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Rio de Janeiro is a Tier IV Pan-American AP-DPM battleship (219,484 AP DPM): her main battery throughput is top-decile, so the kit pays out by punishing every broadside she catches rather than waiting for a perfect alpha salvo. Keep the guns reloading on targets, not on cover. She also packs the super-heal (0.66%/s, for 28 s, every 80 s, 3 charges): each Repair Party charge returns dramatically more HP than a standard heal, so her durability comes from sustain alongside the lead trait. HE pen sits at the 1/4 caliber ratio instead of the standard 1/6, so HE spam is a real damage option here - pens roughly 1.5x more armor than a same-caliber peer's HE round. Standout traits: best HE DPM in T4 BBs (140,903) and best fires per minute in T4 BBs (8.7).
Hold 12-15 km on a flank with firing arcs into rotating cruisers and broadside BBs. The kit's value is salvo cycle count, so prioritize a position where the next reload always has a target; bow on between salvos and trade angles rather than holding broadside for a single shot.
The kit pays for itself when the guns are cycling on targets; a 20-second window between salvos because no broadside is available is the kit doing nothing. Pre-rotate turrets toward likely-broadside ships before you need the shot.
HE pen at the 1/4 caliber ratio instead of the standard 1/6. HE-spam is a real damage option here, not just a fire-starter; pens roughly 1.5x more armor than a same-caliber peer's HE, shared by 6/24 T4 BBs.
12.0% best HE fire chance per secondary shell (before target resistance), best of T4 BBs. Stacks fires faster than peers in a brawl.
211.8 m max horizontal dispersion, worst of T4 BBs. Long-range salvos are noticeably wider than peers'.
Rio de Janeiro is a Premium ship and not available to unlock in the Tech Tree. Acquisition path: Premium/Event.
Pair with a commander whose unique skill complements her main armament; check the build tool for current recommendations.
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Where Rio de Janeiro sits among Tier IV BBs (24 ships). Notable standouts are shown first; the rest of the cohort-ranked stats are in the expand below. Acquisition variants (Black Friday, Founders Edition) are counted once with their base ship, not as separate peers.
Not standouts for Rio de Janeiro -- here's where she sits on every other ranked stat in the cohort. Stats tagged NORM are tied across more than half the cohort, so the value is the cohort default rather than a standout.
Damage Control Party∞ charges · 40 s reload · 5 s active
Repair Party3 charges · 80 s reload · 28 s active · 8,944 HP (18.5% of max HP) total heal (per charge) 
Secondary Battery Booster3 charges · 160 s reload · 30 s active · +100% grouping · -50% dispersionAll values are ship base stats with modifications and upgrade changes denoted inline.
Numbers the spec table cannot show directly: alpha-strike math, DPM, dispersion, AP penetration. Click the formula chip on any row to reveal how it is calculated.
Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model: $\sigma_H = \left(\dfrac{R}{30}\cdot\dfrac{\text{idealRadius}-\text{minRadius}}{\text{idealDistance}} + \text{minRadius}\right)\cdot 30$ $= \left(\dfrac{14882}{30}\cdot\dfrac{12-2.2}{1000} + 2.2\right)\cdot 30 = 211.8\,\text{m}$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.Vertical dispersion ellipse height at max range: $\sigma_V = \sigma_H \cdot \text{radiusOnMax}$ $= 211.8 \cdot 0.6 = 127.1\,\text{m}$How tall the same scatter ellipse is at 10 km. Comparable from ship to ship for the same reason as the width value above.50%-hit horizontal radius: $\sigma_{H,50} = \sigma_H \cdot \text{GetHalfHitsRatio}(\sigma)$ $= 211.8 \cdot 0.356\;(\sigma = 1.7) = 75.5\,\text{m}$50%-hit vertical radius: $\sigma_{V,50} = \sigma_V \cdot \text{GetHalfHitsRatio}(\sigma)$ $= 127.1 \cdot 0.356\;(\sigma = 1.7) = 45.3\,\text{m}$Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity: $P = 10^{-7}\cdot K \cdot m^{0.69} \cdot d^{-1.07} \cdot v_0^{1.38}$ $= 10^{-7}\cdot 2187 \cdot 389.8^{0.69} \cdot 0.305^{-1.07} \cdot 831^{1.38} = 510.9\,\text{mm}$. Matches the in-game spec card.Same formula at the ship's max firing range (18.6 km), where the shell has slowed to 374.9 m/s: $P = 10^{-7}\cdot 2187 \cdot 389.8^{0.69} \cdot 0.305^{-1.07} \cdot 374.9^{1.38} = 170.3\,\text{mm}$.76 mm ≈ 305 mm caliber / 4 (improved HE penetration: German BBs, Yamato-class, and a handful of others).This ship's HE shells use a 1/4 (~0.25) caliber-to-pen ratio instead of the standard 1/6 (~0.167) - 0.249 in this case. Lets HE pen ~76mm armor instead of ~50mm. Hits every German cruiser (150mm CL, 203mm CA) and BB (350mm+), British heavy cruisers / Lion / Nelson, a handful of other premiums.floor(305 mm caliber / 14.3) = 21 mm (AP auto-penetrates plating this thick or less).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.All 14 barrels bear on the broadside.180 degrees / 3 deg/s traverse speed = 60 s.5,200 HE damage x 14 broadside guns = 72,800.8,100 AP damage x 14 broadside guns = 113,400.72,800 HE full-salvo alpha x 60 / 31 s base reload = 140,903.113,400 AP full-salvo alpha x 60 / 31 s base reload = 219,484.14 broadside guns x 60 / 31 s base reload = 27.1.27.1 shells/min x 32% fire chance = 8.67.Continuous AA damage summed across AirDefense module auras (no usable per-aura data available, so the formula prediction couldn't be applied on this ship).Longest-reaching aura across AA-only + dual-purpose auras.Max dispersion = range (km) × 57 + 30. Each dispersion type sets its own slope; this is not a percentage applied to a standard baseline.4 km × 57 + 30 = 258 m.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: 14×1 152 mm (7/side) × 60/5 × 2200 = 184,800 + 4×1 152 mm (2/side) × 60/5 × 2200 = 52,800 + 10×1 76.2 mm (5/side) × 60/4 × 1100 = 82,500. Assumes every shell hits (real hit rate is lower; the Brawl matchup tool on the Compare page folds in dispersion + target armor).Maximum HE damage per shell across secondary HE families. Best on this ship: 2200 from the 152 mm family.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.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.Hull HP 48,400, distributed across 5 hull zones, each with its own plate thicknesses, saturation cap, and pen thresholds. HP caps are the exact in-game values, not estimated.
