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Vickers Valiant
The Vickers-Armstrongs Valiant was a British four-jet bomber, once part of the Royal Air Force's V bomber nuclear force in the 1950s and 1960s. The Valiant was the first of the V bombers to become operational, and was followed by the Handley Page Victor and the Avro Vulcan; however it was noticeably less advanced than its counterparts. Several Valiants were soon converted to perform various support roles, such as aerial refuelling tankers and reconnaissance aircraft.
The Valiant was intended for operations as a high-level strategic bomber. By late 1964 it was found that all variants of the Valiant showed premature fatiguing and inter-crystalline corrosion in wing spar attachment castings traced to the use of a poorly understood〔“Pitfalls of the substitution of sophistication for Common Sense” D Howe, Cranfield University. IMechE Vol 212 Part G, Sec 5.1 Metals, p. 307. May 1998〕 aluminium alloy, DTD683. Rather than proceeding with an expensive rebuilding program, the Valiant was formally retired in 1965. Its duties were continued by the other V-bombers which remained in service until the 1980s.
==Development==
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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