- NASA stowed a solar-powered helicopter in the belly of its Perseverance rover, set to land on Mars on February 18.
- The helicopter, called Ingenuity, aims to conduct the first-ever controlled flights on another planet.
- Ingenuity and Perseverance will both record video as the drone flies over an ancient Martian lakebed.
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A space helicopter is speeding toward Mars, tucked in the belly of NASA’s new Perseverance rover.
Perseverance will be NASA’s fifth rover to Mars, but its miniature-helicopter stowaway â€” called Ingenuity â€” will be the first spacecraft of its kind.
The robots are set to land in an ancient Martian lakebed called Jezero Crater, where Perseverance may find signs of alien life, on February 18. A few months after landing, the rover is programmed to lower Ingenuity to the Martian surface, back away, and watch as the tiny drone carries out a series of test flights.
If successful, these will be the first controlled flights ever conducted on another planet.
Ingenuity is just a technological demonstration â€” one that has cost NASA about $US85 million â€” but it could kick off a new approach to exploring other planets.
“In the future, it could transform how we do planetary science on these other worlds, and eventually be a scout so that we can figure out where exactly do we need to send our robots,” NASA Administrator Jim Bridenstine said in a press briefing before the rover’s launch in July 2020.
As with any pioneering technology, especially in space, Ingenuity faces challenges that could undermine its mission. The helicopter’s internal heaters will have to keep it warm through frigid Martian nights, when it gets as cold as negative 130 degrees Fahrenheit.
Since nobody has ever flown on Mars, unknown factors could thwart Ingenuity’s attempts. Just last month, another pioneering Mars technology â€” a “mole” on NASA’s InSight lander, meant to hammer deep into the planet’s crust â€” was unable to complete its mission when unexpectedly thick soil stopped it in its tracks.
“The helicopter Ingenuity is a high-risk, high-reward endeavour,” Matt Wallace, the Perseverance deputy project manager at NASA’s Jet Propulsion Laboratory, said in a briefing last week. “There’s always going to be some probability of an issue. But that’s why we’re doing it. We’ll learn from the issue if it occurs.”
If Ingenuity survives and flies, here’s what to expect.
The first drone footage from Mars
Even for a 4-pound rotocraft like Ingenuity, the thin Martian atmosphere makes flying difficult. The air has just 1% of the density of Earth’s atmosphere.
“The first and foremost challenge is to make a vehicle that’s light enough to be lifted,” MiMi Aung, who leads the helicopter project at NASA’s Jet Propulsion Laboratory, explained in a video about the spacecraft. “The second is to generate lift.”
To catch enough air, the helicopter’s four carbon-fibre blades have to spin in opposite directions at about 2,400 revolutions per minute â€” about eight times as fast as a passenger helicopter on Earth. To power all that spinning, solar panels on top of the spacecraft will soak up the sun’s energy.
“It’s a balance of a very light system, yet having enough energy that’s needed to spin the rotors so fast to lift, and on top of it having to design in the autonomy,” Aung said.
Because communicating with spacecraft on Mars takes a few minutes, ground controllers on Earth can’t direct Ingenuity’s flight in real time. So engineers have designed and programmed the helicopter to carry out up to five flights autonomously, within a span of 30 Martian days (roughly one Earth month).
The first flight will just test that the helicopter can get off the ground and hover about 10 feet in the air. From there, each test will be more difficult than the last, culminating in a final flight that could carry the helicopter over 980 feet (300 meters) of Martian ground.
Two cameras on the underside of the drone will capture footage of the Martian surface below â€” one in colour, and one in black and white.
Perseverance will look on with its own cameras, allowing the helicopter and the rover to record each other.
“Imagine looking from Perseverance out at a helicopter that is flying around Perseverance, and the helicopter is looking back at Perseverance getting us images of what Perseverance is doing,” Bridenstine said in the press briefing. “We’re going to be able to see with our own eyes, with motion pictures, these kind of activities happening on another world. And I just can’t tell you how excited I am.”
NASA already has plans to send at least one helicopter to another world beyond Mars: A mission planned for 2026 would send a nuclear-powered rotocraft to search for alien life on Saturn’s largest moon, Titan.
“What’s really most important is everything we’re learning here is for the future rotocraft systems that we want to introduce into space exploration,” Aung said.
Getting the helicopter to Mars requires a ‘magic trick’
NASA’s Associate Administrator, Thomas Zurbuchen, proposed the helicopter late in the rover’s design. But the team behind the machine was excited about the idea.
“I told Thomas, whatever you can do to make that happen, I’m all for it,” Bridenstine said.
By that time, the top of Perseverance was already full of instruments and equipment. There was very little room to squeeze in a whole new machine.
“Kind of late in the game, we were asked to accommodate this little thing called the Mars helicopter,” Wallace said in the pre-launch briefing. “We had to do a little bit of a magic trick to get that one on the rover. We pulled a bit of a rabbit out of the hat.”
Since the underside of the rover had a stretch of free panel, engineers tucked the light, compact helicopter inside.
Lockheed Martin, one of NASA’s contractors, built the system that will lower Ingenuity to the Martian ground. Around two months after it lands, Perseverance will drop the shield that covers the helicopter. The rover will then drive to whichever flat, debris-free field the mission’s managers select for flying Ingenuity.
After six days of checking out all the robot’s systems, mission managers will send the signal to release the helicopter. A small electric motor, a spring-loaded arm, and a pyrotechnic device will slowly twist Ingenuity away from the rover into an upright position, then drop the drone 5 inches to the ground.
The 19-inch-tall helicopter will have about 26 inches of clearance below the rover’s belly.
For now, this complex delivery system lies in wait as it travels the final miles to its destination.
This post has been updated with new information. It was originally published at 1:26 p.m. EST on August 6, 2020.