Overmatched by 76+ guns across the bracket. Can’t reliably bow-tank; gets bow-citadelled and overpenned.
AP can citadel a flat broadside even at range. Stay angled and avoid showing the full side.
Superstructure and extremities take HE pens and AP overpens from nearly any gun: steady chip damage. Fire resistance 17%, fires burn 60s. Range-by-range in the ballistics tool →
| Section | Plates | HP cap | Threats | Tactic |
|---|---|---|---|---|
| Bow | 19 mm primary (range 19–229 mm) | 1,900 (4% of HP) | Overmatched by 283mm+ (Nassau, Von Der Tann)Angle bounces 203mm19 mm: HE pens from 127mm+ | Bow-tank fits behind this exterior plate. Saturation is FAST here; the cap is often only a few thousand HP. |
| Hull (midship) | 19 mm primary (range 19–229 mm) | 36,300 (75% of HP) | Overmatched by 283mm+ (Nassau, Von Der Tann)Angle bounces 203mm19 mm: HE pens from 127mm+ | Largest HP pool. Citadel sits behind these plates; thinner deck and side plating absorb the rest. |
| Stern | 30 mm primary (range 19–229 mm) | 1,600 (3% of HP) | Overmatch not possible in its bracketAngle bounces 410mm30 mm: HE pens from 203mm+ | Mirror of bow. Same fast saturation. |
| Citadel | 229 mm primary (range 25–229 mm) | ≈ 165,500 (effectively no cap) | Citadel pen: full damageOver-pen: ×0.10 damage | Effectively no cap; citadel pool sits at ~165k HP on every ship. An AP citadel penetration deals the shell's full damage, the biggest single hit available; only over-penetrations are damped, to ×0.10. |
| Superstructure | 13 mm | 1,200 (2% of HP) | Any HE ≥16 mm pens at full damage | Any HE ≥16 mm pens at full damage. HE-spam target, and the section saturates fast (often only a few thousand HP). |
| Turret (module, per magazine) | separate HP pool, does not drain ship HP | 24,200 magazine HP | Magazine detonation1–30% chance · below ~75% HP | Per-turret powder-magazine HP. Detonation chance scales from 1% (no mag damage) to 30% (full mag damage); this range is the in-game value. Detonation can't roll while the ship is above ~75% HP (the standard detonation-protection threshold, not a per-ship stat). Smaller magazines saturate to the 30% ceiling faster. |
| Secondary mount (152 mm mount) | separate HP pool, does not drain ship HP | 800 per-mount HP | Destroyed at 0 HP | Per-mount HP for the heaviest secondary on this ship. A mount destroyed at 0 HP is out for the rest of the battle; DCP does not repair destroyed mounts. Smaller (lighter-caliber) secondaries typically share the same HP value. |
| Rudder (module) | separate HP pool, does not drain ship HP | 14,500 module HP | Incapacitated at 0 HP | When module HP reaches 0 the rudder locks at its current angle until DCP repairs it. Repair via Damage Control Party. |
Saturation cap = HP a section can absorb before further damage to it is reduced (the "bow-tank" effect). Citadel pool is ~165k on every ship (effectively no cap); damage is gated by pen/over-pen multipliers instead. Superstructure saturates fast but HE always pens regardless of the plate thickness. Rudder (and other module HPs) are a separate pool from ship HP: damaging a module doesn't drain ship HP. Incapacitated modules like the rudder and engine are restored by DCP, but secondary and AA mounts destroyed at 0 HP stay out for the rest of the battle.
Every custom exterior Rio de Janeiro can equip, from in-game data.
Filtered to official World of Warships: Legends pages where this ship is a focus, reward, line member, or high-context variant mention.