GamingDiver / WoWs Legends Ships / Iron Duke

World of Warships: Legends ship guide

Iron Duke

Also called: 铁公爵 Beta

U.K. · Tier IV · Battleship · Tech Tree: Flamethrowing Battleships

Fire-starter battleshipImproved HE means fires and chip damage on anything angled; heal back the trade.

Playstyle

Anchor a flank at 12-15 km with bow toward the closest threat
Avoid: Taking the long way round the map edge to flank

Key characteristics

High HE / fire outputImproved HE penBurny secondariesLong-reach AAThick deck armorSlow AP shells

On this page

Community stats
Playstyle
How to get Iron Duke
Builds
Cohort position
Stats and specs
Armor
Charts
Exteriors

Community Data

Iron Duke Community Stats

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

Playstyle

Overview

Iron Duke is a Tier IV British fire-starter battleship: her improved-penetration HE farms fires and chips angled targets her AP cannot crack, so the kit is sustained HE pressure from range rather than bow-in trading. HE pen sits at the 1/4 caliber ratio instead of the standard 1/6, so HE spam is a real damage option here. Standout traits: best burny secondaries in T4 BBs (12) and best AA reach in T4 BBs (5 km).

Positioning

Anchor a flank at 12-15 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 22.5 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.

Potato Avoidance

Taking the long way round the map edge to flank

At 22.5 kn five minutes of sailing buys about 3.5 km, so a border run costs most of the mid-game and arrives after the fight it was meant to decide. She wins by holding a lane and trading from it: pick the flank before the first salvo, then let the guns do the travelling.

Signature Traits

Improved HE penetration

HE pen at the 1/4 caliber ratio instead of the standard 1/6. HE-spam is a real damage option here, not just a fire-starter, shared by 6/24 T4 BBs.

ELITE MAIN BATTERY ↗

High fire chance · 40%
High fire pressure · 8 fires

Burny secondaries ↗

12% best HE fire chance per secondary shell (before target resistance), best of T4 BBs. Stacks fires faster than peers in a brawl.

Long-reach AA ↗

5 km AA reach, best of T4 BBs.

Slow AP shells ↗

759 m/s AP muzzle velocity, bottom decile of T4 BBs. Lobby trajectory, more lead, easier to dodge at range.

Light citadel belt ↗

38 mm citadel belt, bottom decile of T4 BBs. Citadels through angle are possible.

Acquisition

How to get Iron Duke

Iron Duke is available in the Flamethrowing Battleships branch of the U.K. Tech Tree for 500,000 credits after researching it in the branch. Known module upgrades cost up to 125,000 credits.

Show U.K. tech-tree branch diagram

U.K. Tech Tree

Iron Duke sits in the Flamethrowing Battleships branch. The highlighted path shows the local branch context inside the full U.K. tree.

7 ships in highlighted branch · scroll to inspect all U.K. lines.

U.K.IIIIIIIVVVIVIIVIII★

Destroyer

Cruiser

Cruiser Split

Battleship

Battleship Split

Carrier

Tier VRenownPBSB547 Tier VIIVanguardPBSB508 Tier VIIIDrakePBSC209 Tier VIIIDuncanPBSB209 Tier VIIAlbemarlePBSC208 Tier VIIHawkePBSB208 Tier VISurreyPBSC207 Tier VIRookePBSB207 Tier VDevonshirePBSC206 Tier IVHawkinsPBSC205 Tier IVTigerPBSB205 Tier IIIHermesPBSA204 Tier VIIITemerairePBSB112 Tier ★DaringPBSD110 Tier ★MinotaurPBSC110 Tier ★ConquerorPBSB110 Tier VIIIJutlandPBSD109 Tier VIIINeptunePBSC109 Tier VIILightningPBSD108 Tier VIIEdinburghPBSC108 Tier VIIImplacablePBSA108 Tier VIJervisPBSD107 Tier VIFijiPBSC107 Tier VIKing George VPBSB107 Tier VIcarusPBSD106 Tier VLeanderPBSC106 Tier VQueen ElizabethPBSB106 Tier VFuriousPBSA106 Tier IVAcastaPBSD105 Tier IVEmeraldPBSC105 Tier IVIron DukePBSB105 Tier IIIWakefulPBSD104 Tier IIIDanaePBSC104 Tier IIIOrionPBSB104 Tier IIValkyriePBSD103 Tier IICaledonPBSC103 Tier IWeymouthPBSC102

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 Hood AL Nelson AL Queen Elizabeth

