A Butterfly Bomb, or (Spreng Dickwändig 2 kg or SD2) was a German 2 kilogram anti-personnel bomb dropped by the German Luftwaffe during the Second World War. It was named because the thin cylindrical metal outer shell hinged open when it was dropped and gave a superficial appearance of a large butterfly. Massive ordinance air-burst bomb. ... The   Luftwaffe? (German: air force, IPA: [luftvafÉ™]) is the commonly used term for the German air force. ... Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ... Families Superfamily Hesperioidea: Hesperiidae Superfamily Papilionoidea: Papilionidae Pieridae Nymphalidae Lycaenidae Riodinidae A butterfly is a flying insect of the order Lepidoptera belonging to one of the superfamilies Hesperioidea (the skippers) and Papilionoidea (all other butterflies). ...

Before the vanes deployed, the bomb was a cylinder 80 millimetres long and slightly smaller in diameter. A steel cable 150 millimetres long was attached to the fuze screwed into the fuze pocket in the side of the bomb. When it was dropped, the outer shell would hinge open as two half-cylinders and spring-loaded vanes at the ends of them would also flip out. As the bomb fell these rotated the spindle, arming the fuze. The word cylinder has several meanings. ... // Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... It has been suggested that fuze for ammunition be merged into this article or section. ...

The bomb could be fitted with one of three fuses - the 41 fuse which detonated on impact, the 67 fuse which had a settable time delay of between 5 and 30 minutes, and the 70 fuse which detonated if the bomb was moved. It contained 225 grams of TNT. It was generally lethal to anyone standing unprotected within about 25 metres of it, and could injure people as far away as 150 metres. Defusing ones which had failed to detonate or equipped with the anti-handling fuse, was not practical and they were usually destroyed where they fell. Trinitrotoluene (TNT, or Trotyl) is a pale yellow crystalline aromatic hydrocarbon compound that melts at 354 K (178 Â°F, 81 °C). ...

They were packed into canisters containing between 6 and 108 of the bombs, depending upon the canister type, and were released as the canister fell. These bombs were first used in June 1942 against Grimsby and Cleethorpes in Great Britain, and subsequently used in the Middle East. The British kept secret all the damage and disruption caused by these bombs so as not to encourage Germany to use them elsewhere. The United States manufactured a copy of the bomb for use during the Korean War and Vietnam War, designating it the M83 bomb. Location within the British Isles. ... Cleethorpes, UK, Beach and Pier Cleethorpes is a town in North East Lincolnshire, England, situated at the mouth of the river Humber. ... A map showing countries commonly considered to be part of the Middle East The Middle East is a region comprising the lands around the southern and eastern parts of the Mediterranean Sea, a territory that extends from the eastern Mediterranean Sea to the Persian Gulf. ... The Korean War (Korean: 한국전쟁/韓國戰爭), from June 25, 1950 to July 27, 1953, was a conflict between North Korea and South Korea. ... The Vietnam War or Second Indochina War was a 1957 to 1975 conflict primarily between the Communist Democratic Republic of Vietnam (DRVN) and anti-communist Republic of Vietnam (RVN) that directly involved an array of pro-North and pro-South forces, most notably the CommunistNational Liberation Front (NLF, or Viet... Massive ordinance air-burst bomb. ...

See also Thermos Bomb A Thermos Bomb, or (AR-4) was an anti-personnel bomb dropped by the Italian Air Force during the Second World War. ...