GamingDiver / WoWs Legends Ships / Massachusetts B

World of Warships: Legends ship guide

Massachusetts B

Also called: 马萨诸塞 B Beta

U.S.A. · Tier VII · Battleship · Premium · Massachusetts Variant

Bow-tank battleshipA bow-on anchor: thick plate eats incoming fire while the team trades from behind.

Playstyle

Anchor a flank at 14-17 km with bow toward the closest threat
Avoid: Torpedo Boat Brawling; with no torpedoes you cannot trade back a fight fought inside enemy torpedo range

Key characteristics

406 mm AP overmatchStrong secondaries (7 km)Lobs over islandsSpotter planeThickest plateSlow

On this page

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

Community Data

Massachusetts B Community Stats

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

Playstyle

Overview

Massachusetts B is a Tier VII American bow-tank battleship: top-decile bow and deck plate shrugs what peer guns cannot crack, so she holds the line bow-in and soaks fire while the team trades around her. Standout traits: top-decile deck armor in T7 BBs (102 mm) and best DCP duration in T7 BBs (20 s).

Positioning

Anchor a flank at 14-17 km with bow toward the closest threat. Rotate one or two map cells with the team rather than holding solo; a battleship alone on a flank is a free focus target for the enemy. At 27.5 kn you cannot re-cross the map, so the flank you pick early is the one you fight all game; choose it for where the enemy battleships will end up, not where they start. Once the rudder is over she turns tightly for her cohort (710 m), so a committed turn costs less water than most of what she is fighting.

Potato Avoidance

Torpedo Boat Brawling

With no torpedoes you cannot trade back a fight fought inside enemy torpedo range. Hold the band where your guns and secondaries punish them while their fish still fall short, and lean on armor and volume of fire instead of closing the last few kilometers into a spread you have no answer for.

Signature Traits

ELITE ARMOR ↗

Thickest plate · 439 mm
Thick deck · 102 mm
Strong torpedo belt · 46%

Long DCP window ↗

20 s Damage Control duration, best of T7 BBs. Stays fire / flood immune longer per activation.

Tighter secondary dispersion ↗

Improved secondary dispersion bracket (slope 27), top decile of T7 BBs. The bracket determines per-meter-of-range dispersion; lower slope = tighter cone. NB this is DISPERSION, not sigma -- secondary sigma is the separate 'Sharp secondaries' trait.

High-arc AP shells ↗

16.4° AP impact angle at max range, top decile of T7 BBs. Lobs over island cover.

Slow AP shells ↗

701 m/s AP muzzle velocity, bottom decile of T7 BBs. Lobby trajectory, more lead, easier to dodge at range.

Bow-in or broadside-dead

Angled bow-on, the bow and belt bounce AP that would citadel a flat-side peer -- but show a full broadside even for one salvo and you hand out a citadel. Commit to a lane you can hold angled; you can't afford to swing broadside to dodge torpedoes.

Acquisition

How to get Massachusetts B

Massachusetts B is a Premium ship and not available to unlock in the Tech Tree. Acquisition paths: Containers and Campaign. 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.
CampaignEarnable in the Big Mamie campaign; campaign ships can later return through other limited methods.

Best listed chance for this ship

Black Friday '21 crate 0.5% VII Massachusetts B + Flag: Massachusetts Black Event · Black Friday '21 crate
Piñata Chest 0.166667% Tier V, VI, or VII Premium ship Event · Piñata Chest · 1 of 18 ships
Explorer's Chest 0.115385% One of these ships New · Explorer's Chest · 1 of 26 ships

Show all 6 containers (3 more)

Champion's Box 0.1% VII Massachusetts B + Flag: Massachusetts Black Archived · Champion's Box → Black Friday '21 crate
Black Friday Ultimate Crate 0.0835% VII Massachusetts B + Flag: Massachusetts Black Event · Black Friday Ultimate Crate → Black Friday '21 crate
Ultimate Crate 0.05% VII Massachusetts B + Flag: Massachusetts Black Archived · Ultimate Crate → Black Friday '21 crate