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

Cohort position

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Where Iron Duke sits among Tier IV BBs (23 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 bracket33 (1 of 4 tied) BestSecondary fire chance12% (1 of 3 tied) BestAA range5 km (1 of 5 tied) Top 10%Fires per minute8 (3/24) Top 25%HE DPM100,000 (6/24) Top 25%AP DPM198,000 (5/24) Top 25%Effective HE DPM (incl. fire)157,886 (4/24) Top 25%Secondary range4.5 km (7/24) Top 25%AA DPS212 (4/23) Top 25%AA threat616 (5/23) Top 25%Max armor305 mm (7/24) Top 25%Deck armor76 mm (4/24) Bottom 25%Acceleration38.6 s (22/24) Bottom 25%Power-to-weight1.05 hp/t (19/24) Bottom 10%HE velocity759 m/s (23/24) WorstTraverse-to-turn ratio2.45 × (24/24) WorstAP velocity759 m/s (24/24) WorstNo torpedoes (21 of 24 in cohort) WorstCitadel belt38 mm (24/24)

See 29 mid-pack stats

Not standouts for Iron Duke -- 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 points47,100 HP(15/24) Max speed22.5 kt(16/24) Concealment13.43 km(16/24) Smoke fire bloom11.29 km(17/24) Air detection10.74 km(16/24) Rudder shift13.3 s(12/24) Turning circle650 m(13/24) Main battery caliber343 mm(11/24) Main battery range14.88 km(11/24) Main battery reload30 s(13/24) Sigma1.8(11/24) HE shell damage5,000(11/24) AP shell damage9,900(10/24) Main dispersion208.8 m(16/24) Secondary DPM (per side)152,093(11/24) Secondary HE alpha2,200(7/23) Secondary HE pen25 mm(9/23) AP fuse timer0.01 s(16/24) AP arming threshold57 mm(13/24) Engine power32,500 hp(16/24) Turn-speed retention50 hp/m(18/24) Displacement30,867 t(9/24) AP pen at 10 km310 mm(15/24) Flak per wave (expected)240(6/16) Repair charges3(11/24) Bow armor19 mm(11/24) Stern armor19 mm(12/24) NormTurn speed retained81%(23 of 24 tied at this value) NormRepair heal rate0.5 %/s(20 of 24 tied at this value)

Peers in this cohort

Compare Tier IV Battleships

Show all 23 peers

Stats & specs

Customize in the Build Tool →

Survivability

Hit PointsInitial: 41,200 → 47,100

Displacement30,867 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.

189.8 x 27.4 m (published figure)

Armor range13–305 mm

Plate armor thicknesses13, 19, 25, 30, 38, 44, 63, 76, 102, 152, 203, 229, 254, 279, 305 mm

Armor material/layer entries68

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.

Initial: 13.3% → 16.6%

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 (8,478 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 (9,420 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.

16%

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.

23,600

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.

14,100

Effective HP

Base 47,100 HP plus everything Repair Party can restore: 0.5%/s x 28 s = 6,594 HP per charge, x3 charges = 19,782 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.

66,882

Repairable: penetration60%

Repairable: citadel10%

Repairable: steering gear50%

Main Battery

ModuleArtillery: 343 mm/45 Mk V

Mounts / barrels5 mounts / 10 barrels

Reload time30 s

Firing range (base)13.5 km

Firing range (top fire control)14.9 km

Turret traverse2.5 °/s

Turret armor279 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.

±149°, ±144°, 2x ±150°, ±148°

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.

36° off bow / 31° off stern

See the firing-arcs diagram ↓

HE fire DPM vs T4 BB57886

Effective HE DPM vs T4 BB157886

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{14878.6}{30} \cdot \frac{12 - 2}{1000} + 2) \cdot 30 = 208.8 m

208.8 m at 14.9 km

Max Vert Disp

Vertical dispersion ellipse height at max range:

σ_{V} = σ_{H} \cdot radiusOnMax

= 208.8 \cdot 0.6 = 125.3 m

125.3 m at 14.9 km

Med Horiz Disp

50%-hit horizontal radius:

σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}

= 208.8 \cdot \frac{0.6}{1.8} = 69.6 m

69.6 m at 14.9 km

Med Vert Disp

50%-hit vertical radius:

σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}

= 125.3 \cdot \frac{0.6}{1.8} = 41.8 m

41.8 m at 14.9 km

Turret turn time

180 degrees / 2.5 deg/s traverse speed = 72 s.

72 s

Shells/min

10 broadside guns x 60 / 30 s base reload = 20.

HE shells

HE Damage5,000

HE Velocity759 m/s

Fire Chance40%

HE penetration

86 mm ≈ 343 mm caliber / 4 (improved HE penetration: German BBs, Yamato-class, and a handful of others).

