Indeed, troops working with the Black Hornet say it runs silent and is invisible at more than 30 feet (10 meters). A Brigade Reconnaissance Force sergeant quoted in a U.K. Ministry of Defense announcement said the system is "very easy to operate and offers amazing capability to the guys on the ground."
A complete PD-100 kit comes with two Black Hornets, a docking station for battery recharging, a remote control unit and a mobile device with a 7-inch-wide (18 centimeters) screen to watch the camera feed -- all of which is carried in a tough, waterproof case, for a total weight of almost 3 lbs (1.3 kilograms).
Pulled out of the case and readied for action, the drone follows GPS waypoints to reach its target. Once there, it sends video and still images back to the operator. The Black Hornet can fly for 20 to 25 minutes before needing to recharge, so it's limited to traveling just three-quarters of a mile (1,200 m) in one shot.
Likewise, the Black Hornet is too small to carry a mid-wave infrared (MWIR) camera, so it's not able to do any night-spying. "The smallest MWIR sensor available on the market today is the FLIR Quark, weighing almost two times what our helicopter weighs," Aguirre said.