The December 2022 issue of IEEE Spectrum is here!

Close bar

Can a 'Dropship Quadcopter' Deploy Rovers on Mars?

The idea may not be practical (or sane), but the European Space Agency is working on it anyway

2 min read
Can a 'Dropship Quadcopter' Deploy Rovers on Mars?

The most ludicrous way of getting a robot to the surface of Mars is maybe stuffing it inside a giant inflatable bouncy ball and dropping it from a parachute. And that is only slightly more ludicrous than attaching it to a rocket-powered hovercrane (a rocket-powered hovercrane!!!) and then lowering it to the ground with some sort of ridiculous cable contraption.

NASA has done both of these things. Successfully.

So, the bar is very high for finding ludicrous ways of getting robots to the surface of Mars, and the European Space Agency (ESA) has taken on the challenge with a quadcopter that can safely drop a rover down onto the Martian surface while hovering.

This is a combination of navigation software and hardware (GPS plus inertial systems, followed by vision-based navigation, a laser range finder, and a barometer), and visual hazard avoidance: the quadcopter is actively avoiding perceived obstacles (big pointy rocks and such) to find a nice, clear, flat, happy place to set down its rover cargo, using a 5-meter-long bridle.

You can think of this system as a combination of NASA's Morpheus lander, which has autonomous obstacle avoidance for landing site selection:

And this system from Japan, which is designed to deploy small rovers into (or next to) volcanoes:

Now, no matter what the ESA says in its press release, we don't want you to get the idea that this thing is now ready to fly off to Mars, rover in tow. There's a reason that NASA went with rockets and not rotors. I mean, there are probably lots of reasons, but one of them is that Mars doesn't have much atmosphere: the pressure at "sea level" on Mars (which is the average radius of the planet, Mars not currently being in possession of any seas) is about one-hundredth the atmospheric pressure at sea level on Earth.

And since things like helicopters depend on thrusting air downward to keep themselves up, you're going to need some ludicrously long blades (or a huge number of small ones) to physically move enough atmosphere to remain airborne. The reduced gravity (a little over a third of that on Earth) will help substantially, but it's still not a proven approach. This page from Georgia Tech provides more detail on how bad of an idea this is, and suggests flapping wings as a substitute (although I think it's research from 2001-ish).

What's most relevant here is the software that the team developed to navigate and detect hazards, because it can (presumably) be adapted to other flying platforms, like rocket cranes, or something more exotic, like maybe something based on a balloon. Or an anti-gravity hovership. The ESA has those, right?

[ DFKI ] via [ ESA ]

The Conversation (0)

The Bionic-Hand Arms Race

The prosthetics industry is too focused on high-tech limbs that are complicated, costly, and often impractical

12 min read
A photograph of a young woman with brown eyes and neck length hair dyed rose gold sits at a white table. In one hand she holds a carbon fiber robotic arm and hand. Her other arm ends near her elbow. Her short sleeve shirt has a pattern on it of illustrated hands.

The author, Britt Young, holding her Ottobock bebionic bionic arm.

Gabriela Hasbun. Makeup: Maria Nguyen for MAC cosmetics; Hair: Joan Laqui for Living Proof

In Jules Verne’s 1865 novel From the Earth to the Moon, members of the fictitious Baltimore Gun Club, all disabled Civil War veterans, restlessly search for a new enemy to conquer. They had spent the war innovating new, deadlier weaponry. By the war’s end, with “not quite one arm between four persons, and exactly two legs between six,” these self-taught amputee-weaponsmiths decide to repurpose their skills toward a new projectile: a rocket ship.

The story of the Baltimore Gun Club propelling themselves to the moon is about the extraordinary masculine power of the veteran, who doesn’t simply “overcome” his disability; he derives power and ambition from it. Their “crutches, wooden legs, artificial arms, steel hooks, caoutchouc [rubber] jaws, silver craniums [and] platinum noses” don’t play leading roles in their personalities—they are merely tools on their bodies. These piecemeal men are unlikely crusaders of invention with an even more unlikely mission. And yet who better to design the next great leap in technology than men remade by technology themselves?

Keep Reading ↓Show less