One of the largest guns ever constructed, this was probably an experimental weapon. Ordered in 1938, the prototype gun and cradle were apparently fired a few times although the proof mounting was not completed. It seems unlikely that this weapon was ever intended to be used as an actual naval gun as even the gigantic H-44 battleship was to be armed with "only" 50.8 cm (20") guns.
Construction was of built up design consisting of four layers; a shrunk liner, A tube and two outer tube layers. Used a horizontal sliding breech block, similar to other Krupp designs.
Actual bore diameter was 53.34 cm (21.0").
This projectile is modeled in Nathan Okun's Facehard programs.
|Designation||53 cm/52 (21") Gerät 36|
|Ship Class Used On||Experimental|
|Date Of Design||1938|
|Date In Service||1941 (?)|
|Gun Weight||Including breech mechanism: 329.8 tons (335.1 mt)|
|Gun Length oa||1,090.55 in. (27.700 m)|
|Bore Length||1,025.2 in. (26.040 m)|
|Rifling Length||843.2 in. (21.417 m)|
|Number Of Grooves||(110) 0.236 in deep x 0.323 in (6.0 mm x 8.2 mm)|
|Lands||0.277 in (7.03 mm)|
|Twist||Increasing RH 1 in 35.9 to 1 in 29.9|
|Chamber Volume||76,280 in3 (1,250 dm3)|
|Rate Of Fire||Probably less than 1 round per minute|
|Type||Cartridge - Bag - Bag|
|Projectile Types and Weights||APC L/4,9: 4,850 lbs. (2,200 kg)
HE L/4,9 nose fuze: 4,850 lbs. (2,200 kg)
|Bursting Charge||APC L/4,9: 100.2 lbs. (45.45 kg)
HE L/4,69 nose fuze: 485 lbs. (220 kg)
|Projectile Length||APC L/4,9: 103.2 in (262.1 cm)
HE L/4,9 nose fuze: 103.8 in (264.6 cm)
|Propellant Charge 1||Fore: 551 lbs. (250 kg) Gu RP 2
Middle: 551 lbs. (250 kg) Gu RP
Main: 661 lbs. (300 kg) Gu RP
Brass case for main charge: 346 lbs. (157 kg)
|Muzzle Velocity||2,690 fps (820 mps)|
|Working Pressure||19.0 tons/in2 (3,000 kg/cm2)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||N/A|