Main battery formulas
Shell Grouping (σ)2.4
Max Horiz Disp200.3 m at 17.1 km
Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:
Shell scatter width @ 5 km92.5 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 km137 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 km181.5 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 Disp120.2 m at 17.1 km
Vertical dispersion ellipse height at max range:
Shell scatter height @ 10 km70.8 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: at 0 m, at m, and at 17115 m. Above the kink: , so .
Med Horiz Disp50.1 m at 17.1 km
50%-hit horizontal radius:
Med Vert Disp30 m at 17.1 km
50%-hit vertical radius:
AP Pen Close859.5 mm point-blank
Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: . Matches the in-game spec card.
AP Pen Far467.8 mm at 17.1 km
Same formula at the ship's max firing range (17.1 km), where the shell has slowed to 611.3 m/s: .
AP pen 5 km713 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 km594 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 km501 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.
AP flight time @ 10 km4.37 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 950 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 km4.41 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 950 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 Radius225
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 alpha40,500
4,500 HE damage x 9 broadside guns = 40,500.
AP full-salvo alpha79,200
8,800 AP damage x 9 broadside guns = 79,200.
HE DPMInitial: 121,500 → 135,000
Zero upgrades: 40,500 HE full-salvo alpha x 60 / 20 s base reload = 121,500. All upgrades (Main Battery Mod. 3 = -10% reload): 40,500 HE full-salvo alpha x 60 / 18 s all-upgrades reload = 135,000.
AP DPMInitial: 237,600 → 264,000
Zero upgrades: 79,200 AP full-salvo alpha x 60 / 20 s base reload = 237,600. All upgrades (Main Battery Mod. 3 = -10% reload): 79,200 AP full-salvo alpha x 60 / 18 s all-upgrades reload = 264,000.
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: 8.91 → 9.9
Zero upgrades: 27 shells/min x 33% fire chance = 8.91. All upgrades (Main Battery Mod. 3 = -10% reload): 30 shells/min x 33% fire chance = 9.9.
Damage Control Party
Surveillance Radar
Defensive AA Fire
Repair Party