NASA makes use of two worlds to check future Mars helicopter designs

For the primary time in historical past, two planets have been residence to testing future plane designs. On this world, a brand new rotor that could possibly be used with next-generation Mars helicopters was not too long ago examined at NASA’s Jet Propulsion Laboratory in Southern California, spinning at near-supersonic speeds (0.95 Mach). In the meantime, the company’s Ingenuity Mars Helicopter has achieved new altitude and airspeed information on the Crimson Planet within the title of experimental flight testing.

“Our next-generation Mars helicopter testing has actually had the perfect of each worlds,” mentioned Teddy Tzanetos, Ingenuity’s undertaking supervisor and supervisor for the Mars Pattern Restoration Helicopters. “Right here on Earth, you could have all of the instrumentation and hands-on immediacy you might hope for whereas testing new plane elements. On Mars, you could have the true off-world situations you might by no means really re-create right here on Earth.” That features a whisper-thin environment and considerably much less gravity than on Earth.

The following-generation carbon fiber rotor blades being examined on Earth are virtually 4 inches (greater than 10 centimeters) longer than Ingenuity’s, with better energy and a special design. NASA thinks these blades may allow greater, extra succesful Mars helicopters. The problem is that because the blade suggestions strategy supersonic speeds, vibration-causing turbulence can shortly get out of hand.

To discover a house large enough to create a Martian environment on Earth, engineers regarded to JPL’s 25-foot vast, 85-foot-tall (8-meter-by-26-meter) house simulator—a spot the place Surveyor, Voyager, and Cassini acquired their first style of space-like environments. For 3 weeks in September, a staff monitored sensors, meters, and cameras because the blades endured run after run at ever-higher speeds and better pitch angles.

“We spun our blades as much as 3,500 rpm, which is 750 revolutions per minute quicker than the Ingenuity blades have gone,” mentioned Tyler Del Sesto, Pattern Restoration Helicopter deputy check conductor at JPL. “These extra environment friendly blades are actually greater than a hypothetical train. They’re able to fly.”

At across the identical time, and about 100 million miles (161 million kilometers) away, Ingenuity was being commanded to strive issues the Mars Helicopter staff by no means imagined they’d get to do.

Fourth rock flight testing

Ingenuity was initially slated to fly not more than 5 instances. With its first flight getting into the mission logbook greater than two-and-a-half years in the past, the helicopter has exceeded its deliberate 30-day mission by 32 instances and has flown 66 instances. Each time Ingenuity goes airborne, it covers new floor, providing a perspective no earlier planetary mission may obtain. However currently, Workforce Ingenuity has been taking their solar-powered rotorcraft out for a spin like by no means earlier than.

“Over the previous 9 months, we’ve got doubled our max airspeed and altitude, elevated our price of vertical and horizontal acceleration, and even realized to land slower,” mentioned Travis Brown, Ingenuity’s chief engineer at JPL. “The envelope enlargement supplies invaluable information that can be utilized by mission designers for future Mars helicopters.”

Restricted by obtainable power and motor-temperature issues, Ingenuity flights often final round two to 3 minutes. Though the helicopter can cowl extra floor in a single flight by flying quicker, flying too quick can confuse the onboard navigation system. The system makes use of a digicam that acknowledges rocks and different floor options as they transfer by way of its area of view. If these options whiz by too quick, the system can lose its manner.

So, to attain a better most floor velocity, the staff sends instructions for Ingenuity to fly at greater altitudes (directions are despatched to the helicopter earlier than every flight), which retains options in view longer. Flight 61 established a brand new altitude document of 78.7 toes (24 meters) because it checked out Martian wind patterns. With Flight 62, Ingenuity set a velocity document of twenty-two.3 mph (10 meters per second)—and scouted a location for the Perseverance rover’s science staff.

The staff has additionally been experimenting with Ingenuity’s touchdown velocity. The helicopter was designed to contact the floor at a comparatively brisk 2.2 mph (1 mps) so its onboard sensors may simply affirm landing and shut down the rotors earlier than it may bounce again into the air.

A helicopter that lands extra slowly could possibly be designed with lighter touchdown gear. So, on Flights 57, 58, and 59 they gave it a whirl, demonstrating that Ingenuity may land at speeds 25% slower than these at which it was initially designed to land.

All this Martian Chuck Yeager-ing is just not over. In December, after photo voltaic conjunction, Ingenuity is anticipated to carry out two high-speed flights, throughout which it should execute a particular set of pitch-and-roll angles designed to measure its efficiency.

“The information can be extraordinarily helpful in fine-tuning our aero-mechanical fashions of how rotorcraft behave on Mars,” mentioned Brown. “On Earth, such testing is often carried out within the first few flights. However that is not the place we’re flying. You must be a bit extra cautious while you’re working that far-off from the closest restore store, as a result of you aren’t getting any do-overs.”