Official WG availability sources

Big Mamie campaign breakdown Campaign Start: 2020-12-21 · End: 2021-01-31 Official campaign breakdown naming this ship as a campaign/reward-context ship; explicit source windows are used when present, otherwise the end date is inferred from the next indexed campaign breakdown when available.
Official WoWS Legends container odds Containers Official container drop rows linked below include direct and nested effective ship odds.
Through the Spy Glass: Tulsa Ship feature / release Start: 2023-06-21 · End: open/unknown end Official Through the Spy Glass feature for this ship; useful as a release/availability source, but not a guaranteed current-store listing.
Through the Spy Glass: Salem Ship feature / release Start: 2023-06-29 · End: open/unknown end Official Through the Spy Glass feature for this ship; useful as a release/availability source, but not a guaranteed current-store listing.

Show direct source rows

Black Friday '21 crate 0.5% · VII Massachusetts B + Flag: Massachusetts Black
Explorer's Chest 0.115385% · One of these ships
Piñata Chest 0.166667% · Tier V, VI, or VII 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 →

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Cohort position

Hide ▾

Where Massachusetts B sits among Tier VII BBs (49 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.

BestSecondary dispersion bracket27 (1 of 3 tied) Top 10%Turning circle710 m (3/49) Top 10%Max armor439 mm (5/49) Top 25%AP shell damage13,100 (11/49) Top 25%Acceleration34.8 s (13/49) Top 25%Secondary range7 km (9/49) Top 25%AA DPS592 (12/49) Top 25%AA threat2,018 (13/49) Top 25%Flak per wave (expected)1,725 (7/49) Top 25%Deck armor102 mm (6/46) Bottom 25%Max speed27.5 kt (43/49) Bottom 25%Stealth profile15.47 km / 12.38 km (38/49 / 38/49) Bottom 25%Smoke fire bloom14.92 km (40/49) Bottom 25%HE velocity803 m/s (37/48) Bottom 25%Engine power130,000 hp (39/49) Bottom 25%Power-to-weight2.77 hp/t (39/49) Bottom 25%Citadel belt274 mm (37/48) Bottom 10%Traverse-to-turn ratio3.5 × (48/49) WorstSecondary fire chance5% (1 of 11 tied) WorstSecondary HE pen21 mm (1 of 11 tied) WorstAP velocity701 m/s (1 of 3 tied) WorstNo torpedoes (33 of 49 in cohort)

See 28 mid-pack stats

Not standouts for Massachusetts 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.

Hit points66,300 HP(22/49) Rudder shift15.7 s(29/49) Main battery caliber406 mm(17/49) Main battery range17 km(29/49) Main battery reload27 s(33/49) Sigma1.8(29/49) HE shell damage5,700(24/48) HE fire chance36%(23/48) Fires per minute7.2(23/48) HE DPM114,000(17/48) AP DPM262,000(19/49) Main dispersion230 m(27/49) Secondary DPM (per side)180,000(35/49) Secondary HE alpha1,800(31/46) AP arming threshold68 mm(35/49) Turn-speed retention183.1 hp/m(25/49) Displacement47,006 t(24/49) AP pen at 10 km574 mm(25/49) Effective HE DPM (incl. fire)167,408(19/48) AA range5 km(19/49) Repair charges3(23/49) NormSecondary sigma1(48 of 49 tied at this value) NormAP fuse timer0.03 s(40 of 49 tied at this value) NormAP ricochet start45°(47 of 49 tied at this value) NormAP auto-bounce angle60°(46 of 49 tied at this value) NormRepair heal rate0.5 %/s(35 of 49 tied at this value) NormBow armor32 mm(36 of 48 tied at this value) NormStern armor32 mm(35 of 48 tied at this value)

Peers in this cohort

Compare Tier VII Battleships

Show all 49 peers

Stats & specs

Customize in the Build Tool →

Survivability

Hit Points66,300

Displacement47,006 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.

