New Mars Helicopter Blade Could Fly 18.7 Kilometers in One Go, Simulations Show

NASA researchers say a redesigned rotor blade could let future Mars helicopters fly much farther on a single flight than Ingenuity did. In computer simulations, the new design could stretch the distance covered in one uninterrupted flight from Ingenuity's 0.7 kilometers to as much as 18.7 kilometers, while carrying scientific instruments, NASA reported.

The work is so far limited to simulations and wind tunnel tests. NASA said the technology is not yet ready for Mars.

What did the researchers design?

A team at NASA's Ames Research Center in California's Silicon Valley worked with Imperial College London and Nagoya University in Japan on a new blade cross-section, known as an airfoil. It is called roamx-0201.

The researchers used advanced simulations and algorithms tuned to Martian conditions. Those tools pointed them toward a thinner, asymmetrical shape. According to NASA, later wind tunnel tests showed the optimized design performed better and recovered more readily in risky flight conditions.

How does it differ from Ingenuity's blades?

NASA said both Ingenuity and the upcoming SkyFall mission use blades built for Mars' thin atmosphere, with a curved edge that resembles, but is distinct from, blades used on Earth. The new design goes further, with thinner and sharper blades.

It also handles airflow differently. Air moving over a blade forms a thin layer called the boundary layer. The new airfoil deliberately disrupts that layer right at the front, or leading edge. NASA said this creates a disturbance that, counterintuitively, pulls the blade upward and helps lift the aircraft more effectively than earlier designs.

Why can the new blade fly farther?

NASA pointed to two main advantages. The first involves a problem called drag divergence, in which performance drops suddenly as the rotors approach the speed of sound. That speed is lower on Mars than on Earth. The roamx-0201 blades could operate longer at higher speeds before this happened.

The second involves stall, a condition in which performance falls sharply and flight becomes unstable after a change in the angle of the airflow. Ingenuity's blades degraded steeply at stall. Under the conditions studied, NASA said, the new design showed significantly improved stall behavior, meaning future helicopters could operate safely across a wider range of flight angles.

How solid is the result?

The findings were announced in a paper published Sept. 22 in the journal of the American Institute of Aeronautics and Astronautics. The 18.7-kilometer figure comes from high-fidelity simulations that compared the new blade with Ingenuity's capabilities, not from a flight on Mars.

NASA said the tests are also helping engineers understand and resolve differences between computer predictions and real-world performance. That suggests the models are still being refined against physical results.

Why does it matter?

Ingenuity was the first powered aircraft to fly on another planet. Longer flights would let a helicopter cover more ground in one trip, which could widen what future missions are able to study on the Red Planet.

NASA said ongoing research across the agency aims to produce more efficient Mars helicopters that can fly farther, carry more payload and enable new science and discovery missions. For readers, the news is a sign of where Mars aircraft design is heading, not a change to any mission already planned.

What comes next?

The SkyFall mission, scheduled to launch in 2028, will send a trio of helicopters to Mars. NASA said the new blade research targets missions after SkyFall. The agency did not give a timeline for when a design like roamx-0201 might fly on Mars.

Source: NASA