GamingDiver / WoWs Legends Ships / Mutsu B

World of Warships: Legends ship guide

Mutsu B

Also called: 陆奥 B Beta

Japan · Tier V · Battleship · Premium · Mutsu Variant

Secondary battleshipPush into secondary range so the auto-battery adds to your main-gun damage.

Playstyle

Anchor a flank at 12-15 km with bow toward the closest threat, then use the speed advantage at 26.5 kn to rotate to the cap that needs a second battleship rather than the one your team already has
Avoid: Using the 26.5-kn speed to push rather than to rotate

Key characteristics

410 mm AP overmatchHeavy HE shellsStrong secondaries (6 km)Engine BoostSpotter planeStiff AP fuse

On this page

Community stats
Playstyle
How to get Mutsu B
Builds
Cohort position
Stats and specs
Armor
Charts
Balance history
Exteriors

Community Data

Mutsu B Community Stats

Log in to GamingDiver and upload your data to see Community Data for Mutsu B: community win rate, damage, survival, spotting, and your own comparison.

Playstyle

Overview

Mutsu B is a Tier V Japanese secondary battleship with top-decile secondary reach out to 5.5 km: the kit rewards closing inside secondary range and letting the auto-fire battery work alongside the mains, not holding mid-range AP lines. Standout traits: top-decile heavy secondary DPM in T5 BBs (280,800) and best HE alpha in T5 BBs (6,500).

Positioning

Anchor a flank at 12-15 km with bow toward the closest threat, then use the speed advantage at 26.5 kn to rotate to the cap that needs a second battleship rather than the one your team already has. Mobility means you can pick which fight you are in; do not waste it by holding center the whole match. The helm answers fast (13 s) but the circle is wide (770 m): weave to spoil aim rather than committing to turns, because a committed turn gives up more water than the quick rudder saves you.

Potato Avoidance

Using the 26.5-kn speed to push rather than to rotate

The mobility advantage is about picking which cap fight you arrive at, not about leading the brawl line; a fast BB that overextends loses HP that the kit cannot trade back.

Signature Traits

ELITE SECONDARIES ↗

Extended secondary range · 5.5 km
Heavy secondary DPM · 280800 secondary
Burny secondaries · 10%

Engine Boost

+12% speed (about +3.2 kt), 80 s duration. Engine Boost consumable lifts top speed enough to open or close a gap deliberately, though not to outrun a committed chase. Uncommon in T5 BBs.

ELITE MAIN BATTERY ↗

Heavy HE shells · 6500 damage
Big-caliber AP overmatch · 28.6 mm

Thick deck armor ↗

76 mm armor deck, top decile of T5 BBs. Eats plunging fire and HE that peers don't.

Stiff AP fuse ↗

68 mm AP arming threshold, worst of T5 BBs. Over-pens thin plates; the trade-off pays off when most targets are battleship belt armor.

Acquisition

How to get Mutsu B

Mutsu B is a Premium ship and not available to unlock in the Tech Tree. Acquisition path: Containers. Container chances are shown as the listed odds of receiving this exact ship, dividing grouped ship-pool odds across the resolved ships and including nested container paths when a crate can drop another crate.

ContainersAppears in official container odds below; availability depends on the container being sold or awarded.

Best listed chance for this ship

Black Friday '20 crate 9.5% V Mutsu B Event · Black Friday '20 crate
Champion's Box 1.9% V Mutsu B Archived · Champion's Box → Black Friday '20 crate
Black Friday Ultimate Crate 1.577% V Mutsu B Event · Black Friday Ultimate Crate → Black Friday '20 crate

Show all 6 containers (3 more)

Ultimate Crate 0.95% V Mutsu B Archived · Ultimate Crate → Black Friday '20 crate
Piñata Chest 0.2% Tier V or VI Premium ship Event · Piñata Chest · 1 of 20 ships
Explorer's Chest 0.148148% One of these ships New · Explorer's Chest · 1 of 27 ships

Official WG availability sources

Official WoWS Legends container odds Containers Official container drop rows linked below include direct and nested effective ship odds.

Show direct source rows

Black Friday '20 crate 9.5% · V Mutsu B
Explorer's Chest 0.148148% · One of these ships
Piñata Chest 0.2% · Tier V or VI Premium ship

Want the full picture? Each container page charts the odds as you open more crates - including ~~pity~~ guaranteed-reward timers and, for GD Supporters, pack math personalized to your port.

Builds

Pair with a commander whose unique skill complements her main armament; check the build tool for current recommendations.

Open in Build Tool →

Commanders frequently paired with this ship AL Fusou Arpeggio Haruna Arpeggio Kirishima

Have a build you swear by? Open it in the Build Tool and hit Save build to share it here.

Cohort position

Hide ▾

Where Mutsu B sits among Tier V BBs (26 ships). Notable standouts are shown first; the rest of the cohort-ranked stats are in the expand below. Acquisition variants (Black Friday, Founders Edition) are counted once with their base ship, not as separate peers.

