IJN Mutsuki

IJN Mutsuki

IJN Ayanami

IJN Mutsuki

IJN Ayanami

Japan

I Rank

Battle rating:

AB	RB	SB
3.3	3.3	3.3

Class:

Destroyer

Research:2 900

Purchase:700

Description

The Mutsuki-class, IJN Mutsuki, 1941 (睦月, namesake: January) was the lead ship of the Mutsuki-class destroyers, which were ordered in 1923 after the Washington Navy Treaty restricted the size and number of capital warships. Due to their nature of being planned as a means for unrestricted rapid expansion of the fleet, names weren't assigned to her class until 1928 after crew dissatisfaction and communication problems. Being an improvement over the previous Kamikaze-class destroyer, she saw service in the Sino-Japanese conflicts, and escorted combat fleets during WWII until her sinking at the Battle of the Eastern Solomons.

IJN Mutsuki was introduced in Update 1.89 "Imperial Navy". She is the first destroyer most players will play within the Japanese tree, and gameplay differs significantly from analogous coastal vessels such as the Syonan. The ship is very much a destroyer geared towards long-range engagements, having the most powerful primary armament and the second-most-powerful torpedo setup among its battle rating, further increasing its performance in gunnery battles with relatively good armour. On the other hand, it has only two, very weak, auxiliary guns and no dedicated anti-aircraft weaponry, making it a poor performer in close-range encounters. Overall, it's a difficult ship to play, posing a number of challenges to a player.

General info

Mutsuki can survive a direct torpedo hit

Survivability and armour

Armourfront / side / back

Main fire tower15 / 15 / 0 mm

Hull15 mm (steel)

Superstructure15 mm (steel)

Number of section7

Displacement1 800 t

Crew148 people

The IJN Mutsuki is relatively well armoured and survivable destroyer for its battle rating. Following the typical research path through the Japanese tree, this will be the first ship that's not prone to fires and the first one able to survive a single direct torpedo hit (unless it leads to a secondary explosion).

The destroyer has armour protection and crew count that are above average, although the differences between destroyers in battle rating 3.7 are not high. Protection can be further enhanced with several modifications, although they're standard on all other comparable destroyers as well.

The biggest issue in the ship's survivability is its lack of anti-aircraft armament. It's equipped only with two 7.7 mm auxiliary machine guns that are hardly useful even against wooden gunboats and nearly incapable of taking down anything airborne. Thus, the IJN Mutsuki has to rely on a cover of other ships or time fuse 120 mm shells for protection.

Mobility

Speedforward / back

AB84 / 40 km/h

RB69 / 32 km/h

With a speed of 62 km/h before any modifications, the IJN Mutsuki is the fastest destroyer within its battle rating. Decent speed is supplemented by good manoeuvrability, making it capable of choosing engagements and occasionally even avoiding torpedoes other destroyers would not. The aced top speed is 69 km/h, which is easy enough to get around the battlefield. The rudder shift time is also very respectable, allowing for dodging patterns and making it a hard target to hit with torpedoes.

Mobility Characteristics
Game Mode	Upgrade Status	Maximum Speed (km/h)		Turn Time (s)	Turn Radius (m)
		Forward	Reverse
AB	Stock	62	29	~135.98	~258.51
	Upgraded	84	40	___	___
RB/SB	Stock	___	___	___	___
	Upgraded	69	32	___	___

