Used on Panzerschiffes when commissioned, but replaced with 10.5 cm (4.1") SK C/33 before the start of World War II. This weapon had a very high muzzle velocity and thus a short barrel life.
A loose-barrel type with a vertical sliding semi-automatic breech-block that fired fixed ammunition.
|Designation||8.8 cm/78 (3.46") SK C/31|
|Ship Class Used On||Lützow (ex-Deutschland) Class|
|Date Of Design||1931|
|Date In Service||1933|
|Gun Weight||9,380 lbs. (4,255 kg)|
|Gun Length oa||270.5 in. (6.870 m)|
|Bore Length||249.6 in (6.341 m)|
|Rifling Length||213.4 in. (5.422 m)|
|Number Of Grooves||(28) 0.047 in deep x 0.235 in (1.2 mm x 5.97 mm)|
|Lands||0.154 in (3.9 mm)|
|Twist||Increasing RH 1 in 55 to 1 in 35|
|Chamber Volume||391 in3 (6.4 dm3)|
|Rate Of Fire||15 - 20 rounds per minute|
|Weight of Complete Round||HE: 40.8 lbs. (18.5 kg)
|Projectile Types and Weights||HE: 19.8 lbs. (9.0 kg)
ILLUM: 20.7 lbs. (9.4 kg)
Complete Round 48.3 in (1.228 m)
|Propellant Charge||9.99 lbs. (4.53 kg) RPC/32 (5.5/2)|
|Muzzle Velocity||HE: 3,117 fps (950 mps)
ILLUM: 2,133 fps (650 mps)
|Working Pressure||19.7 tons/in2 (3,100 kg/cm2)|
|Approximate Barrel Life||about 1,500 rounds|
|Ammunition stowage per gun||500 rounds 1|
- ^Outfit for Panzerschiffes was nose-fuzed HE with and without tracer and illumination rounds.
|Weight||60,185 lbs. (27,300 kg)|
|Elevation||-10 / +80 degrees|
|Elevation Rate||10 degrees per second|
|Train Rate||10 degrees per second|
his mounting was triaxially stabilized which could compensate for pitch and yaw up to 17 degrees in each direction.