JM61 (20 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.
The 20 mm JM61 is a Japanese naval cannon. It is a version of the 20 mm JM61A1 rotary aircraft cannon equipped on Japanese jet fighters.
Vehicles equipped with this weapon
General info
The JM61 has the second-highest rate of fire of any naval weapon, at a whopping 3,000 rounds per minute (RPM). As such, the JM61 can shred through any boat with ease and even dissect larger ships. There is also a modification available to lower the rate of fire to 450 RPM, but the decrease in effectiveness is not worth the extra time of continuous fire.
Available ammunition
Describe the shells that are available for the weapon and their features and purpose. If it concerns autocannons or machine guns, write about different ammo belts and what is inside (which types of shells).
The JM61 has a choice of 3 belts: HEI, API-T, and APDS.
- 20 mm HEI belts: HEF-I · API-T · HEF-I · HEF-I · API-T · HEF-I
- API-T: API-T · HEF-I · API-T · API-T · API-T · HEF-I
- 20 mm APDS belts: APDS · APDS · APDS · APDS
| Penetration statistics | ||||||
|---|---|---|---|---|---|---|
| Shell | Penetration @ 0° Angle of Attack (mm) | |||||
| 10 m | 100 m | 500 m | 1,000 m | 1,500 m | 2,000 m | |
| API-T | 53 | 50 | 41 | 34 | 29 | 25 |
| HEI | 60 | 57 | 50 | 43 | 38 | 34 |
| APDS | 45 | 42 | 31 | 25 | 21 | 18 |
| Shell details | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ammunition | Velocity (m/s) |
Projectile Mass (kg) |
Fuse delay (m) |
Fuse sensitivity (mm) |
Explosive Mass (TNT equivalent) (g) |
Ricochet | |||
| 0% | 50% | 100% | |||||||
| API-T | 1030 | 0.15 | N/A | N/A | N/A | 47° | 60° | 65° | |
| HEF-I | 1030 | 0.1 | 0 | 0.1 | 10 | 79° | 80° | 81° | |
| APDS | 1113 | 0.1 | N/A | N/A | N/A | 75° | 78° | 80° | |
Comparison with analogues
Give a comparative description of cannons/machine guns that have firepower equal to this weapon.
- AK-230 - 30 mm CIWS cannon found on the Pr. 206, has a third the rate of fire, but each turret has 2 barrels, meaning that the Pr. 206 effectively fires 4,000 RPM
- 30 mm/54 AK-630 - 30 mm CIWS cannon mounted on the MPK Pr.12412, has an even higher rate of fire than the JM61 at 5,000 RPM, but no access to any armour-piercing rounds
Usage in battles
Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.
Pros and cons
Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.
Pros:
- Very high rate of fire
- API-T and APDS belts can cut through most ships it meets
Cons:
- Overheats quickly, continuous fire is not recommended
History
Examine the history of the creation and combat usage of the weapon in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the weapon and adding a block "/ History" (example: https://wiki.warthunder.com/(Weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.
Media
An excellent addition to the article would be a video guide, as well as screenshots from the game and photos.
See also
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) |