BestMain battery caliber410 mm (1/26) BestHE shell damage6,500 (1/26) BestAP shell damage12,400 (1 of 2 tied) BestSecondary range5.5 km (1 of 2 tied) Top 10%Hit points58,400 HP (3/26) Top 10%Traverse-to-turn ratio4.44 × (3/26) Top 10%Secondary DPM (per side)280,800 (2/26) Top 25%Rudder shift13 s (4/26) Top 25%Main dispersion193.7 m (5/26) Top 25%Secondary dispersion bracket43.5 (5/26) Top 25%Secondary HE alpha2,400 (5/25) Top 25%Secondary fire chance10% (4/25) Top 25%Deck armor76 mm (6/23) Bottom 25%Stealth profile14.62 km / 11.7 km (21/26 / 21/26) Bottom 25%Turning circle770 m (21/26) Bottom 25%Fires per minute4.8 (23/26) Bottom 25%Displacement40,204 t (22/26) Bottom 25%AA DPS99 (24/26) Bottom 25%AA threat351 (23/26) WorstSmoke fire bloom14.25 km (26/26) WorstAP arming threshold68 mm (1 of 2 tied)

See 27 mid-pack stats

Not standouts for Mutsu B -- here's where she sits on every other ranked stat in the cohort. Stats tagged NORM are tied across more than half the cohort, so the value is the cohort default rather than a standout.

Max speed26.5 kt(10/26) Main battery range15.83 km(12/26) Main battery reload30 s(17/26) Sigma1.7(16/26) HE fire chance30%(15/26) HE DPM104,000(14/26) AP DPM198,400(15/26) Secondary HE pen23 mm(9/25) AP velocity790 m/s(13/26) HE velocity805 m/s(15/26) Acceleration36.8 s(18/26) Engine power80,000 hp(11/26) Turn-speed retention103.9 hp/m(15/26) Power-to-weight1.99 hp/t(13/26) AP pen at 10 km428 mm(16/26) Effective HE DPM (incl. fire)140,150(18/26) AA range5 km(8/26) Flak per wave (expected)570(15/26) Repair charges3(13/26) Max armor330 mm(15/26) Citadel belt305 mm(13/26) Bow armor25 mm(16/26) Stern armor25 mm(15/26) NormAP fuse timer0.03 s(21 of 26 tied at this value) NormAP ricochet start45°(25 of 26 tied at this value) NormAP auto-bounce angle60°(25 of 26 tied at this value) NormRepair heal rate0.5 %/s(24 of 26 tied at this value)

Peers in this cohort

Compare Tier V Battleships

Show all 26 peers

Stats & specs

Customize in the Build Tool →

Survivability

Hit Points58,400

Displacement40,204 t

Hull dimensions

Length x beam at the waterline, with the hull's draft where the client carries one. Ships whose client entry holds only the 260 x 20 m placeholder use a curated real-world figure instead, and any ship we have no trustworthy size for omits this row rather than print the placeholder. Length matters when dodging torpedoes; beam and draft shape how hard the ship is to hit.

224.9 x 33 m (same hull as mutsu)

Armor range13–330 mm

Plate armor thicknesses13, 16, 25, 38, 40, 51, 64, 70, 76, 102, 152, 229, 254, 305, 330 mm

Armor material/layer entries56

Fire resistance

Does not reduce the damage a burning fire does per second: replay-measured burn ticks run at the full rate on every ship. By elimination it lowers how often hits set you on fire; ignition-rate replay data is consistent with that but too confounded by attacker mix to measure the reduction directly.

23.3%

Fire duration60 s

Fire damage

Each fire ticks 0.3% of max HP per second for the full 60 s, so one unattended fire burns 18% of the pool (10,512 HP on this ship). 4 fire points can burn at once. Verified against measured burn ticks in replay data.

0.3% of HP per second

Flood duration40 s

Flood damage

A flood ticks 0.5% of max HP per second for the 40 s duration, so one unattended flood costs 20% of the pool (11,680 HP on this ship). Verified against measured flood ticks in replay data.

0.5% of HP per second

Torp Reduction

Reduces torpedo hit damage. Replay data shows no effect on floods: flood ticks run at the full rate and flood frequency does not decline with protection.

22%

Magazine HP

Per-turret powder-magazine HP, a separate pool from the ship's. Penetrating hits wear it down and the turret is likelier to be knocked out as it falls, so a larger pool keeps the guns firing through punishment that silences a peer's.

29,200

Steering gear HP

Durability of the steering gears. As this pool drops, hits are likelier to jam the rudder; unlike most modules the steering can be knocked out and repaired but is never permanently destroyed.

17,500

Effective HP

Base 58,400 HP plus everything Repair Party can restore: 0.5%/s x 28 s = 8,176 HP per charge, x3 charges = 24,528 HP. Ceiling, not a prediction: a charge only restores damage actually taken, and only the regeneratable share of it. Across 1,826 players in our replay corpus the median ship realized about half of this, mostly because half the charges go unspent — when Repair Party IS pressed it returns ~97% of the per-charge figure above.

