20 cm/50 3rd year type No.2 (203 mm)
Contents
Description
Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.
Vehicles equipped with this weapon
General info
Tell us about the tactical and technical characteristics of the cannon or machine gun.
Available ammunition
| Penetration statistics | |||||||
|---|---|---|---|---|---|---|---|
| Ammunition | Type of warhead |
Penetration @ 0° Angle of Attack (mm) | |||||
| 1,000 m | 2,500 m | 5,000 m | 7,500 m | 10,000 m | 15,000 m | ||
| Type 0 HE | HE | 61 | 61 | 61 | 61 | 61 | 61 |
| Type 91 AP | APHEBC | 362 | 321 | 263 | 218 | 182 | 139 |
| Type 0 HE-TF | HE-TF | 61 | 61 | 61 | 61 | 61 | 61 |
| Shell details | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ammunition | Type of warhead |
Velocity (m/s) |
Projectile mass (kg) |
Fuse delay (s) |
Fuse sensitivity (mm) |
Explosive mass (TNT equivalent) (kg) |
Ricochet | |||||
| 0% | 50% | 100% | ||||||||||
| Type 0 HE | HE | 835 | 125.4 | 0 | 0.1 | 8.57 | 79° | 80° | 81° | |||
| Type 91 AP | APHEBC | 835 | 125.85 | 0.05 | 9 | 3.26 | 48° | 63° | 71° | |||
| Type 0 HE-TF | HE-TF | 835 | 125.4 | 0 | 0.1 | 8.57 | 79° | 80° | 81° | |||
Comparison with analogues
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Usage in battles
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Pros and cons
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Pros:
Cons:
History
The first guns built for heavy cruisers of the Imperial Japanese Navy were the 20 cm 3rd year type No.1, which was only 7.9 inches in diameter. However, the Washington and London Naval Treaties allowed heavy cruisers to have a maximum of 8-inch guns and the IJN wanted to use the maximum allowed caliber for the best possible performance. The 20 cm 3rd Year Type No. 2 was built between 1930 and 1931 to serve as their needed 8-inch guns and was first used to refit their existing heavy cruisers of the Aoba-class, Furutaka-class, and Myoko-class.
When the Mogami-class was first built in 1931, it was a light cruiser with 155 mm/60 3rd Year Type guns to conform with the Washington Naval Treaty restricting light cruisers to 6.1-inch guns. However, Japan was never happy with the total tonnage allotted to their capital ships and the other restrictions by the 1922 treaty and ordered the 20 centimeter/50-calibers 3rd Year Type No.2 guns to eventually re-arm the Mogami-class cruisers while officially they were intended as spares for their 8-inch gun armed cruisers built under the treaty. When the start of the Second Sino-Japanese War in 1937 was met with condemnation by the League of Nations, Japan ultimately withdrew their membership and with no treaties to hold them back, began refitting their Mogami-class ships with their 20 cm/50 3rd Year Type. This process occurred between 1939 and 1940 leaving them ready for combat during the Pacific Theater of World War II.
The first ships to be laid down with these guns were the Takao-class which were first planned as Mogami-class ships, but they were built after Japan abandoned the treaty and later the Tone-class heavy cruisers, which were similarly planned with 155 mm/60 3rd Year Type 6.1-inch guns, were laid down with the 8-inch guns. The guns had notable problems with dispersion early in their service life, but a stiffening of their hulls and delaying the firing of individual shells was found to alleviate the problem somewhat. Japan never used triple mounts before the 7.9-inch guns and had problems with the rounds knocking each other off course. They were also intended as dual-purpose guns but lacked the proper training and elevation gears to serve in an anti-aircraft role.
Media
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See also
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- reference to the article about the variant of the cannon/machine gun;
- references to approximate analogues by other nations and research trees.
External links
Paste links to sources and external resources, such as:
- topic on the official game forum;
- other literature.
| Japan naval cannons | |
|---|---|
| 20 mm | JM61 · Type 98 |
| 25 mm | 25 mm/60 Type 96 |
| 37 mm | Type 4 · Type 11 pattern 1922 |
| 40 mm | 40 mm/62 Vickers |
| 57 mm | Type 97 |
| 75 mm | Type 88 AA |
| 76 mm | 3-inch/40 Type 41 · 8 cm/40 3rd Year Type · 8 cm/60 Type 98 |
| 100 mm | 100/65 mm Type 98 mod A |
| 120 mm | 120 mm/45 3rd Year Type · 120 mm/45 10th year type |
| 127 mm | 5 inch/40 Type 89 · 127 mm/50 3rd Year Type |
| 140 mm | 140 mm/50 3rd Year Type |
| 152 mm | 6-inch/45 Type 41 · 15 cm/50 Type 41 |
| 155 mm | 155 mm/60 3rd Year Type |
| 200 mm | 20 cm 3rd year type No.1 |
| 203 mm | 20 cm/45 Type 41 · 20 cm/50 3rd year type No.2 |
| 356 mm | 36 cm/45 Type 41 |
| 410 mm | 410 mm/45 Type 3 |
| Foreign: | |
| 20 mm | 20 mm/70 Oerlikon Mk.II (USA/Britain) |
| 40 mm | Bofors L/60 Mark 1 (USA) · Bofors L/60 Mark 2 (USA) · Bofors L/60 Mark 3 (USA) |
| 47 mm | 3 pdr QF Hotchkiss (Britain) |
| 76 mm | 3-inch Mark 10 (USA) · 3 inch Mk.33 (USA) · 3-inch Mk.34 (USA) |
| 120 mm | 4,7-inch/40 Armstrong (Britain) |
| 127 mm | 5 inch/38 Mk.12 (USA) |
| 305 mm | 12-inch/45 Vickers (Britain) · 12-inch/50 Vickers (Britain) |
