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Butterfly Bomb

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news of the damage and disruption caused by butterfly bombs in order to avoid encouraging continued use by the Germans. On October 28, 1940, some butterfly bombs that had failed to arm themselves properly were discovered in Ipswich by British Army ordnance technicians Sergeant Cann and 2nd Lieutenant Taylor. By screwing the arming rods back into the fuzes (i.e. the unarmed position) they were able to recover safe examples of the new weapon system to allow the British to reverse-engineer and understand the mechanism.
125:(connected to the fuze) counterclockwise as the bomblet fell. After the spindle had revolved approximately 10 times (partially unscrewing itself from the bomb) it released a spring-loaded pin inside the fuze, which fully armed the SD 2 bomb. The wings and arming spindle remained attached to the bomb after the fuze had armed itself, as the bomb descended towards the ground. Butterfly bombs contained the kleine ZĂĽndladung 34 (kl. Zdlg. 34/Np with a blasting cap and 7 grams of 348: 360: 336: 324: 309: 133:) explosive. The fragmentation density produced by an SD 2 was 1 fragment per m in 8 meters radius from a ground burst SD 2 bomb; overall, the body of an SD 2 did produce about 250 fragments with a mass of over 1 gram and a still greater number of lighter fragments. The fragments were generally lethal to anyone within a radius of 10 metres (33 ft) and could inflict serious 91:. It was so named because the thin cylindrical metal outer shell which hinged open when the bomblet deployed gave it the superficial appearance of a large butterfly. The design was very distinctive and easy to recognise. SD 2 bomblets were not dropped individually, but were packed into containers holding between 6 and 108 submunitions e.g. the 198:
Not all unexploded SD 2 butterfly bombs still have their wings attached. In some cases the wings have rusted away and fallen off. The SD 2 then resembles a rusty tin can with an aluminium disc (the fuze) in its side, sometimes with a short stub projecting from it. Regardless of age and condition, all
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in June 1943, amongst various other targets in the United Kingdom. Lieutenant Colonel Eric Wakeling led the clearance of the unexploded ordnance in Grimsby within the Royal Engineers. They were subsequently used against Allied forces in the Middle East. The British Government deliberately suppressed
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submunition dispensers. The SD 2 submunitions were released after the container was released from the aircraft and had burst open. Because SD 2s were always dropped in groups (never individually) the discovery of one unexploded SD 2 was a reliable indication that others had been dropped nearby. This
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On the island of Malta in 1981 Paul Gauci, a 41-year-old Maltese man, died after welding a butterfly bomb to a metal pipe and using it as a mallet, thinking it was a harmless can. The latest find of such a bomb was on 28 October 2009, by an 11-year-old boy in a secluded valley close to a heavily
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Butterfly bombs in a submunitions container could have a mixture of different fuzes fitted to increase disruption to the target. Additionally, when a single fuze type with two operating functions was fitted (e.g. type 41), bombs in a submunitions container could have either or both possible fuze
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the bomb in the air, approximately 5 seconds after being armed. The "AZ" (AufschlagzĂĽnder - impact) setting triggers detonation when the bomb hits the ground. The fuze is armed if 4 screw threads at the base of the arming spindle are visible. This fuze is highly sensitive to disturbance if the
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screwed into the fuze pocket in the side of the bomblet. The outer shell was hinged and would flip open as two half-cylinders when it was dropped. Additionally, spring-loaded wings at the ends would flip out. The wings at the end were canted at an angle to the airflow, which turned the spindle
266:. Because of Hitler's interference, these jet-powered fighters were pressed into service as a Jabo (JagdBomber, fighter-bomber), a role for which they were poorly suited. Notably, Me 262s were sent on nuisance raids against Eindhoven in early October, loaded with AB 250 bomblet dispensers. 235:(10 kg submunitions) on key Soviet airfields, a flight of three aircraft being assigned to each field. The purpose of these early attacks was to cause disruption and confusion as well as to preclude dispersion of Soviet planes until the main attack was launched. It was reported that 50: 38: 178:
settings selected by the Luftwaffe ground crew. Fuze variants such as the 41A, 41B, 70B1, 70B2, etc., also existed. These variants were inserted into the fuze pocket via a bayonet fitting (the fuze was held in place via two steel clips) but otherwise functioned identically.
159:– clockwork time delay. Time of detonation can be set between 5 and 30 minutes after arming itself in the air. This fuze also has an external selector switch for impact detonation. The particular switch setting of any type 67 fuze is clearly visible on its exterior. 378:
The United States manufactured a copy of the SD 2 for use during World War II, the Korean War and Vietnam War, designating it the M83 submunition. The 3 fuze types used on the M83 submunition were slightly modified versions of the original German designs:
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Luftwaffe monthly consumption of the SD 2 increased from 289,000 examples in the summer of 1941 to 436,000 in July 1943 and 520,000 in August 1943. This increase was nowhere near high enough to match the Luftwaffe senior leadership's demands.
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for any unexploded SD 2 butterfly bomb was to evacuate the area for at least 30 minutes (in case the bomblet was fitted with a type 67 time delay fuze), then surround it with a ring of sandbags (to contain the explosion) and destroy it
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injuries (e.g. deep penetrating eye wounds) as far away as 100 metres (330 ft). Butterfly bombs were usually painted either straw yellow (desert camouflage), or, if fitted with the DoppZ (41) or (41) A fuze, dark green or grey.
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by detonating a small explosive charge beside it. Other solutions were to attach a long string to the bomb and tug on it after taking cover, or for bombs in open countryside, shooting at them with a rifle from a safe distance.
386:- airburst or impact fuze. Airburst detonation occurred 2.5 seconds after arming. Detonation on impact was instantaneous. The fuze setting is clearly marked on the exterior and was selectable by ground crew 296: 269:
The last recorded UK death from a German butterfly bomb in England occurred on November 27, 1956, over 11 years after the end of the war: Flight Lieutenant Herbert Derrington of the
392:- clockwork time fuze with time delays ranging from 10, 20, 30, 40, 50 or 60 minutes. Has no markings, but is recognisable by the square-shaped fitting for the arming spindle 398:- anti-disturbance fuze. Detonation triggered when the device was disturbed. Has no markings, but is recognisable by the pentagonal-shaped fitting for the arming spindle 104:
ever used in combat and it proved to be a highly effective weapon. The bomb containers that carried the SD 2 bomblets and released them in the air were nicknamed the "
185:. This was because SD 2 fuzes were deliberately designed to be extremely difficult and dangerous to render safe once they had armed themselves. Instead, the standard 412: 173:) will trigger detonation if the bomb is moved after impact with the ground. The fuze is armed if 3 screw threads at the base of the arming spindle are visible. 623: 436: 794: 120:, which was slightly larger in diameter before its wings deployed. A steel cable 121 mm (4.8 in) long was attached via a spindle to an aluminium 1522: 926: 569: 153:
selector switch is set to "Zeit" and the bomb is unexploded. The particular switch setting of any type 41 fuze is clearly visible on its exterior.
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Butterfly bombs could be fitted with any one of three fuzes, which were made of aluminium and stamped with the model type surrounded by a circle:
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As with more modern cluster bombs, it was not considered practical to disarm butterfly bombs which had fully armed themselves but failed to
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Photo of an SD 2 from Civil Defence Training Pamphlet No 2: Objects Dropped From The Air (3rd Edition).
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lost 15 aircraft due to accidents with the SD 2s - nearly half of the total Luftwaffe losses that day.
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F/G series, but in practice, they could be lifted by a wide variety of aircraft, including the
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was examining an SD 2 at the "Upminster bomb cemetery" (some remote sandpits situated East of
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bomblet dispenser could carry 144 SD 2 anti-personnel submunitions, or 30 of the anti-armor
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Forsyth, Robert (2012). Me 262 Bomber and Reconnaissance Units. Osprey Publishing. pp 31.