82,928

Repairable: penetration50%

Repairable: citadel10%

Repairable: steering gear50%

Main Battery

ModuleArtillery: 410 mm 3rd Year Type

Mounts / barrels4 mounts / 8 barrels

Reload time30 s

Firing range15.8 km

Turret traverse4.5 °/s

Turret armor305 mm

Turret traverse arcs

How far each mount can train, in degrees to either side of the mount's own facing, read from in-game data. A rear turret with ±150° leaves a 60° blind wedge over the bow; one-sided arcs are wing mounts that cover a single side. The data does not say which way each mount faces, so the arcs are listed per mount without bow/stern angles.

4x ±145°

Guns to bear

How far off the bow (or stern) the ship must angle before every main turret can fire: the widest blind wedge among the rear-facing (or forward-facing) mounts, from each mount's trainable arc. Mount facing is inferred from turret stations and verified against known layouts, including Izumo's aft-facing forward turret.

35° off bow / 35° off stern

See the firing-arcs diagram ↓

AP pen max range342 mm

HE fire DPM vs T5 BB36150

Effective HE DPM vs T5 BB140150

Shell Grouping (σ)1.7

Max Horiz Disp

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:

σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30

= (\frac{15828}{30} \cdot \frac{10 - 2.5}{1000} + 2.5) \cdot 30 = 193.7 m

193.7 m at 15.8 km

Max Vert Disp

Vertical dispersion ellipse height at max range:

σ_{V} = σ_{H} \cdot radiusOnMax

= 193.7 \cdot 0.7 = 135.6 m

135.6 m at 15.8 km

Med Horiz Disp

50%-hit horizontal radius:

σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}

= 193.7 \cdot \frac{0.6}{1.7} = 68.4 m

68.4 m at 15.8 km

Med Vert Disp

50%-hit vertical radius:

σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}

= 135.6 \cdot \frac{0.6}{1.7} = 47.9 m

47.9 m at 15.8 km

Turret turn time

180 degrees / 4.5 deg/s traverse speed = 40 s.

40 s

Shells/min

8 broadside guns x 60 / 30 s base reload = 16.

HE shells

HE Damage6,500

HE Velocity805 m/s

Fire Chance30%

HE penetration

68 mm ≈ 410 mm caliber / 6 (standard HE penetration ratio).

68 mm

HE full-salvo alpha

6,500 HE damage x 8 broadside guns = 52,000.

52,000

HE DPM

52,000 HE full-salvo alpha x 60 / 30 s base reload = 104,000.

104,000

Fires/min

16 shells/min x 30% fire chance = 4.8.

4.8

AP shells

AP Damage12,400

AP Velocity790 m/s

Min Ricochet45 deg

Guaranteed Ricochet60 deg

Fuse Timer0.033 s

Fuse Threshold68 mm

AP overmatch

floor(410 mm caliber / 14.3) = 28 mm (AP auto-penetrates plating this thick or less).

28 mm

AP Pen Close

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:

P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}

= 10^{- 7} \cdot 2200 \cdot 1000^{0.69} \cdot {0.41}^{- 1.07} \cdot 790^{1.38} = 669.1 mm

. Matches the in-game spec card.

669.1 mm point-blank

AP Pen Far

Same formula at the ship's max firing range (15.8 km), where the shell has slowed to 486 m/s:

P = 10^{- 7} \cdot 2200 \cdot 1000^{0.69} \cdot {0.41}^{- 1.07} \cdot 486^{1.38} = 342.2 mm

342.2 mm at 15.8 km

AP full-salvo alpha

12,400 AP damage x 8 broadside guns = 99,200.

99,200

AP DPM

99,200 AP full-salvo alpha x 60 / 30 s base reload = 198,400.

198,400

AP AOE Radius

AP shell over-penetration splash radius; scales with shell mass. Wickes 102mm = 3, standard 152mm CL ~ 20, Iowa 406mm ~ 270, Yamato 460mm = 400, Incomparable 650mm = 550 (max). Larger value = bigger splash damage area when AP over-pens.

120

Torpedoes

ModuleTorpedoes: 533 mm single

Launchers / tubes4 launchers × 1 tubes = 4 tubes

Reload time21 s

Projectile speed57 kt

Range6.99 km

Maximum simulated damage

Estimate of WG's in-game value; matches the in-game port screen within ±5%. Saturation: most targets only intersect one hull section, so the sim transfers ~1/3 of the warhead alpha (2/3 when the warhead blast >= 5000 and the burst reaches a second section). For this ship:

D_{sim} = α \cdot c = 29, 800 \cdot 0.333 = 9, 933

≈ 9,933

Maximum damage (ammunition)

The ammunition card's 'Maximum Damage' stat, exact: warhead alpha / 3 plus the blast addend. This is the per-torpedo number most references quote; the 'Maximum simulated damage' row above is WG's separate geometry-sim stat from the launcher spec panel.

10,833

Torpedo detectability1.2 km

Reaction time

How long a target has to dodge after your torpedo is spotted at its detectability range (lower means less warning):

t_{react} = \frac{1.2 km}{57 kt \times 2.6855} = 7.8 s

. The 2.6855 m/s-per-knot game-speed factor is calibrated from in-game measurement; the community's traditional 2.6 reads about 3% slower. Base value; commander torpedo-concealment skills lower it further. Community torpedo-reaction calculator by u/LorenDovah and u/The_ColorOutofSpace.