207.3 x 33 m (same hull as massachusetts)

Armor range6–439 mm

Plate armor thicknesses6, 16, 19, 22, 25, 32, 38, 50, 60, 76, 102, 121, 154, 156, 157, 168, 184, 274, 287, 305, 310, 343, 406, 439 mm

Armor material/layer entries58

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.

36.6%

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 (11,934 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 (13,260 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.

46%

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.

33,200

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.

19,900

Effective HP

Base 66,300 HP plus everything Repair Party can restore: 0.5%/s x 28 s = 9,282 HP per charge, x3 charges = 27,846 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.

94,146

Repairable: penetration50%

Repairable: citadel10%

Repairable: steering gear50%

Main Battery

ModuleArtillery: 406 mm Mk6

Mounts / barrels3 mounts / 9 barrels

Reload time30 s

Firing range17 km

Turret traverse4 °/s

Turret armor457 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.

±150°, ±146°, ±144°

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.

34° off bow / 36° off stern

See the firing-arcs diagram ↓

AP pen max range481 mm

HE fire DPM vs T7 BB48067

Effective HE DPM vs T7 BB150667

Shell Grouping (σ)1.8

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{17000}{30} \cdot \frac{12 - 2}{1000} + 2) \cdot 30 = 230 m

230 m at 17 km

Max Vert Disp

Vertical dispersion ellipse height at max range:

σ_{V} = σ_{H} \cdot radiusOnMax

= 230 \cdot 0.6 = 138 m

138 m at 17 km

Med Horiz Disp

50%-hit horizontal radius:

σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}

= 230 \cdot \frac{0.6}{1.8} = 76.7 m

76.7 m at 17 km

Med Vert Disp

50%-hit vertical radius:

σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}

= 138 \cdot \frac{0.6}{1.8} = 46 m

46 m at 17 km

Turret turn time

180 degrees / 4 deg/s traverse speed = 45 s.

45 s

Shells/min

Zero upgrades: 9 broadside guns x 60 / 30 s base reload = 18. All upgrades (Main Battery Mod. 3 = -10% reload): 9 broadside guns x 60 / 27 s all-upgrades reload = 20.

Initial: 18 → 20

HE shells

HE Damage5,700

HE Velocity803 m/s

Fire Chance36%

HE penetration

68 mm ≈ 406 mm caliber / 6 (standard HE penetration ratio).

68 mm

HE full-salvo alpha

5,700 HE damage x 9 broadside guns = 51,300.

51,300

HE DPM

Zero upgrades: 51,300 HE full-salvo alpha x 60 / 30 s base reload = 102,600. All upgrades (Main Battery Mod. 3 = -10% reload): 51,300 HE full-salvo alpha x 60 / 27 s all-upgrades reload = 114,000.

Initial: 102,600 → 114,000

Fires/min

Zero upgrades: 18 shells/min x 36% fire chance = 6.48. All upgrades (Main Battery Mod. 3 = -10% reload): 20 shells/min x 36% fire chance = 7.2.

Initial: 6.48 → 7.2

AP shells

AP Damage13,100

AP Velocity701 m/s

Min Ricochet45 deg

Guaranteed Ricochet60 deg

Fuse Timer0.033 s

Fuse Threshold68 mm

AP overmatch

floor(406 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 2598 \cdot 1225^{0.69} \cdot {0.406}^{- 1.07} \cdot 701^{1.38} = 778.8 mm

. Matches the in-game spec card.

778.8 mm point-blank

AP Pen Far

Same formula at the ship's max firing range (17 km), where the shell has slowed to 494.1 m/s:

P = 10^{- 7} \cdot 2598 \cdot 1225^{0.69} \cdot {0.406}^{- 1.07} \cdot {494.1}^{1.38} = 480.6 mm

480.6 mm at 17 km

AP full-salvo alpha

13,100 AP damage x 9 broadside guns = 117,900.

117,900

AP DPM

Zero upgrades: 117,900 AP full-salvo alpha x 60 / 30 s base reload = 235,800. All upgrades (Main Battery Mod. 3 = -10% reload): 117,900 AP full-salvo alpha x 60 / 27 s all-upgrades reload = 262,000.

