, with the rotors spinning at about 2,800 rpm, with the speeds at the tip close to the speed of sound. The new rotor design allows for heavier payloads, longer flight durations and more ambitious missions. Data from the JPL test campaign suggests that the blades maintain their structural integrity even when the tips are moving at supersonic speeds.

Tech supports future Mars Missions

The performance margin can allow future Martian rotorcraft to carry scientific instruments weighing several kilograms, and support crewed mission logistics on Mars. Within the test chamber, near-vacuum conditions are created, with temperature controlled to replicate Mars. High-speed cameras and sensors monitor the behaviour of the blades as rotational velocities increase. The results show no evidence of flutter, divergence of material fatigue, at speeds surpassing previous designs. NASA and industry partners are developing these technologies for future sample return missions and extended exploration of the Martian surface. Rotorcraft on Mars could scout ahead for rovers or map an environment, or prospect for resources.