Heavy Anti-Aircraft
105 mm-SK-C/33
View from above	View left side	View from fore	View from aft

105 mm-SK-C/33 (Heavy Anti-Aircraft)
Gun Characteristics
Designation	105 mm/L65 (4,1") caliber SK C/33
Date of design	1933
Date in service	1935
No. of weapons installed	8 on Bismarck 4 on Tirpitz (until August 1941)
Locations	Four forward double mounts (Dop. L. C/31) on Bismarck Two aft double mounts (Dop. L. C/31) on Tirpitz (until August 1941)
Gun weight	4.560 kg (10.053 lbs)
Gun length oa	6,84 m (269 in)
Length of bore	6,348 m (249,9 in)
Number of grooves	36
Length of rifling	5,531 m (217,8 in)
Chamber volume	7,31 dm³ (446 in³)
Rate of fire	15 rounds per gun per minute
Ammunition
Type	Cartridge - Fixed
Weight of complete round	27,35 kg (60,3 lbs)
Projectile types and weights	AP - 15,8 kg (34,8lbs) HE - 15,1 kg (33,3 lbs) HE - Incendiary - 15,8 kg (34,8 lbs) Illum - 14,7 kg (32,4 lbs)
Bursting charge	NA
Projectile length	N/A - complete round 116,4 cm (45,83 in)
Propellant charge	6,05 kg (13,34 lbs.)
Muzzle velocity	AP - N/A HE - 900 meter per second (2.952 feets per second) Illum - 650 meter per second (2.133 feets per second)
Working pressure	2.850 kg/cm² (18 tons/in²)
Approximate barrel life	2.950 rounds
Ammunition Inventory	6.720 rounds in total 400 rounds per gun (designed)
Range
Elevation with 15,1 kg (33,3 lbs) HE Shell
Range at 45°	17.700 m (19.357 yards)
AA ceiling at 80°	12.500 m (41.010 feet)
Mount/Turret Data
Weight	27.805 kg (61.300 lbs)
Elevation	-8°/+80°
Elevation rate	10° per second
Train	360°
Train rate	8.0° per second
Cross leveling	-17°/+17°
Cross leveling rate	5° per second
Note:	The Dop. L. C/31 was originally developed for the 88 mm AA gun used on earlier ships. This mounting was later adapted for use with the 105 mm guns.

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