Modifications and economy

Repair costBasic → Reference

AB220 → 281

RB347 → 444

Total cost of modifications2 970

915

Talisman cost190

Crew training200

Experts1 000

Aces20

Research Aces96 000

Reward for battleAB / RB / SB

30 / 60 / 100 %

100 / 100 / 100 %

Modifications

Seakeeping	Unsinkability	Firepower
Dry-Docking Research: 150 Cost: 45 60 Rudder Replacement Research: 110 Cost: 35 45 Propeller Replacement Research: 150 Cost: 45 60 Engine Maintenance Research: 160 Cost: 50 65	Damage Control Division Research: 150 Cost: 45 60 Fire Division Research: 110 Cost: 35 45 Smokescreen Research: 110 Cost: 35 45 Shrapnel Protection Research: 150 Cost: 45 60 Ventilation Research: 150 Cost: 45 60 New Pumps Research: 160 Cost: 50 65 Ammo Wetting Research: 160 Cost: 50 65	7.7 mm AP belt Research: 150 Cost: 45 60 120mm_jp_type1_base_fuse_naval_he_ammo_pack Research: 150 Cost: 45 60 Auxiliary Armament Targeting Research: 110 Cost: 35 45 7_7mm_lewis_navy_incendiary_ammo_pack Research: 110 Cost: 35 45 120mm_jp_type0_distant_fuse_naval_he_ammo_pack Research: 110 Cost: 35 45 Primary Armament Targeting Research: 150 Cost: 45 60 Improved Rangefinder Research: 150 Cost: 45 60 Torpedo Mode Research: 160 Cost: 50 65 Bomb mortar Research: 160 Cost: 50 65 Mines Research: 160 Cost: 50 65

After researching Tool Set and FPE, the primary research focus should be in Seakeeping and Unsinkability towards tier IV where Torpedo Mode is a worthy upgrade. The lowest priority upgrades are those for the 7.7 mm auxiliary machine guns and, of course, bomb mortar. Note that even with fully upgraded speed and manoeuvrability, primary turrets still handle emergency turns well, making targeting upgrades a lower priority on the list.

Armament

Primary armament

4 х Turret120 mm/45 3rd Year Type cannon

Ammunition240 rounds

Vertical guidance-7° / 33°

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
120 mm Type 1 HE	HE	24	24	24	24	24	24
120 mm Type 1 SAP	SAP	114	89	59	40	30	26
120 mm Type 0 HE	HE-TF	24	24	24	24	24	24

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%
120 mm Type 1 HE	HE	850	20.33	0	0.1	1.95	79°	80°	81°
120 mm Type 1 SAP	SAP	850	20.4	0.015	5	1.87	47°	60°	65°
120 mm Type 0 HE	HE-TF	850	20.33	0	0.1	1.95	79°	80°	81°

Full broadside with all of of the Mutsuki's main guns, note the shockwaves coming from the end of the barrel due to released pressure wave.

The IJN Mutsuki is armed with four single 120 mm mounts, one in the bow, one just aft of the bridge in between the funnels, and two towards the aft. It's comparatively a powerful weaponry excelling especially at longer ranges against its equivalents.

All but the rearmost turrets aim forwards by default, making it relatively easy to hit targets ahead of her with her guns. Additionally, since they are all centrally mounted, it is possible to get all four turrets on target, although when making a turn rear-most turret has to travel over 180° to get a bearing on the target.

Within its battle rating. IJN Mutsuki has both the highest number of and the highest calibre of primary guns. Its guns also have a second-highest muzzle velocity. That said though, it comes with a price - its shells are slow to reload, leading to the lowest sustained rate of fire among comparable destroyers. At the same time, damage output against warships is not as great as reload time might suggest, although still, it's able to hullbreak almost any boat bar some unlucky hits at full-health units. Unfortunately for captains of the Mutsuki, the primary armament has a woeful turret traverse speed of 5°/sec (aced), making it difficult to switch targets and decreasing the overall versatility significantly. It would be very difficult to take the Mutsuki into more confined spaces as the turrets rotate far too slowly to deal with multiple torpedo boats or other craft.

Unlike most of the other nations, and typically to IJN rank II destroyers, it lacks armour-piercing shells for its primary armament what can be an issue when trying to deal with higher ranks. Alternative to standard HE is a researchable modification bringing in the Type 0 time fuse HE shells. Dedicated primarily for anti-aircraft duty, while very potent, the low number of fired shells and long reload time make for a hard choice and a very tricky way to protect itself from airborne attacks.

Secondary armament

2 х Turret7.7 mm Type 92 machine gun

Ammunition1940 rounds

Belt capacity97 rounds

Fire rate600 shots/min

Type 92 machine guns are mounted on a platforms port and starboard to the Mutsuki's bridge.

The secondary armament of the Mutsuki is two type 92 7.7 mm machine guns, each with 1,940 rounds of ammunition. The mountings are both abreast of the bridge, giving good all-around coverage, but no overlapping arcs of fire except for the narrow frontal arc. They do virtually no damage and cannot be relied upon for defence against boats or aircraft.

