Sweden
12 cm/50 (4.7") Model 1934/1936
Updated 03 January 2009
Exported to Poland, this gun used a horizontal sliding breech block and was of loose barrel construction.  Breech was manually worked.
WNSweden_47-50_m1934_twin_pic.jpg

Twin 12 cm/50 Model 1934/1936 from Polish Minelayer Gryf now at the Exposition of Navy Museum, Gdynia
Photograph copyrighted by Michal Kopacz
WNSweden_47-50_m1934_single_pic.jpg

Single 12 cm/50 Model 1934/1936 from Polish Minelayer Gryf now at the Polish Army Museum, Warsaw
Photograph copyrighted by Michal Kopacz
.
Gun Characteristics
.
Designation 12 cm/50 (4.7") Model 1934/1936
Ship Class Used On Polish Destroyers Blyskawica and Grom
Polish 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 kg)
Projectile Types and Weights HE - 52.9 lbs. (24 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
.
Elevation With 52.9 lbs. (24 kg) HE Shell
Range @ 30 degrees 21,300 yards (19,500 m)
.
Mount / Turret Data
.
Designation Twin Mounts
   Blyskawica (3) and Gryf (2)

Single Mount
   Blyskawica (1) and Gryf (2)
Weight
(see Note)		 Twin Mount - 20.2 tons (20.5 mt)
Singe 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)
Note:  Mount weight included guns and shield.  Shield was 0.28 in (7 mm) thick and weighed 2.8 tons (2.85 mt).
.
Data from
"Naval Weapons of World War Two" by John Campbell
"Destroyers of World War Two" by M.J. Whitley
Page History

15 May 2006 - Benchmark
03 January 2009 - Corrected caption of twin mounting picture and number of guns on Gryf