86 mm

HE full-salvo alpha

5,000 HE damage x 10 broadside guns = 50,000.

50,000

HE DPM

50,000 HE full-salvo alpha x 60 / 30 s base reload = 100,000.

100,000

Fires/min

20 shells/min x 40% fire chance = 8.

AP shells

AP Damage9,900

AP Velocity759 m/s

Min Ricochet45 deg

Guaranteed Ricochet60 deg

Fuse Timer0.015 s

Fuse Threshold57 mm

AP overmatch

floor(343 mm caliber / 14.3) = 23 mm (AP auto-penetrates plating this thick or less).

23 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 2031 \cdot 635^{0.69} \cdot {0.343}^{- 1.07} \cdot 759^{1.38} = 517.1 mm

. Matches the in-game spec card.

517.1 mm point-blank

AP Pen Far

Same formula at the ship's max firing range (14.9 km), where the shell has slowed to 450 m/s:

P = 10^{- 7} \cdot 2031 \cdot 635^{0.69} \cdot {0.343}^{- 1.07} \cdot 450^{1.38} = 251.4 mm

251.4 mm at 14.9 km

AP full-salvo alpha

9,900 AP damage x 10 broadside guns = 99,000.

99,000

AP DPM

99,000 AP full-salvo alpha x 60 / 30 s base reload = 198,000.

198,000

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.

AA Defense

AA mount pointsInitial: 8 → 10

Maximum AA range

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 2.5 km; dual-purpose mount auras extend it.

5 km

40 mm Vickers 2-pdr. Mk VII4×4 40mm

40 mm Vickers 2-pdr. Mk VIII (upgraded hull only)2×8 40mm

12.7 mm Mk III4×4 13mm

102 mm/45 QF Mk XIX (DP)

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

2×2 102mm

Guns102 mm/45 QF Mk XIX (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 42 from dual-purpose secondaries firing as AA in this range band.

Range5 km

Guns40 mm Vickers 2-pdr. Mk VII + 40 mm Vickers 2-pdr. Mk VIII

Continuous DPS

Effective DPS: 59 raw aura damage × 3.5 × 0.75 hit probability = 155 - the same in-game units as the Close-range AA DPS headline.

Initial: 105 → 155

Range2.5 km

Total DPS in Aura

Far 42 + Medium 155 = 197

197

Guns12.7 mm Mk III

Continuous DPS

Effective DPS: 6 raw aura damage × 3.5 × 0.7 hit probability = 15 - the same in-game units as the Close-range AA DPS headline.

Initial: 17 → 15

Range1.2 km

Total DPS in Aura

Far 42 + Medium 155 + Near 15 = 212

212

Bursts

Each ~2 s wave fires 2 quick salvos of 1 clouds ahead of the attacking squadron - up to 2 clouds per wave × 160 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 × 1 clouds

Cloud damage

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

160

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

Mounts14 → 16

Firing range4.5 km

Shell Grouping (σ)1

Secondary dispersion type

This ship's secondary families don't share one dispersion bracket. Each family is listed below with its own slope; max dispersion = secondary range (km) × that family's slope + 30 m.

Improved (40%) + Standard

Caliber102 mm

Reload time3 s

HE Damage1,500

Muzzle Velocity811 m/s

Fire Chance6%

Armor Pen17 mm

Show 1 more gun family

Caliber152 mm

Reload time8.6 s

HE Damage2,200

Muzzle Velocity914 m/s

Fire Chance12%

Armor Pen25 mm

Maneuverability

Engine power32,500 hp

Maximum speed22.5 kt

Turning circle radius650 m

Rudder shift time13.3 s

Engine power-boost threshold7 kt

Engine spool-up time23 s

Reverse spool-up time11.5 s

Reverse speed

top speed / 4 + 4.9 = 22.5 / 4 + 4.9 = 10.5 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.

10.5 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.

50.2 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).

7.4 kt

Acceleration 0-90%

Time to reach 90% of top speed (20.2 kt of 22.5 kt), from our in-house acceleration model.

38.6 s

Acceleration 0-99%

Time to reach 99% of top speed (22.3 kt of 22.5 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.

64.4 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{22.5 \cdot 0.5144}{650} = 1.02 ° / s

, so

ratio = \frac{ω_{turret}}{ω_{hull}} = \frac{2.5}{1.02} = 2.5 \times

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

2.5× drags

See the full acceleration curve ↓

Concealment

Detectability by sea13.43 km

Detectability by air10.74 km

Smoke firing penalty11.29 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.