Initial: 235,800 → 262,000

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.

150

AA Defense

AA mount points45

Maximum AA range

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 3.5 km; dual-purpose mount auras extend it.

5 km

40 mm Bofors Mk215×4 40mm

20 mm Oerlikon Mk425×1 20mm

20 mm Oerlikon Mk205×2 20mm

127 mm Mk32 (DP)

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

10×2 127mm

Guns127 mm Mk32 (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 131 from dual-purpose secondaries firing as AA in this range band.

131

Range5 km

Guns40 mm Bofors Mk2

Continuous DPS

Effective DPS: 112 raw aura damage × 3.5 × 0.75 hit probability = 294 - the same in-game units as the Close-range AA DPS headline.

294

Range3.5 km

Total DPS in Aura

Far 131 + Medium 294 = 425

425

Guns20 mm Oerlikon Mk20 + 20 mm Oerlikon Mk4

Continuous DPS

Effective DPS: 68 raw aura damage × 3.5 × 0.7 hit probability = 167 - the same in-game units as the Close-range AA DPS headline.

167

Range2 km

Total DPS in Aura

Far 131 + Medium 294 + Near 167 = 592

592

Bursts

Each ~2 s wave fires 2 quick salvos of 4 clouds ahead of the attacking squadron, plus 2 stray clouds farther out that appear off-beat between waves - up to 10 clouds per wave × 230 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 × 4 clouds + 2 outer

Cloud damage

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

230

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

Mounts10

Firing range7.0 km

Shell Grouping (σ)1

127 mm Mk32 (DP)

Dual-purpose: the same mounts also fire at aircraft, so they appear on the AA Defense card too - shared guns, not extra hardware.

10×2 127mm

Caliber127 mm

Reload time6 s

HE Damage1,800

Muzzle Velocity792 m/s

Fire Chance5%

Armor Pen21 mm

Secondary dispersion type

Max dispersion = range (km) × 27 + 30. Each dispersion type sets its own slope; this is not a percentage applied to a standard baseline.

Improved (50%, Massachusetts type)

Max secondary dispersion @ 7 km

7 km × 27 + 30 = 219 m.

219 m

Maneuverability

Engine power130,000 hp

Maximum speed27.5 kt

Turning circle radius710 m

Rudder shift time15.7 s

Engine power-boost threshold7 kt

Engine spool-up time23 s

Reverse spool-up time11.5 s

Reverse speed

top speed / 4 + 4.9 = 27.5 / 4 + 4.9 = 11.8 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.

11.8 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.

41.3 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).

9.6 kt

Acceleration 0-90%

Time to reach 90% of top speed (24.8 kt of 27.5 kt), from our in-house acceleration model.

34.8 s

Acceleration 0-99%

Time to reach 99% of top speed (27.2 kt of 27.5 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.

55.8 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{27.5 \cdot 0.5144}{710} = 1.14 ° / s

, so

ratio = \frac{ω_{turret}}{ω_{hull}} = \frac{4}{1.14} = 3.5 \times

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

3.5× drags

See the full acceleration curve ↓

Concealment

Detectability by sea15.47 km

Detectability by air12.38 km

Smoke firing penalty14.92 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.

17 km

Detect when firing (air)

Air detectability plus the gun-firing bloom (8.12 km, which tracks main-battery caliber x 0.020). Matches the in-game 'Detect Firing Air' value on every captured ship.

20.5 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.

17.47 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.

15.38 km

Guaranteed Detect2 km

✦

Consumables

Damage Control Party∞ charges · 80 s reload · 20 s active

Repair Party3 charges · 80 s reload · 28 s active · 9,282 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.
· 27,846 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.
· 332 HP/s (0.5% of max HP) heal per second
ƒ
0.5% of max HP (66,300 HP) per second = 332 HP/s. WoWS heals a flat percent of MAX HP each second, so this rate holds at any health level.