148:– has an external selector switch with two settings. The "Zeit" (time) setting will 8: 285:
bombarded airfield. This bomb was safely detonated on-site by the Armed Forces of Malta.
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BBC Interview: German Cluster Bombing of Civilians During WW2. James I. Rogers June 2013
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unexploded SD 2s remain highly sensitive to disturbance and can easily detonate.
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The 4-pound (1.8 kg) M83 fragmentation bomblet was used in the US M28 and
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US M83 cluster bomb with wings closed. The fuze has not yet armed itself
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The SD 2 submunition was a 76-millimetre (3.0 in) long cylinder of
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Jappy, M.J. Danger UXB (London: MacMillan Publishers), 2001, page 158
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could carry 108 SD 2s. AB 250s were most frequently carried by the
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500 lb M29 cluster bomb with ninety M83 submunitions inside it
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The Butterfly Bombing of Grimsby, Untold History on History Hit TV
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at the base of arming spindle are visible: fuze is now armed
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British Government public warning about the Butterfly Bomb
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Price, Dr Alfred (Autumn 2003). "Pre-Emptive Strike".
624:"A Lesson of History: The Luftwaffe and Barbarossa" 1499: 870:Description of the M83, a US copy of this design 622:Ratley III, Major Lonnie O. (March–April 1983). 752:"Selected Incidents.......2|The Butterfly Bomb" 920: 775: 773: 781:"Boy Finds Lethal WWII Bomb in Qormi Valley" 513:, Key Publishing, No. 359, June 2001, p. 70 509:"Operation Barbarossa", Jonathan Garraway, 1523:Military equipment introduced in the 1940s 927: 913: 770: 621: 593: 227:The SD 2 saw use in the opening stages of 824: 670: 53:SD 2 - Open: wings have flipped open and 430:US M83 cluster bomb with wings deployed. 207:Butterfly bombs were first used against 48: 36: 723: 1500: 594:Williamson, Mitch (October 20, 2018). 476: 908: 843: 651: 1513:World War II aerial bombs of Germany 108:" by Luftwaffe air and ground crew. 13: 875:Additional photo of butterfly bomb 827:German Air-Dropped Weapons to 1945 783:. Times of Malta. 29 October 2009. 211:in 1940, but were also dropped on 14: 1534: 863: 435: 423: 411: 358: 346: 334: 322: 307: 295: 68:Sprengbombe Dickwandig 2 kg 818: 804:via uxoinfo.com. Archived from 787: 744: 717: 693: 676: 477:Rogers, James I. (2013-06-21). 353:AB 250-1 submunition dispenser. 100:bomb type was one of the first 727:Bomb Disposal in World War Two 645: 615: 606: 587: 562: 541: 516: 503: 470: 341:AB 70-3 submunition dispenser. 111: 1: 935:German aerial weapons of the 724:Ransted, Chris (2018-01-30). 459: 329:AB 24T submunition dispenser. 30:. For the culinary dish, see 464: 7: 447: 10: 1539: 373: 288: 25: 18: 1417: 1349: 1296: 1213: 1115: 1078: 1050: 1024: 976: 943: 254:submunitions. While the 848:. MacMillan Publishers. 524:"Butterfly Bombs terror" 19:Not to be confused with 1435:Blohm & Voss BV 950 1430:Blohm & Voss BV 246 1425:Blohm & Voss BV 143 1508:Anti-personnel weapons 825:Fleischer, W. (2004). 368:submunition dispenser. 317:submunition dispenser. 202: 58: 46: 1025:Anti-tank autocannons 628:Air University Review 187:render safe procedure 52: 40: 1418:Experimental weapons 1351:High-explosive bombs 1215:Armor-piercing bombs 1117:Anti-personnel bombs 844:Jappy, M.J. (2001). 795:"NAVORD OCL AV14-44" 596:"SD 2 Schmetterling" 229:Operation Barbarossa 167:anti-handling device 600:Weapons and Warfare 891:"Butterfly Bomb", 802:United States Navy 701:"AFM Results Page" 279:Oldchurch Hospital 237:Kampfgeschwader 51 213:Kingston upon Hull 59: 47: 1495: 1494: 1070:Werfer-Granate 21 737:978-1-5267-1567-8 730:. Pen and Sword. 574:Grimsby Telegraph 528:Grimsby Telegraph 404:M29 cluster bombs 260:Focke-Wulf Fw 190 1530: 1488: 1052:Unguided rockets 937:Second World War 929: 922: 915: 906: 905: 882: 859: 840: 813: 812: 810: 799: 791: 785: 784: 777: 768: 767: 765: 763: 758:on March 4, 2012 754:. 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Index

Butterfly Mine
Devil's Egg
deviled egg

fuze

screw threads
submunition
Luftwaffe
Second World War
AB 23
AB 250-3
cluster bombs
cast iron
fuze
Nitropenta
Amatol
fragmentation
detonate
anti-handling device
booby trap
detonate
render safe procedure
Ipswich
Kingston upon Hull
Grimsby
Cleethorpes
Operation Barbarossa
SD10s
Kampfgeschwader 51

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