Main battery formulas
Shell Grouping (σ)1.8
Shell grouping (sigma); shown in-game as Shell Grouping.
Max Horiz Disp237 m
Horizontal dispersion ellipse width at max range. (R/30·(idealRadius−minRadius)/idealDistance + minRadius)·30 = (17450/30·(12−2.2)/1000 + 2.2)·30 = 237 m
Max Vert Disp142.2 m
Vertical dispersion ellipse height at max range = max horizontal × radiusOnMax = 237 × 0.6 = 142.2 m
Med Horiz Disp81.5 m
50%-hit horizontal radius = max horizontal × GetHalfHitsRatio(σ) = 237 × 0.344 (σ=1.8) = 81.5 m
Med Vert Disp48.9 m
50%-hit vertical radius = max vertical × GetHalfHitsRatio(σ) = 142.2 × 0.344 (σ=1.8) = 48.9 m
AP Pen Close761.8 mm
Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: 1e-7 × Krupp × mass^0.69 × caliber_m^-1.07 × v0^1.38 = 1e-7 × 2347 × 885^0.69 × 0.38^-1.07 × 830^1.38 = 761.8 mm. Matches the in-game spec card.
AP Pen Far424.6 mm
Same formula at the ship's max firing range (21.8 km), where the shell has slowed to 543.4 m/s: 1e-7 × 2347 × 885^0.69 × 0.38^-1.07 × 543.4^1.38 = 424.6 mm.
HE penetration63 mm
63 mm ≈ 380 mm caliber / 6 (standard HE penetration ratio).
AP overmatch26 mm
floor(380 mm caliber / 14.3) = 26 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 alpha9
All 9 barrels bear on the broadside.
Turret turn time36 s
180 degrees / 5 deg/s traverse speed = 36 s.
HE full-salvo alpha48,600
5,400 HE damage x 9 broadside guns = 48,600.
AP full-salvo alpha107,100
11,900 AP damage x 9 broadside guns = 107,100.
Base HE DPM95,607
48,600 HE full-salvo alpha x 60 / 30.5 s base reload = 95,607.
Base AP DPM210,689
107,100 AP full-salvo alpha x 60 / 30.5 s base reload = 210,689.
Installed HE DPM106,423
48,600 HE full-salvo alpha x 60 / 27.4 s installed reload (Main Battery Mod. 3 = -10%) = 106,423.
Installed AP DPM234,526
107,100 AP full-salvo alpha x 60 / 27.4 s installed reload (Main Battery Mod. 3 = -10%) = 234,526.
Base shells/min17.7
9 broadside guns x 60 / 30.5 s base reload = 17.7.
Installed shells/min19.7
9 broadside guns x 60 / 27.4 s installed Artillery reload = 19.7.
Base fires/min6.37
9 HE shells x 60 / 30.5 s reload x 36% fire chance = 6.37.
Installed fires/min7.09
9 HE shells x 60 / 27.4 s installed reload x 36% fire chance = 7.09.
AA defense
Close-range AA DPS351
Sum across every AA aura on this ship of (aura.continuous_damage x 3.5 x aura.hit_probability). Here: (33×3.5×0.75) + (22×3.5×0.7) + (80×3.5×0.75) = 351. Covers AA-only mounts plus dual-purpose secondaries (Bismarck 105mm, USN 5"/38 cruiser secondaries) and dual-purpose main batteries (Sumner-class 5"/38, Akizuki-line 100mm). Formula validated against in-game captures on California, Sumner, Manfred von Richthofen, Dante Alighieri (exact) and within +/-17% on the remaining verified ships.
Maximum AA range5 km
Longest-reaching aura across AA-only + dual-purpose auras.
AA threat index1461
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 firepower
Secondary DPM (per side)441,500
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: 14×2 100 mm (14/side) × 60/3 × 1400 = 392,000 + 3×3 152 mm (4.5/side) × 60/12 × 2200 = 49,500. 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.
Damage Control Party
Repair Party
Secondary Battery Booster
Engine Boost