7.8 s

Flooding chance

Read straight from the game's own data: this torpedo carries a flooding-chance value of 1.75 per hit, shown as

1.75 \times 100 = 175 %

. Torpedo flood values above 100% are normal: in battle the base chance is scaled down by the target's torpedo protection (the Torp Reduction stat on its Survivability card) and any flood-resistance modifiers, so a value above 100% keeps flooding likely even through partial protection. Not shown on the in-game port screen.

175%

Torpedo launcher traverse12 °/s

Torp Turn

Time to rotate the launchers 180 deg:

t_{turn} = \frac{180 °}{12 ° / s} = 15 s

15 s

Torp Arming183 m

Per-side salvo damage

One side firing, all torpedoes hitting: per-side tubes x per-torpedo simulated damage = 2 x 9,933 = 19,866.

19,866

AA Defense

AA mount points5

Maximum AA range

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 2 km; dual-purpose mount auras extend it.

5 km

40 mm Type912×2 40mm

7.7 mm Type923×1 8mm

127 mm Type89 A1 (DP)

Dual-purpose: your secondaries doing double duty against aircraft. The same mounts appear on the Secondary Battery card - shared guns, not extra hardware.

4×2 127mm

Guns127 mm Type89 A1 (DP)

Continuous DPS

Effective DPS in in-game units (raw aura damage × 3.5 × hit probability, summed per contributing aura) - matches the Close-range AA DPS headline's currency. Includes 55 from dual-purpose secondaries firing as AA in this range band.

Range5 km

Guns40 mm Type91

Continuous DPS

Effective DPS: 12 raw aura damage × 3.5 × 0.75 hit probability = 32 - the same in-game units as the Close-range AA DPS headline.

Range2 km

Total DPS in Aura

Far 55 + Medium 32 = 87

Guns7.7 mm Type92

Continuous DPS

Effective DPS: 4 raw aura damage × 3.5 × 0.85 hit probability = 12 - the same in-game units as the Close-range AA DPS headline.

Range1 km

Total DPS in Aura

Far 55 + Medium 32 + Near 12 = 99

Bursts

Each ~2 s wave fires 2 quick salvos of 2 clouds ahead of the attacking squadron - up to 4 clouds per wave × 190 damage each. Planes that fly into a cloud take its damage; clouds dissipate before the next wave lands. Defensive AA Fire, where fitted, multiplies the salvo repeats within each wave.

2 salvos × 2 clouds

Cloud damage

Damage a plane takes for flying into one flak cloud, before any reductions.

190

Cloud spawn chance

Each cloud in the pattern rolls this chance to spawn, so waves average fewer clouds than the maximum. Often called flak 'hit chance', but spawned clouds always damage planes that fly into them - the roll is on spawning.

75%

Wave rate

A flak wave spawns roughly every 2 s - timed frame-by-frame from gameplay footage and consistent across ships.

every ~2 s

Fired by

Flak keeps firing while at least one secondary battery mount is operational - even losing every other AA mount does not stop it.

Secondary battery

Flak zone

The activation band: flak fires while attacking planes are inside it. Clouds are placed ahead of the planes' path, so bursts can land short of 2.5 km or past 5 km - once planes get inside the band, new waves stop. AA range bonuses push the outer edge out; the 2.5 km inner edge does not move.

2.5-5 km

See the AA layers diagram ↓

Secondary Battery

Mounts24

Firing range5.5 km

Shell Grouping (σ)1

Secondary dispersion type

Max dispersion = range (km) × 43.5 + 30. Each dispersion type sets its own slope; this is not a percentage applied to a standard baseline.

Improved (22.5%)

Max secondary dispersion @ 5.5 km

5.5 km × 43.5 + 30 = 269.2 m.

269.2 m

Caliber127 mm

Reload time5 s

HE Damage2,100

Muzzle Velocity725 m/s

Fire Chance8%

Armor Pen21 mm

Show 1 more gun family

Caliber140 mm

Reload time8 s

HE Damage2,400

Muzzle Velocity850 m/s

Fire Chance10%

Armor Pen23 mm

Maneuverability

Engine power80,000 hp

Maximum speed26.5 kt

Turning circle radius770 m

Rudder shift time13 s

Engine power-boost threshold7 kt

Engine spool-up time23 s

Reverse spool-up time11.5 s

Reverse speed

top speed / 4 + 4.9 = 26.5 / 4 + 4.9 = 11.5 kt. The community reverse-speed model from the WoWs ShipBuilder project, the same source as the acceleration model on this card. Base value; speed modifiers scale it. Not shown on the in-game card.

11.5 kt

Crash stop

Seconds from top speed to a dead stop after ordering full reverse: reverse power winds in over the reverse spool-up while water drag does most of the braking. Same community-model simulation as the acceleration times, using the ship's own reverse-power ratio from in-game data. The full curve is on the acceleration chart.