Choose one

Catapult Fighter4 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 Seaplane4 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

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)1.8

Max Horiz Disp230 m at 17 km

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:  $σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30$   $= (\frac{17000}{30} \cdot \frac{12 - 2}{1000} + 2) \cdot 30 = 230 m$

Shell scatter width @ 5 km110 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 km160 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 km210 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 Disp138 m at 17 km

Vertical dispersion ellipse height at max range: $σ_{V} = σ_{H} \cdot radiusOnMax$ $= 230 \cdot 0.6 = 138 m$

Shell scatter height @ 10 km82.8 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,  $radiusOnDelim = 0.5$  at  $delim \cdot R_{m a x} = 0.5 \cdot 17000 = 8500$  m, and  $radiusOnMax = 0.6$  at 17000 m. Above the kink:  $k = 0.5 + (0.6 - 0.5) \cdot \frac{10000 - 8500}{17000 - 8500} = 0.5176$ , so  $σ_{V} = σ_{H} \cdot k = 160 \cdot 0.5176 = 82.8 m$ .

Med Horiz Disp76.7 m at 17 km

50%-hit horizontal radius: $σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}$ $= 230 \cdot \frac{0.6}{1.8} = 76.7 m$

Med Vert Disp46 m at 17 km

50%-hit vertical radius: $σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}$ $= 138 \cdot \frac{0.6}{1.8} = 46 m$

AP Pen Close778.8 mm point-blank

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}$   $= 10^{- 7} \cdot 2598 \cdot 1225^{0.69} \cdot {0.406}^{- 1.07} \cdot 701^{1.38} = 778.8 mm$ . Matches the in-game spec card.

AP Pen Far480.6 mm at 17 km

Same formula at the ship's max firing range (17 km), where the shell has slowed to 494.1 m/s:  $P = 10^{- 7} \cdot 2598 \cdot 1225^{0.69} \cdot {0.406}^{- 1.07} \cdot {494.1}^{1.38} = 480.6 mm$ .

AP pen 5 km666 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 km574 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 km503 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.

AP flight time @ 10 km5.81 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:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.352 \cdot {0.406}^{2}}{8 \cdot 1225} = 1.86 \times 10^{- 5}$ . That runs from a 701 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 flight time @ 10 km5.3 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:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.3452 \cdot {0.406}^{2}}{8 \cdot 862} = 2.59 \times 10^{- 5}$ . That runs from a 803 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 ≈ 406 mm caliber / 6 (standard HE penetration ratio).

AP overmatch28 mm

floor(406 mm caliber / 14.3) = 28 mm (AP auto-penetrates plating this thick or less).

AP AOE Radius150

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 alpha9

All 9 barrels bear on the broadside.

Turret turn time45 s

180 degrees / 4 deg/s traverse speed = 45 s.

HE full-salvo alpha51,300

5,700 HE damage x 9 broadside guns = 51,300.

AP full-salvo alpha117,900

13,100 AP damage x 9 broadside guns = 117,900.

HE DPMInitial: 102,600 → 114,000

Zero upgrades: 51,300 HE full-salvo alpha x 60 / 30 s base reload = 102,600. All upgrades (Main Battery Mod. 3 = -10% reload): 51,300 HE full-salvo alpha x 60 / 27 s all-upgrades reload = 114,000.

AP DPMInitial: 235,800 → 262,000

Zero upgrades: 117,900 AP full-salvo alpha x 60 / 30 s base reload = 235,800. All upgrades (Main Battery Mod. 3 = -10% reload): 117,900 AP full-salvo alpha x 60 / 27 s all-upgrades reload = 262,000.

Shells/minInitial: 18 → 20

Zero upgrades: 9 broadside guns x 60 / 30 s base reload = 18. All upgrades (Main Battery Mod. 3 = -10% reload): 9 broadside guns x 60 / 27 s all-upgrades reload = 20.

Fires/minInitial: 6.48 → 7.2

Zero upgrades: 18 shells/min x 36% fire chance = 6.48. All upgrades (Main Battery Mod. 3 = -10% reload): 20 shells/min x 36% fire chance = 7.2.

