Schwerer Gustav (English: Heavy Gustaf or Great Gustaf) was the name of a German 80 cm K (E) railway gun. It was developed in the late 1930s by Krupp as siege artillery for the explicit purpose of destroying the main forts of the French Maginot Line, the strongest fortifications then in existence. The fully assembled gun weighed nearly 1,350 tonnes, and could fire shells weighing seven tonnes to a range of 47 kilometres (29 mi). The gun was designed in preparation for the Battle of France, but was not ready for action when the battle began, and in any case the Wehrmacht's Blitzkrieg offensive through Belgium rapidly outflanked and isolated the Maginot Line's World War I-era static defenses, forcing them to surrender uneventfully and making their destruction unnecessary. Gustav was later employed in the Soviet Union at the siege of Sevastopol during Operation Barbarossa, where among other things, it destroyed a munitions depot buried in the bedrock under a bay. The gun was moved to Leningrad, and may have been intended to be used in the Warsaw Uprising like other German heavy siege pieces, but the rebellion was crushed before it could be prepared to fire. Gustav was destroyed near the end of the war in 1945 to avoid capture by the Red Army.



It was the largest-calibre rifled weapon ever used in combat, the heaviest mobile artillery piece ever built in terms of overall weight, and fired the heaviest shells of any artillery piece. It is only surpassed in calibre by the British Mallet's Mortar and the American Little David mortar (both 36 inch; 914 mm). 

Weight	1,350 tonnes (1,490 short tons; 1,330 long tons)
Length	47.3 metres (155 ft 2 in)
Barrel length	32.5 metres (106 ft 8 in) L/40.6
Width	7.1 metres (23 ft 4 in)
Height	11.6 metres (38 ft 1 in)
Crew	250 to assemble the gun in 3 days (54 hours), 2,500 to lay track and dig embankments. 2 Flak battalions to protect the gun from air attack.
Caliber	80 centimetres (31 in)
Elevation	Max of 48°
Rate of fire	1 round every 30 to 45 minutes or typically 14 rounds a day
Muzzle velocity	820 m/s (2,700 ft/s) (HE) 720 m/s (2,400 ft/s) (AP)
Effective firing range	about 39,000 metres (43,000 yd)
Maximum firing range	47,000 metres (51,000 yd) (HE) 38,000 metres (42,000 yd) (AP)

 


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