45.5 s

Engine boost threshold (reverse)

Speed below which the engine's built-in power boost applies in reverse. Matches the in-game maneuverability card's reverse threshold (Vampire II reads 10.5 here and the card shows 11; the card rounds half up).

8.1 kt

Acceleration 0-90%

Time to reach 90% of top speed (23.9 kt of 26.5 kt), from our in-house acceleration model.

36.8 s

Acceleration 0-99%

Time to reach 99% of top speed (26.2 kt of 26.5 kt). 99% rather than 100% because true top speed is asymptotic (thrust meets drag), so the last fraction of a knot is never quite gained.

60.1 s

Traverse-to-turn ratio

How many degrees the turret can swing for each degree the hull turns. Turn rate

ω_{hull} = \frac{180}{π} \cdot \frac{V_{max} (m/s)}{R_{turn}} = \frac{180}{π} \cdot \frac{26.5 \cdot 0.5144}{770} = 1.01 ° / s

, so

ratio = \frac{ω_{turret}}{ω_{hull}} = \frac{4.5}{1.01} = 4.4 \times

. Below 5 the turrets drag in a turning fight; 25+ keeps up with any rudder.

4.4× drags

See the full acceleration curve ↓

Concealment

Detectability by sea14.62 km

Detectability by air11.7 km

Smoke firing penalty14.25 km

Detect when firing (sea)

Equal to the ship's main battery range (never below base detectability): firing makes you visible to everyone you can reach. Matches the in-game 'Detect Firing Sea' value on all 8 unmodified captures, and range-modified captures track the modified range.

15.83 km

Detect when firing (air)

Air detectability plus the gun-firing bloom (8.2 km, which tracks main-battery caliber x 0.020). Matches the in-game 'Detect Firing Air' value on every captured ship.

19.9 km

Detect when on fire (sea)

Base sea detectability + 2.0 km while burning; matches the in-game 'Detect Fire Sea' value on every captured ship.

16.62 km

Detect when on fire (air)

Base air detectability + 3.0 km while burning; matches the in-game 'Detect Fire Air' value on every captured ship.

14.7 km

Guaranteed Detect2 km

✦

Consumables

Damage Control Party∞ charges · 80 s reload · 10 s active

Repair Party3 charges · 80 s reload · 28 s active · 8,176 HP (14% of max HP) total heal (per charge)
ƒ
Heal per second (0.5%) x effective active time (28 s) = up to 14% of max HP restored per charge.
· 24,528 HP (42% of max HP) total heal (all charges)
ƒ
14% per charge x 3 charges = up to 42% of max HP if the whole Repair Party loadout is used.
· 292 HP/s (0.5% of max HP) heal per second
ƒ
0.5% of max HP (58,400 HP) per second = 292 HP/s. WoWS heals a flat percent of MAX HP each second, so this rate holds at any health level.

Choose one

Catapult Fighter3 charges · 80 s reload · 90 s active · 5 km patrol radius
ƒ
Derived from the consumable's 30 m grid-unit range (km = grid units x 30 / 1000): $\frac{167 \times 30}{1000} = 5 km$
· 1 squadron size

Observation Seaplane3 charges · 200 s reload · 30 s active · 1 squadron size · Tightens main-battery shell grouping

Secondary Battery Booster3 charges · 160 s reload · 30 s active · +100% grouping · -50% dispersion

Engine Boost4 charges · 70 s reload · 80 s active · +12% speed bonus

See all derived stats

Show ▾

All values are ship base stats with modifications and upgrade changes denoted inline.

Numbers the spec table cannot show directly: alpha-strike math, DPM, dispersion, AP penetration. Click the formula chip on any row to reveal how it is calculated.

Main battery formulas

Shell Grouping (σ)1.7

Max Horiz Disp193.7 m at 15.8 km

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:  $σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30$   $= (\frac{15828}{30} \cdot \frac{10 - 2.5}{1000} + 2.5) \cdot 30 = 193.7 m$

Shell scatter width @ 5 km112.5 m

Horizontal scatter at a fixed 5 km, from the same verified dispersion model as the rows below - a knife-fight-range anchor comparable across ships.

Shell scatter width @ 10 km150 m

How wide your shells scatter at 10 km, from the same dispersion model as the max-range figure above. Picking a fixed range makes this number directly comparable from ship to ship: max-range dispersion makes a longer-range gun look worse even when it's tighter at any common range. The interactive Dispersion tab on the Charts card plots the full curve from 0 to max range.

Shell scatter width @ 15 km187.5 m

Horizontal scatter at a fixed 15 km, from the same verified dispersion model - the long-range anchor. Only shown when the ship's guns reach 15 km.