Note that these are auxiliary weapons, not anti-aircraft, therefore they won't use crew upgrades for anti-aircraft weaponry, even though they are single-mount machine guns with vertical guidance of +60 degrees, making them often automatically engage aircraft.

Additional armament

Setup 112 x 610 mm Type 90 torpedo

Setup 28 x Type 95 depth charge

Setup 312 x 610 mm Type 90 torpedo

2 x Type 95 depth charge

Setup 416 x Type 93 mod1 moored contact mine

Setup 512 x 610 mm Type 90 torpedo

2 x Type 93 mod1 moored contact mine

Graphic detailing port firing arcs for each of the launchers, with a total firing arc of 70° and an overlapping arc of 35°

The IJN Mutsuki carries two triple centre mountings for 610 mm Type 90 torpedoes, along with 6 reload torpedoes in lockers alongside the rearmost funnel. This gives it the ability to reload mid-battle. Each torpedo has a 480 kg TNT equivalent warhead and travels for 7 km at 85 km/h.

This gives it the best torpedo count, torpedo speed and damage at its rank and the second-best range that can be upgraded to by far the longest range through the Torpedo Mode modification that adds 8,000 m for a total of 15 km range, making it capable of reaching opposing spawn area within nearly all maps played on the ship's battle rating.

IJN Mutsuki's torpedo firing arcs are tricky to use. When switching between torpedo aiming modes, the first one to select is for the frontal mount, which not only has a narrower firing arc of the two but its available firing arc is oriented towards the rear of the ship. This creates a situation where most of the unknowing players would only use a very narrow 35° arc, where the first launcher begins to be able to release torpedoes after coming about. Therefore, when manoeuvring bow-first towards the enemy, switch to the rear launcher first; when manoeuvring stern-first towards the enemy, use the front launcher first.

The IJN Mutsuki has an unlockable modification to equip Type 95 depth charges mounted on the Bomb Mortar. It's a tier IV modification, making a comparatively difficult to unlock. It's the only one of two destroyers within its battle rating to be equipped with that modification, making it a fairly unique ship equipment. Mutsuki comes equipped with two mortars: port and starboard, each having one charge loaded and up to 3 spares. Charges cannot be loaded interchangeably, therefore only 4 are available to launch port and 4 starboard. Charges after ejection will be dropped at a constant distance away from the ship, the player has only control over which side should the charges be ejected on. Depth charges cannot be equipped onboard Mutsuki without the bomb mortar, it's the only way they can be deployed.

Charges are extremely situational, and due to a very short range, they are dropped on they are one of the most tricky weapons to use on any destroyer. Even more so, given that their primary target - submarines - are not available in the game.

• 

  Detailed look at the Type 95 ejected from the bomb mortar

• 

  X-ray view of the Mutsuki bomb launcher in-game

• 

  Type 95 at a maximum altitude of its flight trajectory

• 

  Distance to the port at which the depth charge hits the water surface

Usage in battles

IJN Mutsuki is one of the more challenging destroyers in the game, forcing players to rely on positioning, primary weaponry and other teammates.

Her combination of good survivability with speed and long-range cannons make for a respectable fighter at range, however, the lack of secondaries create huge opportunities for hostile torpedo boats or aircraft. IJN Mutsuki in essence is forced to rely on friendlies, is best used in formation assisting other ships, using the cover of their anti-aircraft and trying to always keep hostiles at over 2.5 km, away from the range of their auxiliary guns firing back.

While maps the IJN Mutsuki will fight on include small, narrow passages, those should be avoided for the fear of enemy boats - lack of secondary armament combined with slow, cruiser-like reload time on the primary cannons make for a very challenging task to destroy hostile torpedo boats, and being a destroyer: it has overall a poor manoeuvrability and a large size compared to many opponents it will face, making for a juicy target.

Overall, IJN Mutsuki has a very steep learning curve, where the player simultaneously has to master positioning in warships, leads on various targets at various ranges and long-range torpedo gameplay.

