Description

This gun was built under a license purchased from the French designer Canet in 1891. It went into production in 1892 at the OSZ and Perm' factories in Russia. Between 1891 and 1921 OSZ made 551 guns and Perm' made an additional 248 guns. These guns were used as anti-torpedo boat weapons on almost every Russian ship built between 1892 and 1910.

In the fall of 1914 a new AA mounting was developed for this weapon with a maximum elevation of +50 degrees. 80 mounts were built of which 40 were sent to the Baltic fleet, 19 to the Black Sea fleet plus a further 12 used as coastal defense weapons. In 1916 a new mounting was developed which increased the elevation to +70 degrees, with four of these guns being completed. In the 1920s a new design increased the elevation still further to +75 degrees. This last mounting remained in production until the end of 1920s. These weapons were continually improved during their service life and in 1941 there were still 69 guns in active service in the Soviet Navy.

Some of these weapons were captured by the Japanese during the Russo-Japanese war. The Japanese then produced their own projectiles for them.

Constructed of barrel, fastened by casing and an extra ring. The breech was a simple piston-type.

Actual bore diameter was 7.5 cm (2.95"), not 7.62 cm (3.0").

The data that follows is for Russian guns except where specified.

Gun Characteristics

Designation Russian: 75 mm/50 (2.9") Pattern 1892
French: 7.5 cm/50 (2.9") Canet Model 1891
Ship Class Used On Used on almost every ship in the Russian Navy between 1892 and 1914
Date Of Design N/A
Date In Service 1892
Gun Weight 1,938 lbs. - 2,006 lbs. (879 kg - 910 kg)
Gun Length oa 147.64 in (3.75 m)
Bore Length 142.36 in (3.616 m)
Rifling Length 115.87 in (2.943 m)
Grooves 30
Lands N/A
Twist N/A
Chamber Volume 208.7 in3 (3420 cm3)
Rate Of Fire 12-15 rounds per minute

Ammunition

Type Fixed
Weight of Complete Round AP "old model" 1 : N/A
HE mod 1907: 21.16 lbs. (9.6 kg)
HE AA Grenade: N/A
Shrapnel: 21.16 lbs. (9.6 kg)
Shrapnel (Japanese): 23.52 lbs. (10.67 kg)
Shrapnel (Rozenberg): 23.04 lbs. (10.45 kg)
Diving: 17.42 lbs. (7.9 kg)
Projectile Types and Weights AP "old model": 10.8 lbs. (4.9 kg)
HE mod 1907: 10.83 lbs. (4.91 kg)
HE AA Grenade: 12.63 lbs. (5.73 kg)
Shrapnel: 10.83 lbs. (4.91 kg)
Shrapnel (Japanese): 13.16 lbs. (5.97 kg)
Shrapnel (Rozenberg): 12.68 lbs. (5.75 kg)
Diving: 9.92 lbs. (4.5 kg)
Bursting Charge AP "old model": none
HE mod 1907: 1.15 lbs. (0.52 kg)
HE AA Grenade
Shrapnel: 0.15 lbs. (0.068 kg)
Shrapnel (Japanese): 0.19 lbs. (0.085 kg)
Shrapnel (Rozenberg): 0.18 lbs. (0.082 kg)
Diving: 1.68 lbs. (0.76 kg)
Projectile Length AP "old model": 2.7 calibers
HE mod 1907: 3.36 calibers
HE AA Grenade
Shrapnel: 4.0 calibers
Shrapnel (Japanese): 4.4 calibers
Shrapnel (Rozenberg): 4.5 calibers
Diving: 3.44 calibers
Propellant Container Type and Weight Cartridge: 6.68: 7.06 lbs. (3.03 - 3.2 kg)
Propellant Charge 3.31 lbs. (1.5 kg) for all
0.44 lbs. (0.2 kg) for diving round
Muzzle Velocity AP "old model": 2,700 fps (823 mps)
HE mod 1907: 2,700 fps (823 mps)
HE AA Grenade: 2,450 fps (747 mps)
Shrapnel: 2,420 fps (738 mps)
Shrapnel (Japanese): 2,700 fps (823 mps)
Shrapnel (Rozenberg): 2,400 fps (731.5 mps)
Diving: 750 fps (229 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
  1. ^Only AP "old model" rounds were produced in 1904-05.

Range

Range with 10.8 lbs. (4.9 kg) AP "old model"
Elevation Distance
13 degrees 7,000 yards (6,405 m)
21 degrees 8,600 yards (7,869 m)
Range with 10.83 lbs. (4.91 kg) HE mod 1907
Elevation Distance
20 degrees 8,600 yards (7,869 m)
Range with 12.63 lbs. (5.73 kg) HE AA Grenade
Elevation Distance
20 degrees 8,400 yards (7,686 m)
25 degrees 9,200 yards (8,418 m)
35 degrees 10,000 yards (9,150 m)
AA Ceiling @ 60 degrees 16,200 feet (4,908 m)
Range with 23.04 lbs. (10.45 kg) Shrapnel (Rozenberg)
Elevation Distance
19.4 degrees 8,200 yards (7,503 m)
32.2 degrees 9,400 yards (8,601 m)
40 degrees 9,800 yards (8,967 m)

Armor Penetration

Armor Penetration with 10.8 lbs. (4.9 kg) AP "old model" Shell
Elevation Range Side Armor Striking Velocity Angle of Fall
0 degrees 0 yards (0 m) 4.7 in (120 mm) 2,600 fps (792.5 mps) 0

Data from "Imperial Russian Navy Cruiser Varyag" for Krupp steel.

Mount/Turret Data

Designation
  • Single Mounts:
    • Canet
    • OSZ mod 1911
    • Meller
    • Pattern 1906
    • Pattern 1908
    • Casemate Mount mod 1906
  • AA mounts:
    • Pattern 1914
    • OSZ mod 1916 AA mount modified from Meller's mount
    • Pattern 1926
    • Pattern 1928
Weight Canet: about 3.94 tons (4 mt)
OSZ mod 1911: 2.515 tons (2.555 mt)
Meller: 1.693 tons (1.72 mt)
Pattern 1906: 4.351 tons (4.42 mt)
Pattern 1908: about 3.94 tons (4 mt)
Casemate Mount mod 1906: 4.354 tons (4.423 mt)
OSZ mod 1916 AA: about 1.969 tons (2 mt)
Elevation Canet: -15 / +20 degrees
OSZ mod 1911: -10 / +20 degrees
Meller: -15 / +20 degrees
Pattern 1906: -15 / +20 degrees
Pattern 1908: -15 / +25 degrees
Casemate Mount mod 1906: -15 / +25 degrees
AA Pattern 1914: -? / +50 degrees
OSZ mod 1916 AA: -? / +70 degrees
AA mod 1928: -? / +75 degrees
Rate of Elevation Manual operation, only
Train 360 degrees all
Rate of Train Manual operation, only
Gun Recoil Canet: 7.87 in (20 cm)
OSZ mod 1911: 13 in (33 cm)
Meller: 15.74 in (40 cm)
Pattern 1906 -7.87 in (20 cm)
Pattern 1908: 7.87 in (20 cm)
Casemate Mount mod 1906: 7.87 in (20 cm)
OSZ mod 1916 AA: 15.74 in (40 cm)

Additional Pictures

Sources

Data from:

  • "Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland [Russian] Artillery) by A.V. Shirokorad
  • "Imperial Russian Navy Cruiser Varyag" article by Adam Smigielski in "Warship" Volume III

Special help from Vladimir Yakubov