Max Vert Disp135.6 m at 15.8 km

Vertical dispersion ellipse height at max range: $σ_{V} = σ_{H} \cdot radiusOnMax$ $= 193.7 \cdot 0.7 = 135.6 m$

Shell scatter height @ 10 km88.4 m

How tall the same scatter ellipse is at 10 km. Comparable from ship to ship for the same reason as the width value above. The height/width ratio is a piecewise-linear curve through three points from the ship's own dispersion data:  $radiusOnZero = 0.2$  at 0 m,  $radiusOnDelim = 0.55$  at  $delim \cdot R_{m a x} = 0.5 \cdot 15828 = 7914$  m, and  $radiusOnMax = 0.7$  at 15828 m. Above the kink:  $k = 0.55 + (0.7 - 0.55) \cdot \frac{10000 - 7914}{15828 - 7914} = 0.5895$ , so  $σ_{V} = σ_{H} \cdot k = 150 \cdot 0.5895 = 88.4 m$ .

Med Horiz Disp68.4 m at 15.8 km

50%-hit horizontal radius: $σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}$ $= 193.7 \cdot \frac{0.6}{1.7} = 68.4 m$

Med Vert Disp47.9 m at 15.8 km

50%-hit vertical radius: $σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}$ $= 135.6 \cdot \frac{0.6}{1.7} = 47.9 m$

AP Pen Close669.1 mm point-blank

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}$   $= 10^{- 7} \cdot 2200 \cdot 1000^{0.69} \cdot {0.41}^{- 1.07} \cdot 790^{1.38} = 669.1 mm$ . Matches the in-game spec card.

AP Pen Far342.2 mm at 15.8 km

Same formula at the ship's max firing range (15.8 km), where the shell has slowed to 486 m/s:  $P = 10^{- 7} \cdot 2200 \cdot 1000^{0.69} \cdot {0.41}^{- 1.07} \cdot 486^{1.38} = 342.2 mm$ .

AP pen 5 km533 mm

AP penetration at a fixed 5 km, read off the same PC-validated ballistic curve as AP Pen Close/Far: the shell's impact velocity at that range fed through the canonical community AP formula  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v^{1.38}$ . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.

AP pen 10 km428 mm

AP penetration at a fixed 10 km, read off the same PC-validated ballistic curve as AP Pen Close/Far: the shell's impact velocity at that range fed through the canonical community AP formula  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v^{1.38}$ . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.

AP pen 15 km353 mm

AP penetration at a fixed 15 km, read off the same PC-validated ballistic curve as AP Pen Close/Far: the shell's impact velocity at that range fed through the canonical community AP formula  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v^{1.38}$ . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.

HE flight time @ 10 km5.63 s

How long an HE shell takes to reach a target at a fixed 10 km, from the same numerically integrated trajectory the Charts card plots. The shell slows under quadratic air drag,  $a_{drag} = k ρ v^{2}$ , where  $ρ$  is air density from a standard-atmosphere profile and  $k$  bundles the shell's drag coefficient, caliber and mass:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.505 \cdot {0.41}^{2}}{8 \cdot 938.5} = 3.55 \times 10^{- 5}$ . That runs from a 805 m/s muzzle velocity in 0.02 s steps under gravity 9.8 m/s² until the shell lands, then divides by 2.77: the game clock runs faster than real time, and that factor was measured against stopwatch runs in the Training Room. Lower is better, since a faster shell is harder to dodge and needs less lead.

AP flight time @ 10 km5.43 s

How long an AP shell takes to reach a target at a fixed 10 km, from the same numerically integrated trajectory the Charts card plots. The shell slows under quadratic air drag,  $a_{drag} = k ρ v^{2}$ , where  $ρ$  is air density from a standard-atmosphere profile and  $k$  bundles the shell's drag coefficient, caliber and mass:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.41 \cdot {0.41}^{2}}{8 \cdot 1000} = 2.71 \times 10^{- 5}$ . That runs from a 790 m/s muzzle velocity in 0.02 s steps under gravity 9.8 m/s² until the shell lands, then divides by 2.77: the game clock runs faster than real time, and that factor was measured against stopwatch runs in the Training Room. Lower is better, since a faster shell is harder to dodge and needs less lead.

HE penetration68 mm

68 mm ≈ 410 mm caliber / 6 (standard HE penetration ratio).

AP overmatch28 mm

floor(410 mm caliber / 14.3) = 28 mm (AP auto-penetrates plating this thick or less).

AP AOE Radius120

AP shell over-penetration splash radius; scales with shell mass. Wickes 102mm = 3, standard 152mm CL ~ 20, Iowa 406mm ~ 270, Yamato 460mm = 400, Incomparable 650mm = 550 (max). Larger value = bigger splash damage area when AP over-pens.

Broadside guns used for alpha8

All 8 barrels bear on the broadside.

Turret turn time40 s

180 degrees / 4.5 deg/s traverse speed = 40 s.

HE full-salvo alpha52,000

6,500 HE damage x 8 broadside guns = 52,000.

AP full-salvo alpha99,200

12,400 AP damage x 8 broadside guns = 99,200.

HE DPM104,000

52,000 HE full-salvo alpha x 60 / 30 s base reload = 104,000.

AP DPM198,400

99,200 AP full-salvo alpha x 60 / 30 s base reload = 198,400.

Shells/min16

8 broadside guns x 60 / 30 s base reload = 16.

Fires/min4.8

16 shells/min x 30% fire chance = 4.8.

