Description

Exported to Poland, this gun used a horizontal sliding breech block and was of loose barrel construction. Breech was manually worked.

Gun Characteristics

Designation 12 cm/50 (4.7") Model 1934/1936
Ship Class Used On Destroyers: Blyskawica and Grom
Minelayer: Gryf
Date Of Design 1934
Date In Service 1936
Gun Weight 4.05 tons (4.115 mt) including BM
Gun Length 251.6 in (7.390 m)
Bore Length about 236.2 in (6.000 m)
Rifling Length N/A
Grooves 36
Lands N/A
Twist Increasing RH twist
Chamber Volume 885 in3 (14.5 dm3)
Rate Of Fire about 10 rounds per minute

Ammunition

Type Fixed
Weight of Complete Round HE: 90.4 lbs. (41.0 kg)
Projectile Types and Weights HE: 52.9 lbs. (24.0 kg)
Bursting Charge N/A
Projectile Length N/A
Complete Round: 58 in (14.7 cm)
Propellant Charge 20.7 lbs (9.4 kg) Swedish 868 cal (WL)
Muzzle Velocity 2,953 fps (900 mps)
Working Pressure 20.95 tons/in2 (3,300 kg/cm2)
Approximate Barrel Life N/A
Ammunition stowage per gun N/A

Range

Range with 52.9 lbs. (24.0 kg) HE
Elevation Distance
30 degrees 21,300 yards (19,500 m)

Mount/Turret Data

Designation Twin Mount
    Blyskawica (3), Grom (3) and Gryf (2): N/A

Single Mount
    Blyskawica (1), Grom (1) and Gryf (2): N/A

Weight 1 Twin Mount: 20.2 tons (20.5 mt)
Single Mount: N/A
Elevation -3 / +30 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil 21.7 in (55 cm)
  • ^Mount weight included guns and shield. Shield was 0.28 in (7 mm) thick and weighed 2.8 tons (2.85 mt).

Other Resources

Article on the 12 cm/50 M1934/1936 in Polish service at Army 1914-1945.

    Polish: 120 mm L/50 wz. 36 Bofors

    English via Microsoft Translator: Bofors 120 mm L/50 Model 1936

Sources

"Naval Weapons of World War Two" by John Campbell
"Destroyers of World War Two" by M.J. Whitley
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Special help from Maciej Tomaszewski of Army 1914-1945

Page History

15 May 2006 - Benchmark
03 January 2009 - Corrected caption of twin mounting picture and number of guns on Gryf
13 August 2018 - Updated to HTML 5 format, added guns on Grom
28 August 2018 - Added links to Army 1914-1945