14.88 km

Detect when firing (air)

Air detectability plus the gun-firing bloom (6.86 km, which tracks main-battery caliber x 0.020). Matches the in-game 'Detect Firing Air' value on every captured ship.

17.6 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.

15.43 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.

13.74 km

Guaranteed Detect2 km

✦

Consumables

Damage Control Party∞ charges · 80 s reload · 15 s active

Repair Party3 charges · 80 s reload · 28 s active · 6,594 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.
· 19,782 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.
· 236 HP/s (0.5% of max HP) heal per second
ƒ
0.5% of max HP (47,100 HP) per second = 236 HP/s. WoWS heals a flat percent of MAX HP each second, so this rate holds at any health level.

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

Module options (3)

Stats above use the fully-upgraded modules. These are the research-tree alternatives; trade-offs are flagged.

HullUpgrade

Hit points41,200 → 47,100
Rudder shift24.2 → 17.3 s
AA mounts8 → 10
Close-range AA DPS47 → 65

Fire controlUpgrade

Main battery range13,526 → 14878.6 m

EngineUpgrade

Time to 90% speed39.8 → 38.6 s

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 Disp208.8 m at 14.9 km

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:  $σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30$   $= (\frac{14878.6}{30} \cdot \frac{12 - 2}{1000} + 2) \cdot 30 = 208.8 m$

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.

Max Vert Disp125.3 m at 14.9 km

Vertical dispersion ellipse height at max range: $σ_{V} = σ_{H} \cdot radiusOnMax$ $= 208.8 \cdot 0.6 = 125.3 m$

Shell scatter height @ 10 km85.5 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  $delim \cdot R_{m a x} = 0.5 \cdot 14878.6 = 7439$  m, and  $radiusOnMax = 0.6$  at 14878.6 m. Above the kink:  $k = 0.5 + (0.6 - 0.5) \cdot \frac{10000 - 7439}{14878.6 - 7439} = 0.5344$ , so  $σ_{V} = σ_{H} \cdot k = 160 \cdot 0.5344 = 85.5 m$ .

Med Horiz Disp69.6 m at 14.9 km

50%-hit horizontal radius: $σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}$ $= 208.8 \cdot \frac{0.6}{1.8} = 69.6 m$

Med Vert Disp41.8 m at 14.9 km

50%-hit vertical radius: $σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}$ $= 125.3 \cdot \frac{0.6}{1.8} = 41.8 m$

AP Pen Close517.1 mm point-blank

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}$   $= 10^{- 7} \cdot 2031 \cdot 635^{0.69} \cdot {0.343}^{- 1.07} \cdot 759^{1.38} = 517.1 mm$ . Matches the in-game spec card.

AP Pen Far251.4 mm at 14.9 km

Same formula at the ship's max firing range (14.9 km), where the shell has slowed to 450 m/s:  $P = 10^{- 7} \cdot 2031 \cdot 635^{0.69} \cdot {0.343}^{- 1.07} \cdot 450^{1.38} = 251.4 mm$ .

AP pen 5 km398 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 km310 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 flight time @ 10 km5.8 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:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.4273 \cdot {0.343}^{2}}{8 \cdot 635} = 3.11 \times 10^{- 5}$ . That runs from a 759 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 km5.8 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:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.4273 \cdot {0.343}^{2}}{8 \cdot 635} = 3.11 \times 10^{- 5}$ . That runs from a 759 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 penetration86 mm

86 mm ≈ 343 mm caliber / 4 (improved HE penetration: German BBs, Yamato-class, and a handful of others).

Improved HE PenYes

This ship's HE shells use a 1/4 (~0.25) caliber-to-pen ratio instead of the standard 1/6 (~0.167) - 0.251 in this case. Lets HE pen ~85mm armor instead of ~57mm. Hits every German cruiser (150mm CL, 203mm CA) and BB (350mm+), British heavy cruisers / Lion / Nelson, a handful of other premiums.

AP overmatch23 mm

floor(343 mm caliber / 14.3) = 23 mm (AP auto-penetrates plating this thick or less).

AP AOE Radius55

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 alpha10

All 10 barrels bear on the broadside.

Turret turn time72 s

180 degrees / 2.5 deg/s traverse speed = 72 s.

HE full-salvo alpha50,000

5,000 HE damage x 10 broadside guns = 50,000.

AP full-salvo alpha99,000

9,900 AP damage x 10 broadside guns = 99,000.

HE DPM100,000

50,000 HE full-salvo alpha x 60 / 30 s base reload = 100,000.

