The Mark 4 nuclear bomb was an American nuclear bomb design produced starting in 1949 and in use until 1953. The Mark 4 was based on the earlier Mark 3 Fat Man design, used in the Trinity test and the bombing of Nagasaki. The Mark 3 was essentially handmade and constituted an emergency wartime expedient design; the Mark 4 utilized essentially the same basic principles (materials, dimensions of the nuclear core and explosive components) but reengineered the overarching system to be safer and easier to produce. The basic idea was to "GI-proof" otherwise sensitive nuclear weapons.

Property Value
dbo:Weapon/diameter
  • 1524.0
dbo:Weapon/length
  • 3251.2
dbo:abstract
  • The Mark 4 nuclear bomb was an American nuclear bomb design produced starting in 1949 and in use until 1953. The Mark 4 was based on the earlier Mark 3 Fat Man design, used in the Trinity test and the bombing of Nagasaki. The Mark 3 was essentially handmade and constituted an emergency wartime expedient design; the Mark 4 utilized essentially the same basic principles (materials, dimensions of the nuclear core and explosive components) but reengineered the overarching system to be safer and easier to produce. The basic idea was to "GI-proof" otherwise sensitive nuclear weapons. The Mark 4 was 60 inches (1.5 m) in diameter and 128 inches (3.3 m) long, the same basic dimensions as Mark 3. It weighed slightly more at 10,800 to 10,900 pounds (4,900 to 4,940 kg), depending on the specific Mark 4 version. (Mark 3 weighed 10,200 lb or 4,630 kg.) In addition to being easier to manufacture, the Mark 4 introduced the concept of in flight insertion (IFI), a weapons safety concept which was used for a number of years. An IFI bomb has either manual or mechanical assembly, which keeps the nuclear core stored outside the bomb until close to the point that it may be dropped. To arm the bomb, the fissile nuclear materials are inserted into the bomb core through a removable segment of the explosive lens assembly, which is then replaced and the weapon closed and armed. Mark 4 models used composite uranium and plutonium fissile pits. The exact pit assemblies were common with several other U.S. nuclear weapons, the Type C and Type D pit assemblies. Along with being composite cores, the device was the first weapon to rely upon levitated-pit implosion. These early weapons with a levitated pit had a removable pit, called an open pit. It was stored separately, in a special capsule called a birdcage.Various versions of the Mark 4 had explosive yields of 1, 3.5, 8, 14, 21, 22, and 31 kilotons (4 to 130 TJ). A total of 550 Mark 4 nuclear weapons were produced and was succeeded by the Mk6, which was generally similar, but much improved. (en)
  • La Mark 4 est une arme nucléaire américaine de type bombe A produite à partir de 1949 et en usage jusqu'en 1953. (fr)
  • Mark 4はアメリカ合衆国が開発した核爆弾。Mark 3・ファットマンを戦後に改良したものである。1949年に生産を開始し、550発が生産され、1953年まで配備された。弾頭部はW4核弾頭としてSM-62スナーク・ミサイルに使用される計画もあったが、こちらは実用化されず1951年に開発中止となった。 Mark 3・ファットマンはあくまでも、戦時に開発された兵器であり、生産性や安全性に問題を有していた。Mark 4は外形や弾頭など、主要設計はMark 3と同等であるものの、生産性や安全性について改良が施されたものとなっている。大きさは直径60インチ、長さ128インチとMark 3とほぼ同じであるが、重量は10,800から10,900ポンドとMark 3の10,200ポンドよりやや重くなっている。 安全装置はIn flight insertion(IFI)というものであり、航空機に搭載中は核物質の一部を取り外し、事故の際でも臨界に達しないようにしている。これは初期のアメリカの核爆弾に共通した装置であるが、Mark 4から取り入れられた。安全装置の解除は爆弾内部にアクセスし、核物質を所定の場所に取り付ける必要がある。Mark 4は核分裂反応によるものであり、核物質としてウラン・プルトニウムの混合物をピットに使用していた。ピットの形状は、アメリカの核兵器の規格でタイプCおよびタイプDのものであった。 幾つかのサブタイプが存在し、威力はそれぞれ1、3.5、8、14、21、22、31キロトンであった。B-29やB-36のほか、アメリカ海軍のAJサベージにも搭載された。 なお、Mark 4の成功を受けて、後継のMark 6が開発されている。 (ja)