AA defense

AA DPS at max range131

Only families that reach 5 km contribute at the outer edge of the AA bubble. In-game families: 40mm Bofors 15x4 -> 294 DPS @ 3.5 km; 20mm Oerlikon MK4 25x1 -> 139 DPS @ 2 km; 20mm Oerlikon MK20 Twin12 5x2 -> 28 DPS @ 2 km; 5in38 Mk32 Mod12 10x2 -> 131 DPS @ 5 km.

Maximum AA range5 km

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 3.5 km; dual-purpose mount auras extend it.

AA DPS layered by range131 DPS @ 5 km, 425 DPS @ 3.5 km, 592 DPS @ 2 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-blank592

Sum of every family's average DPS, achievable only inside the closest-range family (2 km).

AA threat index2018

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 range2 km

Secondary battery dispersion

Secondary dispersion typeImproved (50%, Massachusetts type)

Max dispersion = range (km) × 27 + 30. Each dispersion type sets its own slope; this is not a percentage applied to a standard baseline.

Max secondary dispersion @ 7 km219 m

7 km × 27 + 30 = 219 m.

Secondary dispersion @ 5 km165 m

Same per-type line evaluated at a fixed 5 km: 5 km × 27 + 30 = 165 m.

Secondary battery firepower

Secondary DPM (per side)180,000

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: 10×2 127 mm (10/side) × 60/6 × 1800 = 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 alpha1800

Maximum HE damage per shell across secondary HE families. Best on this ship: 1800 from the 127 mm family.

Max HE fire chance5%

Maximum per-shell fire chance across secondary HE families (before target fire resistance is applied). Best on this ship: 5% from the 127 mm family.

Max HE pen21 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: 21 mm from the 127 mm family.

Armor Beta

Hull HP 66,300, distributed across 5 hull zones, each with its own plate thicknesses, saturation cap, and pen thresholds. HP caps are estimated from the standard WoWs damage-allocation model.

Bow & stern32 mm

Overmatched by AP from only MusashiARP Musashi. Angled, everything else bounces.

Belt / citadel310 mm

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

Farming19 mm

Superstructure and extremities take HE pens and AP overpens from nearly any gun: steady chip damage. Fire resistance 37%, fires burn 60s. Range-by-range in the Compare tool →

Section	Plates	HP cap	Threats	Tactic
Bow	32 mm primary (range 32–50 mm)	≈ 3,315 (~5% of HP)	Overmatched by 460mm+ AP (Aki, Musashi)Angle bounces 410mm32 mm: HE pens from 203mm+	Bow-tank fits behind this exterior plate. Saturation is FAST here; the cap is often only a few thousand HP.
Hull (midship)	32 mm primary (range 6–439 mm)	≈ 49,725 (~75% of HP)	Overmatched by 460mm+ AP (Aki, Musashi)Angle bounces 410mm32 mm: HE pens from 203mm+	Largest HP pool. Citadel sits behind these plates; thinner deck and side plating absorb the rest.
Stern	32 mm primary (range 32–343 mm)	≈ 3,315 (~5% of HP)	Overmatched by 460mm+ AP (Aki, Musashi)Angle bounces 410mm32 mm: HE pens from 203mm+	Mirror of bow. Same fast saturation.
Citadel	310 mm primary (range 38–274 mm)	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	19 mm	no cap	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).

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

Exteriors

Skins & permanent camouflages

Every custom exterior Massachusetts 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.

2021-11-12 · Official ship feature / stats Black Friday Deals Variant source 2021-11-04 · Patch notes November update: Fury on the wings of wisdom Patch notes 2025-09-04 · Patch notes September Update: The Valor Armada Patch notes

Massachusetts B

Massachusetts B Community Stats

Massachusetts B Community Stats

Playstyle

Overview

Positioning

Potato Avoidance

Signature Traits →

How to get Massachusetts B

Best listed chance for this ship

Builds

Cohort position

Peers in this cohort

Stats & specs

See all derived stats

Main battery formulas

AA defense

Secondary battery dispersion

Secondary battery firepower

Armor Beta

Ship Charts

Skins & permanent camouflages

Primary official WG sources

Signature Traits