NASA Tests New Rotor Airfoil Designed to Extend Mars Helicopter Flight Range Twenty Fold
NASA researchers have developed an experimental rotor blade cross-section that could allow future Mars helicopters to fly as far as 18.7 kilometers in a single flight, compared with the 0.7 kilometers achieved by the agency's Ingenuity helicopter. The new design, called roamx-0201, uses a thinner, sharper, asymmetrical shape tuned specifically for flight in Mars' thin atmosphere.
Ingenuity made history as the first powered aircraft to fly on another planet. The SkyFall mission, scheduled for launch in 2028, builds on that work with a trio of helicopters bound for Mars. Both missions use a blade with a curved edge reminiscent of but distinct from blades used on Earth. Researchers are now looking beyond SkyFall to designs that could expand single-flight range across the Red Planet.
A team at NASA's Ames Research Center in California's Silicon Valley is working with Imperial College London in the United Kingdom and Nagoya University in Japan to test the new airfoil. Researchers designed roamx-0201 using advanced simulations and algorithms tuned to Mars conditions, which pointed them toward a thinner, asymmetrical shape. Subsequent wind tunnel tests showed the optimized design boosted performance and recovered better in risky flight conditions. The findings were announced in a paper published Sept. 22 in the journal of the American Institute of Aeronautics and Astronautics.
High-fidelity simulation tools compared the roamx-0201 airfoil to Ingenuity's capacity and found the redesigned blades could extend uninterrupted flight distance from 0.7 kilometers to as much as 18.7 kilometers while carrying scientific instruments. The blades performed well in part because they operated longer at higher speeds before experiencing drag divergence, a phenomenon in which performance drops suddenly as the rotors approach the speed of sound, which is lower on Mars than on Earth.
The new blade also differs from earlier designs in how it uses turbulence to create lift. As air flows over a rotorcraft blade, it forms a thin region called the boundary layer. The roamx-0201 airfoil intentionally disrupts the flow of that boundary layer directly at the leading edge, creating a disturbance that counterintuitively pulls the blade upward to lift the rotorcraft more effectively. The design also showed significantly improved behavior at stall, an aerodynamic condition in which performance drops sharply and flight becomes unstable following a change in the angle of airflow. Where Ingenuity's blades experienced steep degradation at stall, the new design, under the conditions studied, could operate safely at a wider range of flight angles.
NASA frames the work as laying the groundwork for helicopters that can fly higher and farther while conducting science on Mars. The tests are helping engineers understand and resolve discrepancies between computational predictions and real-world performance, with the goal of enabling more efficient Mars helicopters that can fly farther, carry more payload, and unlock new science and discovery missions.
The technology is not yet ready for Mars. Ongoing research across NASA continues to refine the designs, and the SkyFall mission remains scheduled for launch in 2028.