Pros and cons

Destroyers abilities of the destroyer IJN Mutsuki

Pros:

• Main calibre guns with very good firing arcs and shell speed
• Excellent max speed
• Outstanding, long-range torpedoes (in particular after unlocking Torpedo Mode)
• Good survivability

Cons:

• Very vulnerable from the air
• Very vulnerable to attacks from multiple angles
• In essence no secondary or anti-aircraft armament
• The longest reload time on the primary guns among comparable destroyers

History

IJN Mutsuki during its launch date, on 23 June 1924

As the Washington Naval Treaty entered effect, where it substantially limited the quantity of naval weaponry available to the signatory nations, Japan began developing more advanced naval designs to better parry the might of the U.S. Navy.

One such design was the Mutsuki-class destroyers, developed in the early 1920s. Although intended as an improvement over the preceding Kamikaze-class, the Mutsuki-class would become outdated the moment it entered service due to the fact that the even more advanced Fubuki-class was developed in parallel. Nonetheless, Mutsuki-class destroyers still had a prolific service life during WW2, even in the later stages when most were converted into transport vessels.

Mutsuki, the lead ship of her class, was laid down in May 1924 at the Sasebo Naval Arsenal shipyard and was completed in March 1926. The ship was initially commissioned under the name Destroyer No.19, only receiving the name 'Mutsuki' in August 1928.

Mutsuki's combat record began with the outbreak of the Second Sino-Japanese War between China and Japan in the early 1930s. The first battle involving the destroyer during WWII was the invasion of Wake Island. Following the invasion, Mutsuki took part in many more major operations in the Pacific, such as the invasions in the Solomon Islands, New Guinea and Rabaul, while also participating in the Battle of the Coral Sea in 1942.

After undergoing repairs in July 1942, Mutsuki was reassigned to the 8th Fleet and participated in the bombardment of Henderson Field on 24 August 1942. However, Mutsuki met her fate the following day, after an American B-17 Flying Fortress bomber managed a direct hit on the ship's mid section during the Battle of the Eastern Solomons. Mutsuki sunk on that fateful August day and was subsequently struck from Naval records in October 1942.

- From Devblog

Clock on a rear mast

View of the Range Dial on a rear mast while main guns are firing.

The clock clearly visible on a rear mast of the Mutsuki and certain other destroyers is in fact a Range Dial (also known as Concentration Dial).

It enables other ships in a formation that are either behind smoke screen, with a broken range-finders or otherwise have their sight of the enemy hampered to take firing data from a friendly ship.

This technique was first introduced in the British Navy and subsequently adopted throughout other countries until being fully replaced by a short-range radio communications in 1930s, with some ships still bearing the clocks even up to the early days of the WW2.

Range dials are not functional in the game, they're purely visual part of the ship.

Media

Skins

• Skins and camouflages for the IJN Mutsuki from live.warthunder.com.

See also

Links to articles on the War Thunder Wiki that you think will be useful for the reader, for example:

• reference to the series of the ship;
• links to approximate analogues of other nations and research trees.

External links

• [Development] Mutsuki: Frozen in the Crosshairs
• [dreadnoughproject.org] Range Dial

Sasebo Naval Arsenal (佐世保海軍工廠)
Destroyers
Mutsuki-class	IJN Mutsuki
Hatsuharu-class	IJN Hatsuharu
Shiratsuyu-class	IJN Yuudachi
Light Cruisers
Agano-class	IJN Agano
Unique Ships	IJN Yubari
Tanks	Chi-Ha Short Gun

Japan destroyers
	IJN
Momi-class	IJN Momi
Mutsuki-class	IJN Mutsuki · IJN Satsuki
Fubuki-class	IJN Ayanami
Hatsuharu-class	IJN Hatsuharu · IJN Nenohi
Shiratsuyu-class	IJN Yuudachi
Yugumo-class	IJN Yugumo · IJN Hayanami · IJN Kiyoshimo
Shimakaze-class	IJN Shimakaze
Akizuki-class	IJN Akizuki · IJN Hatsuzuki
	JMSDF
Ariake-class*	JDS Yūgure (DD-184)
Harukaze-class	JDS Harukaze (DD-101)
Murasame-class	JDS Murasame (DD-107)
	* Modified Fletcher-class destroyers