Main battery formulas
Shell Grouping (σ)2.05
Max Horiz Disp183.7 m at 16.1 km
Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:
Shell scatter width @ 5 km90 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 km132 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 km174 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 Disp110.2 m at 16.1 km
Vertical dispersion ellipse height at max range:
Shell scatter height @ 10 km69.1 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: at 0 m, at m, and at 16150 m. Above the kink: , so .
Med Horiz Disp53.8 m at 16.1 km
50%-hit horizontal radius:
Med Vert Disp32.3 m at 16.1 km
50%-hit vertical radius:
AP Pen Close622.2 mm point-blank
Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: . Matches the in-game spec card.
AP Pen Far343.4 mm at 16.1 km
Same formula at the ship's max firing range (16.1 km), where the shell has slowed to 495.4 m/s: .
AP pen 5 km510 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 . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.
AP pen 10 km421 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 . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.
AP pen 15 km356 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 . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.
HE flight time @ 10 km5.31 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, , where is air density from a standard-atmosphere profile and bundles the shell's drag coefficient, caliber and mass: . That runs from a 808 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 km5.51 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, , where is air density from a standard-atmosphere profile and bundles the shell's drag coefficient, caliber and mass: . That runs from a 762 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 penetration51 mm
51 mm ≈ 305 mm caliber / 6 (standard HE penetration ratio).
AP overmatch21 mm
floor(305 mm caliber / 14.3) = 21 mm (AP auto-penetrates plating this thick or less).
AP AOE Radius125
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 time30 s
180 degrees / 6 deg/s traverse speed = 30 s.
HE full-salvo alpha38,700
4,300 HE damage x 9 broadside guns = 38,700.
AP full-salvo alpha80,100
8,900 AP damage x 9 broadside guns = 80,100.
HE DPMInitial: 116,100 → 129,000
Zero upgrades: 38,700 HE full-salvo alpha x 60 / 20 s base reload = 116,100. All upgrades (Main Battery Mod. 3 = -10% reload): 38,700 HE full-salvo alpha x 60 / 18 s all-upgrades reload = 129,000.
AP DPMInitial: 240,300 → 267,000
Zero upgrades: 80,100 AP full-salvo alpha x 60 / 20 s base reload = 240,300. All upgrades (Main Battery Mod. 3 = -10% reload): 80,100 AP full-salvo alpha x 60 / 18 s all-upgrades reload = 267,000.
Shells/minInitial: 27 → 30
Zero upgrades: 9 broadside guns x 60 / 20 s base reload = 27. All upgrades (Main Battery Mod. 3 = -10% reload): 9 broadside guns x 60 / 18 s all-upgrades reload = 30.
Fires/minInitial: 7.29 → 8.1
Zero upgrades: 27 shells/min x 27% fire chance = 7.29. All upgrades (Main Battery Mod. 3 = -10% reload): 30 shells/min x 27% fire chance = 8.1.
Damage Control Party
Sonar
Defensive AA Fire
Surveillance Radar
Catapult Fighter
Repair Party