War Evolves With Drones, Some Tiny as Bugs (New York Times):
Two miles from the cow pasture where the Wright Brothers learned to fly the first airplanes, military researchers are at work on another revolution in the air: shrinking unmanned drones, the kind that fire missiles into Pakistan and spy on insurgents in Afghanistan, to the size of insects and birds.
The base’s indoor flight lab is called the “microaviary,” and for good reason. The drones in development here are designed to replicate the flight mechanics of moths, hawks and other inhabitants of the natural world. “We’re looking at how you hide in plain sight,” said Greg Parker, an aerospace engineer, as he held up a prototype of a mechanical hawk that in the future might carry out espionage or kill.
Half a world away in Afghanistan, Marines marvel at one of the new blimplike spy balloons that float from a tether 15,000 feet above one of the bloodiest outposts of the war, Sangin in Helmand Province. The balloon, called an aerostat, can transmit live video — from as far as 20 miles away — of insurgents planting homemade bombs. “It’s been a game-changer for me,” Capt. Nickoli Johnson said in Sangin this spring. “I want a bunch more put in.”
From blimps to bugs, an explosion in aerial drones is transforming the way America fights and thinks about its wars. Predator drones, the Cessna-sized workhorses that have dominated unmanned flight since the Sept. 11, 2001, attacks, are by now a brand name, known and feared around the world. But far less widely known are the sheer size, variety and audaciousness of a rapidly expanding drone universe, along with the dilemmas that come with it.
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“What it’s doing out here is nothing special,” said Dr. Parker, the aerospace engineer. The researchers are using the helicopter to test technology that would make it possible for a computer to fly, say, a drone that looks like a dragonfly. “To have a computer do it 100 percent of the time, and to do it with winds, and to do it when it doesn’t really know where the vehicle is, those are the kinds of technologies that we’re trying to develop,” Dr. Parker said.
The push right now is developing “flapping wing” technology, or recreating the physics of natural flight, but with a focus on insects rather than birds. Birds have complex muscles that move their wings, making it difficult to copy their aerodynamics. Designing insects is hard, too, but their wing motions are simpler. “It’s a lot easier problem,” Dr. Parker said.
In February, researchers unveiled a hummingbird drone, built by the firm AeroVironment for the secretive Defense Advanced Research Projects Agency, which can fly at 11 miles per hour and perch on a windowsill. But it is still a prototype. One of the smallest drones in use on the battlefield is the three-foot-long Raven, which troops in Afghanistan toss by hand like a model airplane to peer over the next hill.