Main battery formulas
Shell Grouping (σ)2
Max Horiz Disp96 m at 10.8 km
Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:
Shell scatter width @ 5 km52.5 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 km90 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 Disp57.6 m at 10.8 km
Vertical dispersion ellipse height at max range:
Shell scatter height @ 10 km52.7 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 10796 m. Above the kink: , so .
Med Horiz Disp28.8 m at 10.8 km
50%-hit horizontal radius:
Med Vert Disp17.3 m at 10.8 km
50%-hit vertical radius:
AP Pen Close162.1 mm point-blank
Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: . Matches the in-game spec card.
AP Pen Far44.3 mm at 10.8 km
Same formula at the ship's max firing range (10.8 km), where the shell has slowed to 343.5 m/s: .
AP pen 5 km86 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 km48 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.
HE flight time @ 10 km6.71 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 880 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 km6.71 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 880 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 penetration32 mm
32 mm ≈ 128 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) - 0.25 in this case. Lets HE pen ~32mm armor instead of ~21mm. Hits every German cruiser (150mm CL, 203mm CA) and BB (350mm+), British heavy cruisers / Lion / Nelson, a handful of other premiums.
AP overmatch8 mm
floor(128 mm caliber / 14.3) = 8 mm (AP auto-penetrates plating this thick or less).
AP AOE Radius10
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 alpha5
All 5 barrels bear on the broadside.
Turret turn time18 s
180 degrees / 10 deg/s traverse speed = 18 s.
HE full-salvo alpha7,250
1,450 HE damage x 5 broadside guns = 7,250.
AP full-salvo alpha14,750
2,950 AP damage x 5 broadside guns = 14,750.
HE DPMInitial: 108,750 → 120,833
Zero upgrades: 7,250 HE full-salvo alpha x 60 / 4 s base reload = 108,750. All upgrades (Main Battery Mod. 3 = -10% reload): 7,250 HE full-salvo alpha x 60 / 3.6 s all-upgrades reload = 120,833.
AP DPMInitial: 221,250 → 245,833
Zero upgrades: 14,750 AP full-salvo alpha x 60 / 4 s base reload = 221,250. All upgrades (Main Battery Mod. 3 = -10% reload): 14,750 AP full-salvo alpha x 60 / 3.6 s all-upgrades reload = 245,833.
Shells/minInitial: 75 → 83.3
Zero upgrades: 5 broadside guns x 60 / 4 s base reload = 75. All upgrades (Main Battery Mod. 3 = -10% reload): 5 broadside guns x 60 / 3.6 s all-upgrades reload = 83.3.
Fires/minInitial: 4.5 → 5
Zero upgrades: 75 shells/min x 6% fire chance = 4.5. All upgrades (Main Battery Mod. 3 = -10% reload): 83.3 shells/min x 6% fire chance = 5.
Torpedoes
Torpedo detectability1.8 km
Estimated torpedo reaction time8.9 s
detectability / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement; the community's traditional 2.6 reads about 3% slower).
Torpedo speed75 kt
Travel time to max range39.7 s
range / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement).
Torpedo module damage1,200
Per-torpedo module/blast damage parameter from in-game data. Most torpedoes carry 500 to 2,000; ships announced by WG as dealing increased module damage carry 9,000 to 12,000, so their hits knock out engines, rudders, and turrets far more often. Comparative figure; the exact module-HP conversion is not published.
Tube count8
2 launchers x 4 tubes.
Per-side salvo8 torpedoes
8 (centerline launchers train across - full salvo to either side).
Full-salvo damage137,600
All tubes hitting one target: tubes x per-torpedo simulated damage = 8 x 17,200 = 137,600.
Per-side salvo damage137,600
One side firing, all torpedoes hitting: per-side tubes x per-torpedo simulated damage = 8 x 17,200 = 137,600.
Damage Control Party
Smoke Generator
Defensive AA Fire
Engine Boost
Main Battery Reload Booster
