It was way back in May 2010 that I first spotted the flying drones that will take over the world. They were in a video that Daniel Mellinger, one of the robots’ apparently too-trusting creators, proudly posted on YouTube. The clip, titled “Aggressive Maneuvers for Autonomous Quadrotor Flight,” depicts a scene at a robotics lab at the University of Pennsylvania, though a better term for this den might be “drone training camp.”
In the video, an insectlike, laptop-sized “quadrotor” performs a series of increasingly difficult tricks. First, it flies up and does a single flip in the air. Then a double flip. Then a triple flip. In a voice-over so dry it suggests he has no idea the power he’s dealing with, Mellinger says, “We developed a method for flying to any position in space with any reasonable velocity or pitch angle.” What does this mean? It means the drone can fly through or around pretty much any obstacle. We see it dance through an open window with fewer than 3 inches of clearance on either side. Next, it flies and perches on an inverted surface—lying in wait.
In a series of videos Mellinger posted throughout that summer, we see the robot learn even more terrifying skills. It pirouettes in an ellipse. It gets a “claw-like” gripper that allows it to pick up objects, and then it learns to “cooperate” with other drones and pick things up together. It learns to land on surfaces, and to recover when its landing attempts fail; this, along with an added camera, gives it the ability to conduct “autonomous surveillance.” It figures out how to fly through several obstacles in a row and then, amazingly, through moving obstacles—it slips through a Hula Hoop that Mellinger throws up in the air. About a year ago, Mellinger posted a video showing a team of three drones building structures out of large metallic beams. The machines fly in a terrifying, coordinated ballet, each of them picking up a beam, finding the exact spot where it should be placed, and gingerly snapping the object in place.
Stare at this long enough and you could mistake the scene for something adorable—birds building a nest. But by this time you’ve stopped staring. Instead, you’ve opened another browser tab to look for good deals on bomb shelters and MREs.
Over the last couple years, videos like these ones from UPenn have become a mainstay of science and tech blogs. Every few weeks, there’s a new one showing drones swarming, mapping, surveilling, building, and generally wowing us with ever greater powers. Many of these flying objects are built by grad students at robotics labs, often in preparation for the International Aerial Robotics Competition. (That tournament will take place in North Dakota this summer.) The mission of this year’s competition: build a drone that can silently enter a heavily guarded, Osama Bin Laden-like compound and remove a USB flash drive from the top of an officer’s desk.
At the same time, a vibrant hobbyist community has emerged around drones. DIYDrones—founded by Wired editor and accomplished drone-maker Chris Anderson—collects pictures, videos, and how-tos from hundreds of amateurs around the world. The site suggests that making drones has become the world’s best geeky dad-and-kid hobby, the modern take on model airplanes and backyard rockets.
If this were a popularity contest, the UPenn team’s bots would have long ago sealed up the top spot. Altogether, the clips on Mellinger’s YouTube channel have been viewed 10 million times. This week, the UPenn quadrotors were given their widest, geekiest audience yet: They were featured in an irresistible TED presentation by professor Vijay Kumar, who directs the UPenn lab. Near the end of the TED talk, the team shows off an experiment that I suspect was designed to prove that these robots aren’t scary—but that ends up being the most horrifying thing of all. Together, the bots use specially modified musical instruments to play the James Bond theme.
What makes autonomous drones simultaneously irresistible and alarming? To me, it’s that we’re witnessing the evolution of what could be the perfect form of locomotion. The UPenn lab’s newest robots—created by Mellinger and another grad student, Alex Kushleyev—are called “nano quadrotors,” because they’re only 8 inches in diameter. As Kumar explained at TED, the physical equations governing the angular inertia of objects favor small size—the smaller you make a bird, the faster it can turn in the air. That means the nano drones are incredibly agile.
In addition, they’re built to automatically, instantly collaborate in the air. The behavior is modeled after insects like ants—it happens without a central coordinator, via the drones’ ability to sense their distance from one another as they fly. In a video Mellinger posted in January—his most popular one yet—16 nano quadrotors transition between a series of incredible formations. They look like synchronized swimmers, only more nimble.
Over the last few months, as drones have become easier to make and to buy, they’ve raised privacy alarms. People are using them to monitor traffic, spy on celebrities, take aerial real estate photos, and—thanks to a new federal law that legalizes their flight—almost certainly in a variety of law enforcement missions. The nano drones’ two key features—extreme agility and instant swarming—would seem to raise the stakes in this debate.