Russia
4"/60 (10.2 cm) Pattern 1911
102 mm/60 (4") Pattern 1911
Updated 12 August 2012
One of the famous Obukhovski guns.  The gun was tested and accepted into service in 1911.  An initial order of 505 guns was placed with OSZ and by the end of 1916 some 225 had been delivered.  A further 200 were scheduled to be built in 1917 and an additional 80 in 1918, but it is unknown how many of these guns were actually delivered.  In 1921 another 85 guns were ordered from the Perm' factory, but later that order was reduced to 48.

In 1941 there were a total of 146 guns in service.  Of these, 49 were in the Baltic Fleet, 30 in the Black Sea Fleet, 30 in the Pacific Fleet, 18 in the Northern Fleet, 9 in the Caspian Flotilla and 6 in the Pinsk Flotilla.

Constructed of A tube which was fastened throughout its length with three cylinders attached while the gun was still hot.  Fired fixed ammunition and used a semi-automatic sliding breech block.

Actual bore diameter was 101.6 mm (4.0").
WNRussian_4-60_m1911_pic.jpg

4"/60 (10.2 cm) Pattern 1911
WNRussian_4-60_m1911_sketch.jpg

4"/60 (10.2 cm) Pattern 1911 in ship-deck mounting
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Gun Characteristics
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Designation 4"/60 (10.2 cm) Pattern 1911
Ship Class Used On During World War I
   Ukraina Class (rearmed), Finn Class (rearmed), Okhotnik Class (rearmed), Vsadnik Class (rearmed)
   Novik, Derzkii class, Schastlivyi class, Izyaslav class, Orfei class, Gavriil class, Gadjibey (Ushakov) class
   Gogland class, Improved Ushakov class DDs.

During Russian Civil War
   Armored trains, river gunboats

During World War II
   Surviving DDs from above, Uragan class, Brilliant class, Dzerzhinski class, Zhemchug class patrol ships
   Gunboats Verny, Peredovoy, Bakinski Rabochii, Al'tfater, Markin, Auxiliary ships
Date Of Design 1911
Date In Service 1911
Gun Weight 2.805 tons (2.850 mt)
Gun Length oa 247.4 in (6.284 m)
Bore Length 240 in (6.096 m)
Rifling Length 208.05 in (5.285 m)
Grooves 24
Lands N/A
Twist N/A
Chamber Volume 461.3 in3 (7.56 dm3)
Rate Of Fire 12 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round HE mod 1915 - 66 lbs. (30 kg)
HE mod 1911 - 66 lbs. (30 kg)
FRAG mod 1915 - 66 lbs. (30 kg)
Shrapnel - 66.36 lbs. (30.1 kg)
Star Shell - 54.01 lbs. (24.5 kg)
Diving - 52.03 lbs. (23.6 kg)
Projectile Types and Weights HE mod 1915 - 38.58 lbs. (17.5 kg)
HE mod 1911 - 38.58 lbs. (17.5 kg)
FRAG mod 1915 - 38.58 lbs. (17.5 kg)
HE mod 1907 - 31.13 lbs. (14.12 kg)
Shrapnel - 39.02 lbs. (17.7 kg)
Star Shell - 33.25 lbs. (15.08 kg)
Diving - 34.72 lbs. (15.75 kg)
Incendiary - 38.8 lbs. (17.6 kg)
Bursting Charge HE mod 1915 - 4.63 lbs. (2.1 kg)
HE mod 1911 - 5.29 lbs. (2.4 kg)
FRAG mod 1915 - 4.15 lbs. (1.88 kg)
Shrapnel - 0.48 lbs. (0.218 kg)
Star Shell - 0.03 lbs. (0.015 kg)
Diving - 6.90 lbs. (3.13 kg)
Projectile Length HE mod 1915 - 5 calibers
HE mod 1911 - 5 calibers
FRAG mod 1915 - 5.18 calibers
HE mod 1907 - 4 calibers
Shrapnel - 4.38 calibers
Star Shell - 4.7 calibers
Diving - 5.14 calibers
Incendiary - 4 calibers
Propellant Charge HE mod 1915 - 11.46 lbs. (5.2 kg)
HE mod 1911 - 11.46 lbs. (5.2 kg)
FRAG mod 1915 - 11.46 lbs. (5.2 kg)
Shrapnel - 11.46 lbs. (5.2 kg)
Star Shell - 8.20 lbs. (3.72 kg)
Diving - 0.88 lbs. (0.4 kg)
Incendiary - 4.74 lbs. (2.15 kg)

Cartridge - 27 lbs. (12.3 kg)
Muzzle Velocity HE mod 1915 - 2,700 fps (823 mps)
HE mod 1911 - 2,700 fps (823 mps)
FRAG mod 1915 - 2,700 fps (823 mps)
HE mod 1907 - 3,000 fps (914.4 mps)
Shrapnel - 2,520 fps (768 mps)
Star Shell - 2,345 fps (715 mps)
Diving - 685 fps (208.8 mps)
Working Pressure 15.75 tons/in2 (2,480 kg/cm2) 
Approximate Barrel Life 800 rounds
Ammunition stowage per gun Novik - 160 rounds
Gavriil class - 150 rounds
Gogland class - 140 rounds
Ushakov class -180 rounds
Uragan (Series I) - 150 rounds
Uragan (Series II) - 200 rounds
Note:  There were also chemical (gas) rounds made from the HE mod 1915.
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Range
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Elevation With 38.58 lbs. (17.5 kg) HE mod 1915 
Range @ 30 degrees 17,600 yards (16,100 m)
Elevation With 38.58 lbs. (17.5 kg) HE mod 1911
Range @ 30 degrees 16,800 yards (15,360 m)
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Mount / Turret Data
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Designation Open Single Mounts
   Metal Factory
   Obukhovski Factory
Weight  Metal Factory:  5.61 tons (5.7 mt)
Obukhovski Factory:  6.051 tons (6.147 mt)
Elevation Metal Factory:  -10 / +30 degrees
Obukhovski Factory:  -6 / +20 degrees
Elevation Rate 3 degrees per second
Train 360 degrees
Train Rate 3 degrees per second
Gun recoil 28 in (71 cm)
Loading Angle Any
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Data from
"Naval Weapons of World War Two" by John Campbell
"Sovetskie Boevye Korabli 1941-45:  IV Vooruzhnie" (Soviet Warships 1941-45:  Volume IV Armament) by A.V. Platonov
"Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland (Russian) Artillery) and "Morskaya Artilleriya Rossiyskogo Flota 1867-1922" (Naval Artillery of the Russian Fleet 1867-1922) both by A.V. Shirokorad
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Special help from Vladimir Yakubov
Page History

21 May 2006 - Benchmark
12 August 2012 - Updated to latest template