Torpedoes

Torpedo detectability1.2 km

Estimated torpedo reaction time7.8 s

detectability / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement; the community's traditional 2.6 reads about 3% slower).

Torpedo speed57 kt

Travel time to max range45.7 s

range / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement).

Torpedo module damage900

Per-torpedo module/blast damage parameter from in-game data. Most torpedoes carry 500 to 2,000; ships announced by WG as dealing increased module damage carry 9,000 to 12,000, so their hits knock out engines, rudders, and turrets far more often. Comparative figure; the exact module-HP conversion is not published.

Tube count4

4 launchers x 1 tubes.

Per-side salvo2 torpedoes

tube count / 2 (symmetric port/starboard launcher layout; common on cruisers and battleships with deck torpedoes).

Full-salvo damage39,732

All tubes hitting one target: tubes x per-torpedo simulated damage = 4 x 9,933 = 39,732.

Per-side salvo damage19,866

One side firing, all torpedoes hitting: per-side tubes x per-torpedo simulated damage = 2 x 9,933 = 19,866.

AA defense

AA DPS at max range55

Only families that reach 5 km contribute at the outer edge of the AA bubble. In-game families: 40mm Vickers double 2x2 -> 32 DPS @ 2 km; 7 7mmLewis 3x1 -> 12 DPS @ 1 km; 127mm40 Type 89 4x2 -> 55 DPS @ 5 km.

Maximum AA range5 km

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 2 km; dual-purpose mount auras extend it.

AA DPS layered by range55 DPS @ 5 km, 87 DPS @ 2 km, 99 DPS @ 1 km

Cumulative AA DPS at each family range threshold. Inner ranges stack the outer families, so a target closing the distance hits stronger AA bubbles as it crosses each band.

AA DPS at point-blank99

Sum of every family's average DPS, achievable only inside the closest-range family (1 km).

AA threat index351

SUM over AA auras of (aura DPS x aura range km). A plane crossing the AA bubble is exposed to each aura for a time proportional to that aura's range, so long-reach DPS is worth more than the same DPS in a short bubble. Units: DPS*km; used to rank overall AA threat across the cohort.

Near aura range1 km

Secondary battery dispersion

Secondary dispersion typeImproved (22.5%)

Max dispersion = range (km) × 43.5 + 30. Each dispersion type sets its own slope; this is not a percentage applied to a standard baseline.

Max secondary dispersion @ 5.5 km269.2 m

5.5 km × 43.5 + 30 = 269.2 m.

Secondary dispersion @ 5 km247.5 m

Same per-type line evaluated at a fixed 5 km: 5 km × 43.5 + 30 = 247.5 m.

Secondary battery firepower

Secondary DPM (per side)280,800

Sum across all secondary families of (per-side barrels × 60 / reload_s × alpha), where per-side barrels = mounts × barrels-per-mount / 2 (the guns that bear on one broadside target). Per-family: 4×2 127 mm (4/side) × 60/5 × 2100 = 100,800 + 20×1 140 mm (10/side) × 60/8 × 2400 = 180,000. Assumes every shell hits (real hit rate is lower; the Brawl matchup tool on the Compare page folds in dispersion + target armor).

Max HE alpha2400

Maximum HE damage per shell across secondary HE families. Best on this ship: 2400 from the 140 mm family.

Max HE fire chance10%

Maximum per-shell fire chance across secondary HE families (before target fire resistance is applied). Best on this ship: 10% from the 140 mm family.

Max HE pen23 mm

Maximum HE armor penetration across secondary HE families (caliber × 1/6 for most nations; 1/4 for German/UK BBs). Shells whose pen falls under a plate's armor thickness shatter for 0 hull damage though fire chance still applies. Best on this ship: 23 mm from the 140 mm family.

Armor Beta

Hull HP 58,400, distributed across 5 hull zones, each with its own plate thicknesses, saturation cap, and pen thresholds. HP caps are the exact in-game values, not estimated.

Bow & stern25 mm

Overmatched by 32+ AP guns across the bracket. Can’t reliably bow-tank; gets bow-citadelled and overpenned.

Belt / citadel305 mm

Citadels come from a flat broadside at close range; held past ~30° of angle, AP shatters or bounces.

Farming16 mm

Superstructure and extremities take HE pens and AP overpens from nearly any gun: steady chip damage. Fire resistance 23%, fires burn 60s. Range-by-range in the Compare tool →

