World of Warships Supertest: Pan-European Tier VII Destroyer Grom
5 min readHistorical background
ORP Grom was the lead ship of a pair of destroyers serving in the Polish Navy and built the British shipbuilder J. Samuel White. Grom was laid down in July 1935; launched in July 1936 and commissioned in May 1937.
At the end of August 1939, Grom, alongside her sistership Błyskawica and the older ORP Burza executed the Peking Plan as a war with Germany was guaranteed at this point. The Polish Navy would find itself cornered in the Baltic Sea by the overwhelming Kriegsmaserine forces. As such, all three ships set sail to reach Great Britain. This decision was the right one as the remaining Polish ships left in the Baltic Sea were quickly either sunk or captured when the Invasion of Poland began.
Afterward, during the Norwegian campaign, Grom would make herself a reputation as the most hated of all Allied forces as she very often deployed along the coastline, opening fire on German ground forces when given the opportunity. Sadly, her reputation ended up being her doom. At the beginning of May 1940, while on a gunfire support mission in the Narvik region, she was targeted by a Heinkel He 111. The ship was hit by two bombs, causing an internal explosion that quickly sent her to the bottom.
Her wreck remained untouched until October 1986 when she was explored by divers.
Ship’s preview
Ship’s permanent camouflage
For the classic reminder, this is a ship in testing, anything can change so don’t look at her like she would already be released.
Modules
Hull | Engine | Gun Fire Control System | Main battery | Torpedoes |
Grom (A) | Propulsion: 54 000 HP | SUO Mk 7 Mod. 1 | ![]() 120 mm/50 wz.36 Bofors on a shielded mount | Mark 10 |
Grom (B) | SUO Mk 7 Mod. 1 |
General Characteristics
Stock Ship
Tier | VII |
Health | 12 900 HP |
Torpedo Damage Reduction | 0 % |
Displacement | 2 011 tons |
Dimensions | |
Overall length | 114.0 m |
Beam | 11.01 m |
Overall height (keel to the highest point on the ship) | 14.2 m |
Freeboard | 3.2 m |
Main Armament | |
Maximum Firing Range | 9.930 km |
120 mm/50 wz.36 Bofors on a shielded mount | 3 x 2 120 mm 1 x 1 120 mm |
Torpedo Armament | |
Maximum Firing Range | 6.000 km |
533 mm potrójna | 2 x 3 533 mm |
Maximum speed | 39.0 knots |
Turning Circle Radius | 610 m |
Rudder Shift Time | 5.98 s |
Surface Detectability | 7.0 km |
Air Detectability | 3.07 km |
Detectability After Firing Main Guns in Smoke | 2.57 km |
Main Armament
3 x 2 120 mm/50 wz.36 Bofors on a shielded mount 1 x 1 120 mm/50 wz.36 Bofors on a shielded mount | |
Maximum Firing Range | 9.930 km |
Reloading Time | 6.0 s |
180 Degree Turn Time | 18.0 s |
Optimal firing angles at the front | 30° |
Optimal firing angles at the rear | 33° |
Sigma | 2.0 sigma |
Maximum Dispersion | 89 m |
Shells | |
Type of Projectile | HE – 120 mm HE![]() |
Alpha Damage | 1 700 |
Penetration capacity | 20 mm |
Explosion size | 6.0 m |
Fire chance | 8 % |
Projectile Speed | 900 m/s |
Air Drag | 0.318 |
Projectile Mass | 24.0 kg |
Type of Projectile | AP – 120 mm AP![]() |
Alpha Damage | 2 200 |
Projectile Speed | 900 m/s |
Air Drag | 0.318 |
Projectile Mass | 24.0 kg |
Projectile Krupp | 1 721 |
Projectile Detonator | 0.01 s |
Detonator threshold | 20 mm |
Ricochet Angles | 45° – 60° |
Torpedo Armament
2 x 3 533 mm potrójna Torped M1924 mod 2 ![]() | |
Reloading Time | 75 s |
Maximum Distance | 6.000 km |
Optimal firing angles at the front | 53° |
Optimal firing angles at the rear | 60° |
Damage | 7 533 |
Flooding Chance | 119% |
Speed | 72 knots |
Surface Detectability | 1.6 km |
Anti-air Armament
2 x 1 40 mm/56 Bofors L/60 Model 1936 on a single mount | |
Sector firing range | 0.1 km – 3.5 km |
Hit chance | 100 % |
Sector’s damage | 13 |
Sector’s damage frequency | 0.29 s |
Sector’s damage per second | 46 |
4 x 2 13.2 mm Hotchkiss wz.1930 | |
Sector firing range | 0.1 km – 1.5 km |
Hit chance | 95 % |
Sector’s damage | 15 |
Sector’s damage frequency | 0.29 s |
Sector’s damage per second | 53 |
