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NSRDC BQM-108
The XBQM-108A was an experimental VTOL unmanned aerial vehicle developed by the United States Navy during the 1970s. Although the XBQM-108A successfully conducted tethered flight tests, the project was cancelled before any free flights could be conducted.
==Design and development==
The XBQM-108 project was initiated in 1975 by the Aviation and Surface Effects Department of the U.S. Navy's David W. Taylor Naval Ship Research and Development Center.〔〔Eilertson 1977〕 The project was intended to demonstrate the practicality of the 'Vertical Attitude Take-Off and Landing' (VATOL), or 'tailsitter' flight profile for remotely piloted vehicles,〔 as the Navy believed the increasing threat posed by cruise missiles required that aviation assets be dispersed among additional ships of the fleet, which would possess limited space for aviation operations as opposed to conventional aircraft carriers.〔
Based on the MQM-74 Chukar target drone, the XBQM-108A was modified with a revised, delta wing with canard control surfaces.〔 The XBQM-108A was fitted with a thrust vectoring system based on the use of vanes that deflected the engine's exhaust; the aircraft retained the Chukar's recovery parachute and radio guidance system,〔Parsch 2002〕 with the addition of a radar altimeter and midcourse guidance unit based on that of the AGM-84 Harpoon anti-ship missile.〔''Naval Engineers' Journal'', Volume 89, (pp.164-169 ). (1977)〕
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