  • Mark 4 foi uma linha de bombas de fissão dos Estados Unidos da América, como que na Segunda Guerra Mundial o Fat Man foi a bomba com maior poder, os projetos seguintes como este a W5 e a Mark 6, foram todos projetos semelhantes a o Fat Man, alguns variantes destes projetos eram tão parecidos com ele que foram considerados replicas quase perfeitas do Fat. Este projeto tinha o mesmo tamanho a componentes(urânio e plutônio) do material físsil de um Mark 3(Fat), mas aplicaram técnicas mais modernas para facilitar a produção em massa. O Mark 4 tinha 1,5 m de diâmetro e 128 polegadas (3,3 m) de comprimento, as mesmas dimensões de base do Mark 3. Ele pesava pouco mais de 4900 kg. Além de serem mais fáceis de fabricar, o Mark 4 introduziu o conceito de inserção no vôo ou IFI , um conceito de segurança de armas que foi usado para um número de anos. Uma bomba IFI tem manual ou mecânico de montagem, que mantém o núcleo nuclear armazenados fora da bomba até certo ponto antes de ser lançado no alvo. Para armar a bomba, os materiais nucleares físseis são inseridos no núcleo da bomba, que logo depois é selada e lançada. O Mark 4 teve as potências 1, 3,5, 8, 14, 21, 22 e 31 quilotoneladas. (pt)
  • Mk 4是美国基于MK Ⅲ Mod 0的基础上进行改进设计后的一种内爆法原子弹,也是世界上第一種量產型的核武器。 (zh)
dbo:diameter
  • 1.524000 (xsd:double)
dbo:length
  • 3.251200 (xsd:double)
dbo:thumbnail
dbo:type
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  • 4727115 (xsd:integer)
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  • 733704322 (xsd:integer)
dbp:alt
  • A large bomb resting on a cradle
dbp:caption
  • A Mark 4N aluminum bomb casing. Stockpile Mk 4's used a 2,830 lb. steel casing.
dbp:crew
  • 1 (xsd:integer)
dbp:detonation
  • focussed high explosive implosion
dbp:filling
  • Composite uranium and plutonium fissile pits
dbp:imageSize
  • 250 (xsd:integer)
dbp:isExplosive
  • y
dbp:number
  • 550 (xsd:integer)
dbp:origin
  • United States
dbp:service
  • 1949 (xsd:integer)
dbp:usedBy
dbp:yield
  • , depending on construction and/or pit
dct:subject
http://purl.org/linguistics/gold/hypernym
rdf:type
rdfs:comment
  • La Mark 4 est une arme nucléaire américaine de type bombe A produite à partir de 1949 et en usage jusqu'en 1953. (fr)
  • Mk 4是美国基于MK Ⅲ Mod 0的基础上进行改进设计后的一种内爆法原子弹,也是世界上第一種量產型的核武器。 (zh)
  • The Mark 4 nuclear bomb was an American nuclear bomb design produced starting in 1949 and in use until 1953. The Mark 4 was based on the earlier Mark 3 Fat Man design, used in the Trinity test and the bombing of Nagasaki. The Mark 3 was essentially handmade and constituted an emergency wartime expedient design; the Mark 4 utilized essentially the same basic principles (materials, dimensions of the nuclear core and explosive components) but reengineered the overarching system to be safer and easier to produce. The basic idea was to "GI-proof" otherwise sensitive nuclear weapons. (en)
  • Mark 4はアメリカ合衆国が開発した核爆弾。Mark 3・ファットマンを戦後に改良したものである。1949年に生産を開始し、550発が生産され、1953年まで配備された。弾頭部はW4核弾頭としてSM-62スナーク・ミサイルに使用される計画もあったが、こちらは実用化されず1951年に開発中止となった。 Mark 3・ファットマンはあくまでも、戦時に開発された兵器であり、生産性や安全性に問題を有していた。Mark 4は外形や弾頭など、主要設計はMark 3と同等であるものの、生産性や安全性について改良が施されたものとなっている。大きさは直径60インチ、長さ128インチとMark 3とほぼ同じであるが、重量は10,800から10,900ポンドとMark 3の10,200ポンドよりやや重くなっている。 幾つかのサブタイプが存在し、威力はそれぞれ1、3.5、8、14、21、22、31キロトンであった。B-29やB-36のほか、アメリカ海軍のAJサベージにも搭載された。 なお、Mark 4の成功を受けて、後継のMark 6が開発されている。 (ja)
  • Mark 4 foi uma linha de bombas de fissão dos Estados Unidos da América, como que na Segunda Guerra Mundial o Fat Man foi a bomba com maior poder, os projetos seguintes como este a W5 e a Mark 6, foram todos projetos semelhantes a o Fat Man, alguns variantes destes projetos eram tão parecidos com ele que foram considerados replicas quase perfeitas do Fat. O Mark 4 teve as potências 1, 3,5, 8, 14, 21, 22 e 31 quilotoneladas. (pt)
rdfs:label
  • Mark 4 nuclear bomb (en)
  • Mark 4 (bombe nucléaire) (fr)
  • Mark 4 (核爆弾) (ja)
  • Mark 4 (pt)
  • Mk 4原子彈 (zh)
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  • Mark 4 nuclear bomb (en)
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