| abstract | - The Boeing A160 Hummingbird (military designation: YMQ-18A) is an unmanned aerial vehicle (UAV) helicopter. Its design incorporates many new technologies never before used in helicopters, allowing for greater endurance and altitude than any helicopter currently in operation. The development of Hummingbird was begun by Frontier Aircraft. In May 2004, the company was acquired by Boeing and integrated into Boeing Phantom Works and then into the Advanced Systems group of Boeing Integrated Defense Systems. Early A160s were powered by modified Subaru automotive engines, but newer versions use Pratt & Whitney PW207D turboshaft engines. The A160 continued with developmental flight tests in 2010, but test flights have already demonstrated greater endurance, higher altitudes, more extensive autonomy, and greater payload. The program has ambitious goals of a range, 24-hour endurance, and altitude. Flights are largely autonomous, with the aircraft making its own decisions about how to fly itself so as to meet certain objectives, rather than relying on real-time human control. Maximum speeds are over 140 knots. The aircraft is from nose to tail and has a rotor diameter of .
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