Main battery formulas
Shell Grouping (σ)2.2
Max Horiz Disp207 m
Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:
Shell scatter width @ 5 km120 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 km156 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 km192 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 Disp165.6 m
Vertical dispersion ellipse height at max range:
Shell scatter height @ 10 km98.9 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 17090 m. Above the kink: , so .
Med Horiz Disp56.5 m
50%-hit horizontal radius:
Med Vert Disp45.2 m
50%-hit vertical radius:
AP Pen Close884.5 mm
Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: . Matches the in-game spec card.
AP Pen Far391.8 mm
Same formula at the ship's max firing range (21.4 km), where the shell has slowed to 482.2 m/s: .
AP pen 5 km722 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 km576 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 km469 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 km4.88 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 870 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 km4.88 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 870 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 penetration82 mm
In-game data: 82 mm = 410 mm caliber / 5 (non-standard HE penetration ratio).
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) - 0.2 in this case. Lets HE pen ~102mm armor instead of ~68mm. Hits every German cruiser (150mm CL, 203mm CA) and BB (350mm+), British heavy cruisers / Lion / Nelson, a handful of other premiums.
AP overmatch28 mm
floor(410 mm caliber / 14.3) = 28 mm (AP auto-penetrates plating this thick or less).
AP AOE Radius250
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 time45 s
180 degrees / 4 deg/s traverse speed = 45 s.
HE full-salvo alpha70,000
7,000 HE damage x 10 broadside guns = 70,000.
AP full-salvo alpha137,000
13,700 AP damage x 10 broadside guns = 137,000.
HE DPMInitial: 150,000 → 166,667
Zero upgrades: 70,000 HE full-salvo alpha x 60 / 28 s base reload = 150,000. All upgrades (Main Battery Mod. 3 = -10% reload): 70,000 HE full-salvo alpha x 60 / 25.2 s all-upgrades reload = 166,667.
AP DPMInitial: 293,571 → 326,190
Zero upgrades: 137,000 AP full-salvo alpha x 60 / 28 s base reload = 293,571. All upgrades (Main Battery Mod. 3 = -10% reload): 137,000 AP full-salvo alpha x 60 / 25.2 s all-upgrades reload = 326,190.
Shells/minInitial: 21.4 → 23.8
Zero upgrades: 10 broadside guns x 60 / 28 s base reload = 21.4. All upgrades (Main Battery Mod. 3 = -10% reload): 10 broadside guns x 60 / 25.2 s all-upgrades reload = 23.8.
Fires/minInitial: 8.57 → 9.52
Zero upgrades: 21.4 shells/min x 40% fire chance = 8.57. All upgrades (Main Battery Mod. 3 = -10% reload): 23.8 shells/min x 40% fire chance = 9.52.
Damage Control Party
Repair Party
Engine Boost
Secondary Battery Booster
Defensive AA Fire