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- Q3564580 subject Q20890307.
- Q3564580 abstract "The W56 is an American thermonuclear warhead produced starting in 1963 which saw service until 1993, on the Minuteman I and II ICBMs.The W56 was manufactured in a series of models, all of which were approximately the same size and had a 1.2 megaton yield. The Mod-1, Mod-2, and Mod-3 variants weighed 600 pounds, with the Mod-4 variant weighing 680 pounds. All versions were 17.4 inches (440 mm) diameter by 47.3 inches (1,200 mm) long.The W56 demonstrated a yield-to-weight ratio of 4.96kt per kg of device weight, and very close to the predicted 5.1kt/kg achievable in the highest yield to weight weapon ever built, the 25 megaton B41. However unlike the B41, which was never tested at full yield, the W56 demonstrated its efficiency in the XW-56X2 Bluestone shot of Operation Dominic in 1962, thus from information available in the public domain, the W56 may hold the distinction of demonstrating the highest efficiency in a nuclear weapon to date.The early models (Mod-1, Mod-2, and Mod-3) were produced starting in 1963 and retired in September 1966. The Mod-4 model was in production through 1969 and saw service until 1993. 1,000 total were produced, of which 455 were Mod-4.The early models had to be retrofitted to fix a reliability problem, likely leading to their early retirement.All retired W56 warheads were stored, to be finally dismantled by the end of June, 2006. One warhead, owing to its use of high performance but high sensitivity PBX nearly experienced a high-explosive detonation with no nuclear yield in 2005 because an unsafe amount of pressure was applied to the non-insensitive high explosive while it was being disassembled.".
- Q3564580 wikiPageExternalLink Allbombs.html.
- Q3564580 wikiPageExternalLink nuclearweaponarchive.org.
- Q3564580 wikiPageExternalLink UPI-29001166207259.
- Q3564580 wikiPageExternalLink AR2006062802006.html.
- Q3564580 wikiPageWikiLink Q1425035.
- Q3564580 wikiPageWikiLink Q177471.
- Q3564580 wikiPageWikiLink Q193227.
- Q3564580 wikiPageWikiLink Q2060548.
- Q3564580 wikiPageWikiLink Q20890307.
- Q3564580 wikiPageWikiLink Q3062170.
- Q3564580 wikiPageWikiLink Q3062538.
- Q3564580 wikiPageWikiLink Q3520719.
- Q3564580 wikiPageWikiLink Q6037346.
- Q3564580 wikiPageWikiLink Q625107.
- Q3564580 wikiPageWikiLink Q795289.
- Q3564580 wikiPageWikiLink Q861662.
- Q3564580 comment "The W56 is an American thermonuclear warhead produced starting in 1963 which saw service until 1993, on the Minuteman I and II ICBMs.The W56 was manufactured in a series of models, all of which were approximately the same size and had a 1.2 megaton yield. The Mod-1, Mod-2, and Mod-3 variants weighed 600 pounds, with the Mod-4 variant weighing 680 pounds.".
- Q3564580 label "W56".