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.
| 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 |
| 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 |
- ^Only AP "old model" rounds were produced in 1904-05.
| Elevation | Distance |
|---|---|
| 13 degrees | 7,000 yards (6,405 m) |
| 21 degrees | 8,600 yards (7,869 m) |
| Elevation | Distance |
|---|---|
| 20 degrees | 8,600 yards (7,869 m) |
| 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) |
| 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) |
| 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.
| Designation |
|
|---|---|
| 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) |
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