ASW Armament
Shipborne depth charges![]() | |
Reloading Time | 40 s |
Number of charges | 2 |
Number of bombs in payload | 8 |
Damage | 2 400 |
Sink speed | 21.5-32.2 m/s |
Explosion radius | 800 m |
Fire chances | 10% |
Flooding chances | 15% |

Consumables
Consumables | |||
Slot 1 | Slot 2 | Slot 3 | |
Damage Control Party ![]() Cooldown: 40 s | Smoke Generator Work time: 20 s Cooldown: 160 s Smoke radius: 450 m Smoke duration: 85 s | Engine Boost ![]() Work time: 90 s Cooldown: 90 s Speed bonus: +8% |
Fully Upgraded Ship
Tier | VII |
Health | 15 500 HP |
Torpedo Damage Reduction | 0 % |
Displacement | 3 383 tons |
Dimensions | |
Overall length | 114.0 m |
Beam | 11.01 m |
Overall height (keel to the highest point on the ship) | 14.2 m |
Freeboard | 3.2 m |
Main Armament | |
Maximum Firing Range | 10.923 km |
120 mm/50 wz.36 Bofors on a shielded mount | 3 x 2 120 mm 1 x 1 120 mm |
Torpedo Armament | |
Maximum Firing Range | 6.000 km |
533 mm potrójna | 2 x 3 533 mm |
Maximum speed | 39.0 knots |
Turning Circle Radius | 610 m |
Rudder Shift Time | 4.28 s |
Surface Detectability | 7.0 km |
Air Detectability | 3.07 km |
Detectability After Firing Main Guns in Smoke | 2.57 km |
Main Armament
3 x 2 120 mm/50 wz.36 Bofors on a shielded mount 1 x 1 120 mm/50 wz.36 Bofors on a shielded mount | |
Maximum Firing Range | 10.923 km |
Reloading Time | 6.0 s |
180 Degree Turn Time | 18.0 s |
Optimal firing angles at the front | 30° |
Optimal firing angles at the rear | 33° |
Sigma | 2.0 sigma |
Maximum Dispersion | 97 m |
Shells | |
Type of Projectile | HE – 120 mm HE![]() |
Alpha Damage | 1 700 |
Penetration capacity | 20 mm |
Explosion size | 6.0 m |
Fire chance | 8 % |
Projectile Speed | 900 m/s |
Air Drag | 0.318 |
Projectile Mass | 24.0 kg |
Type of Projectile | AP – 120 mm AP![]() |
Alpha Damage | 2 200 |
Projectile Speed | 900 m/s |
Air Drag | 0.318 |
Projectile Mass | 24.0 kg |
Projectile Krupp | 1 721 |
Projectile Detonator | 0.01 s |
Detonator threshold | 20 mm |
Ricochet Angles | 45° – 60° |
Torpedo Armament
2 x 3 533 mm potrójna Torped M1924 mod 2 ![]() | |
Reloading Time | 75 s |
Maximum Distance | 6.000 km |
Optimal firing angles at the front | 53° |
Optimal firing angles at the rear | 60° |
Damage | 7 533 |
Flooding Chance | 119% |
Speed | 72 knots |
Surface Detectability | 1.6 km |
Anti-air Armament
2 x 2 40 mm/56 Bofors on a №3 mount | |
Sector firing range | 0.1 km – 3.5 km |
Hit chance | 100 % |
Sector’s damage | 25 |
Sector’s damage frequency | 0.29 s |
Sector’s damage per second | 88 |
4 x 2 13.2 mm Hotchkiss wz.1930 | |
Sector firing range | 0.1 km – 1.5 km |
Hit chance | 95 % |
Sector’s damage | 15 |
Sector’s damage frequency | 0.29 s |
Sector’s damage per second | 46 |
ASW Armament
Shipborne depth charges![]() | |
Reloading Time | 40 s |
Number of charges | 2 |
Number of bombs in payload | 8 |
Damage | 2 400 |
Sink speed | 21.5-32.2 m/s |
Explosion radius | 800 m |
Fire chances | 10% |
Flooding chances | 15% |

Consumables
Consumables | |||
Slot 1 | Slot 2 | Slot 3 | |
Damage Control Party ![]() Cooldown: 40 s | Smoke Generator Work time: 20 s Cooldown: 160 s Smoke radius: 450 m Smoke duration: 85 s | Engine Boost ![]() Work time: 90 s Cooldown: 90 s Speed bonus: +8% |
The Armor
External armor protection:
Personal Opinion
Well… Grom is literally Błyskawica but worse. She has the same HP pool, the same firepower, the same speed, and the same concealment but then she also has a worse firing range, much worse torpedoes, and a weaker Engine boost.
In return, the ship gets better concealment by about 500 m and better rudder shift time. While the better concealment is appreciable, it isn’t anything to write home about. For the rudder shift time, considering that most destroyers have an already fast rudder shift, it isn’t particularly relevant.
Considering that Błyskawica herself isn’t a particularly appealing ship these days, you can already guess how Grom will be doing.
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