Aerodynamics and avionics.The Bureau of Steam Engineering Bureau of Steam Engineering was set up by act of 5 July 1862, receiving some of the duties of the former Bureau of Construction, Equipment and Repair. It became, by the Naval Appropriation Act of 4 June 1920, the Bureau of Engineering. reported on 15 October 1918 that five Hart and Eustiss reversible pitch propellers were under construction for use on twin-engine dirigibles and two variable-pitch propeller hubs for the F-5L were being ordered. Above left, a Smith controllable pitch propeller A controllable pitch propeller (CPP) or variable pitch propeller is a special type of propeller with blades that can be rotated around their long axis to change their pitch. , circa 1932, is an example of one of many designs tested. On 2 May 1986 the Navy initiated a contract for the V22 joint-services tilt-rotor aircraft, above right. The X-31 Vector enhanced fighter maneuverability aircraft, right, flew at Mach 1.2 on 17 March 1994 using thrust vectoring vanes instead of its tail surfaces for control, marking a significant aeronautical "first." The X-31 was developed jointly by the Navy, the Defense Advanced Research Projects Agency Defense Advanced Research Projects Agency (DARPA), U.S. government agency administered by the Department of Defense (see Defense, United States Department of). and the German Ministry of Defense. The Silver Fox, bottom, a Navy unmanned aerial vehicle A powered, aerial vehicle that does not carry a human operator, uses aerodynamic forces to provide vehicle lift, can fly autonomously or be piloted remotely, can be expendable or recoverable, and can carry a lethal or nonlethal payload. (UAV UAV Unmanned Aerial Vehicle UAV Unmanned Air Vehicle UAV Unmanned Aerospace Vehicle UAV Unmanned Airborne Vehicle UAV Uninhabited Air Vehicle UAV Urban Assault Vehicle UAV Unpiloted Aerial Vehicle (less common) ), made its first operational appearance in Operation Iraqi Freedom. Operators use a laptop computer and a variety of cameras to control the aircraft. The roots of UAV technology can be traced to a 15 September 1924 flight of an N-9 equipped with radio control and without a human pilot aboard. The 40-minute flight at the Naval Proving Grounds, Dahlgren, Va. demonstrated the practicability of radio control of aircraft. |
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