Section	Plates	HP cap	Threats	Tactic
Bow	25 mm primary (range 25–76 mm)	3,200 (5% of HP)	Overmatched by 380mm+ AP (Bayern, Gneisenau)Angle bounces 356mm25 mm: HE pens from 150mm+	Bow-tank fits behind this exterior plate. Saturation is FAST here; the cap is often only a few thousand HP.
Hull (midship)	25 mm primary (range 25–254 mm)	43,800 (75% of HP)	Overmatched by 380mm+ AP (Bayern, Gneisenau)Angle bounces 356mm25 mm: HE pens from 150mm+	Largest HP pool. Citadel sits behind these plates; thinner deck and side plating absorb the rest.
Stern	25 mm primary (range 25–305 mm)	2,200 (4% of HP)	Overmatched by 380mm+ AP (Bayern, Gneisenau)Angle bounces 356mm25 mm: HE pens from 150mm+	Mirror of bow. Same fast saturation.
Citadel	305 mm primary (range 13–305 mm)	≈ 165,500 (effectively no cap)	Citadel pen: full damageOver-pen: ×0.10 damage	Effectively no cap; citadel pool sits at ~165k HP on every ship. An AP citadel penetration deals the shell's full damage, the biggest single hit available; only over-penetrations are damped, to ×0.10.
Superstructure	16 mm	1,100 (2% of HP)	Any HE ≥16 mm pens at full damage	Any HE ≥16 mm pens at full damage. HE-spam target, and the section saturates fast (often only a few thousand HP).
Turret (module, per magazine)	separate HP pool, does not drain ship HP	29,200 magazine HP	Turret knocked out	Per-turret powder-magazine HP, a separate pool that does not drain ship HP. As it is worn down the turret is likelier to be knocked out, and a smaller pool gets there faster.
Secondary mount (140 mm mount)	separate HP pool, does not drain ship HP	800 per-mount HP	Destroyed at 0 HP	Per-mount HP for the heaviest secondary on this ship. A mount destroyed at 0 HP is out for the rest of the battle; DCP does not repair destroyed mounts. Smaller (lighter-caliber) secondaries typically share the same HP value.
AA mount (40 mm mount)	separate HP pool, does not drain ship HP	200 per-mount HP	Destroyed at 0 HP	Per-mount HP for the heaviest AA on this ship. An AA mount destroyed at 0 HP stops shooting down planes for the rest of the battle; DCP does not repair destroyed mounts. HE shells specifically target AA mounts since the small-caliber HP pool falls fast.
Rudder (module)	separate HP pool, does not drain ship HP	17,500 module HP	Incapacitated at 0 HP	When module HP reaches 0 the rudder locks at its current angle until DCP repairs it. Repair via Damage Control Party.

Saturation cap = HP a section can absorb before further damage to it is reduced (the "bow-tank" effect). Citadel pool is ~165k on every ship (effectively no cap); damage is gated by pen/over-pen multipliers instead. Superstructure saturates fast but HE always pens regardless of the plate thickness. Rudder (and other module HPs) are a separate pool from ship HP: damaging a module doesn't drain ship HP. Incapacitated modules like the rudder and engine are restored by DCP, but secondary and AA mounts destroyed at 0 HP stay out for the rest of the battle.

Open in Charting Tool

Ship Charts

Balance History

Balance updates affecting Mutsu B. Cards are condensed; use each source link for full context.

Nerf ×2Buff ×6Main Battery ×2Torpedo ×2Consumable ×2

2026-04-30

Ministry of Balance: Viva la Marina!

Improved dispersion with a new variant of Japanese dispersion inspired by Amagi.
Turret rotation speed increased by approximately 18%.
Rudder-shift time reduced by approximately 6% to match that of her sister ship Nagato.
Added Engine Boost to slot 4.
Consumable duration: 80 s.
Cooldown time: 70 s.
Maximum Speed: +12%.
Turret rotation speed increased by approximately 18% (main battery 180° turn time improved from about 47.2 s to 40 s; traverse from about 3.8°/s to 4.5°/s).
Rudder-shift time reduced by approximately 6% (from about 13.8 s to 13 s; to match that of her sister ship Nagato).

Read the full official post

2025-11-27

Holiday Update: Christmas on the Waves

Enabled torpedo turning mechanic, increasing torpedo firing angles.
Torpedo launcher 180° turn time increased from 7.2 to 15 seconds.
Secondary battery firing range increased from 4.0 to 5.5 km.
Secondary battery dispersion for 127 mm guns reduced.
Secondary battery dispersion for 140 mm guns increased.

Read the full official post

Exteriors

Skins & permanent camouflages

Every custom exterior Mutsu B can equip, from in-game data.

DefaultThe ship’s standard exterior

Primary official WG sources

Filtered to official World of Warships: Legends pages where this ship is a focus, reward, line member, or high-context variant mention.

2022-12-08 · Patch notes December Update: The Most Wonderful Tide of the Year Patch notes 2025-11-27 · Patch notes Holiday Update: Christmas on the Waves Patch notes 2026-04-30 · Patch notes May Update: From Rome to Edo Patch notes

Mutsu B

Mutsu B Community Stats

Mutsu B Community Stats

Playstyle

Overview

Positioning

Potato Avoidance

Signature Traits →

How to get Mutsu B

Best listed chance for this ship

Builds

Cohort position

Peers in this cohort

Stats & specs

See all derived stats

Main battery formulas

Torpedoes

AA defense

Secondary battery dispersion

Secondary battery firepower

Armor Beta

Ship Charts

Balance History

Ministry of Balance: Viva la Marina!

Holiday Update: Christmas on the Waves

Skins & permanent camouflages

Primary official WG sources

Signature Traits