AP DPM198,000

99,000 AP full-salvo alpha x 60 / 30 s base reload = 198,000.

Shells/min20

10 broadside guns x 60 / 30 s base reload = 20.

Fires/min8

20 shells/min x 40% fire chance = 8.

AA defense

AA DPS at max range42

Only families that reach 5 km contribute at the outer edge of the AA bubble. In-game families: 2 pdr MkVII Quad 4x4 -> 103 DPS @ 2.5 km; 2 pdr MkVIII 8barrel 2x8 -> 52 DPS @ 2.5 km; 12mm62 HI 4x4 -> 15 DPS @ 1.2 km; 4in45 QF Mk XIX 4x2 -> 42 DPS @ 5 km.

Maximum AA range5 km

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 2.5 km; dual-purpose mount auras extend it.

AA DPS layered by range42 DPS @ 5 km, 197 DPS @ 2.5 km, 212 DPS @ 1.2 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-blank212

Sum of every family's average DPS, achievable only inside the closest-range family (1.2 km).

AA threat index616

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 range1.2 km

Secondary battery dispersion

Secondary dispersion typeImproved (40%) + Standard

This ship's secondary families don't share one dispersion bracket. Each family is listed below with its own slope; max dispersion = secondary range (km) × that family's slope + 30 m.

102 mm × 4 dispersion typeStandard

Max dispersion = range (km) × 57 + 30 for this family. Slope is set per gun model.

102 mm × 4 max disp @ 4.5 km286.5 m

4.5 km × 57 + 30 = 286.5 m.

152 mm × 12 dispersion typeImproved (40%, German battlecruiser type)

Max dispersion = range (km) × 33 + 30 for this family. Slope is set per gun model.

152 mm × 12 max disp @ 4.5 km178.5 m

4.5 km × 33 + 30 = 178.5 m.

Secondary battery firepower

Secondary DPM (per side)152,093

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: 2×2 102 mm (2/side) × 60/3 × 1500 = 60,000 + 12×1 152 mm (6/side) × 60/8.6 × 2200 = 92,093. Assumes every shell hits (real hit rate is lower; the Brawl matchup tool on the Compare page folds in dispersion + target armor).

Max HE alpha2200

Maximum HE damage per shell across secondary HE families. Best on this ship: 2200 from the 152 mm family.

Max HE fire chance12%

Maximum per-shell fire chance across secondary HE families (before target fire resistance is applied). Best on this ship: 12% from the 152 mm family.

Max HE pen25 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: 25 mm from the 152 mm family.

Armor Beta

Hull HP 41,200 → 47,100 with hull upgrade, 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 & stern19 mm

Overmatched by 76+ 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.

Farming13 mm

Superstructure and extremities take HE pens and AP overpens from nearly any gun: steady chip damage. Fire resistance 17%, fires burn 60s. Range-by-range in the Compare tool →

Section	Plates	HP cap	Threats	Tactic
Bow	19 mm primary (range 19–152 mm)	2,600 (6% of HP)	Overmatched by 283mm+ AP (Nassau, Von Der Tann)Angle bounces 203mm19 mm: HE pens from 127mm+	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 19–305 mm)	35,300 (75% of HP)	Overmatched by 380mm+ AP (Bayern)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	19 mm primary (range 19–152 mm)	1,600 (3% of HP)	Overmatched by 283mm+ AP (Nassau, Von Der Tann)Angle bounces 203mm19 mm: HE pens from 127mm+	Mirror of bow. Same fast saturation.
Citadel	305 mm primary (range 19–38 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	13 mm primary (range 13–279 mm)	1,600 (3% of HP)	Any HE ≥16 mm pens at full damageDamage multiplier ×0.6	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	23,600 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 (152 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.
Engine (module, research)	engine coefficient (unconfirmed)	-0.067 research estimate	Largest on BB/BC; zero on destroyers	Engine durability isn't a per-ship value in the game data. This small negative coefficient is non-zero only on battleships, battlecruisers, and the heaviest cruisers, and is exactly zero on every destroyer, so it scales with hull displacement rather than any commander skill. Most likely an engine drag or power term in the same family as the deceleration stats; its exact meaning is not yet confirmed.
Rudder (module)	separate HP pool, does not drain ship HP	14,100 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.

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Every custom exterior Iron Duke can equip, from in-game data.

DefaultThe ship’s standard exterior

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GamingDiver has indexed official WG mentions for this ship, but none are focused enough to show as a primary source card here. Low-context list, crate, comparison, or passing mentions are intentionally filtered out.

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Iron Duke

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AA defense

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Armor Beta

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