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JB-4
The JB-4, also known as MX-607, was an early American air-to-surface missile developed by the United States Army Air Forces during World War II. Using television/radio-command guidance, the JB-4 reached the flight-testing stage before being cancelled at the end of the war.
==Design and development==
Developed under the project code MX-607 at Wright Field in Ohio,〔〔Ross 1951, p.115.〕 the JB-4 was a modification of the GB-4 glide bomb,〔Parsch 2005.〕〔 which had entered service with the U.S. Army Air Forces in 1944.〔Parsch 2003.〕 Powered by a Ford PJ31 pulsejet engine, the JB-4 was intended to give an improved standoff range as opposed to its unpowered predecessor.〔 In addition, the addition of an engine made the missile capable of being ground-launched as well.〔 However the requirement to carry fuel for the engine meant that the size of the JB-4's warhead was limited to ,〔 compared to the bomb that formed the core of the GB-4.〔Hanle 2007, p.114.〕
Utilising primarily plywood construction,〔Hanle 2007, p.268.〕 the JB-4 utilised television/radio-command guidance, with an AN/AXT-2 transmitter broadcasting a television signal from a camera in the missile's nose to a remote operator. The operator, viewing the transmitted picture, would then transmit commands to the missile via radio, correcting the missile's course to ensure striking the target.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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