Thrasher

13.3

Submarine | U.K. | Tier X

Tech Tree Position

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Battle Levels

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X

28,000,000

Thrasher — British Tier X submarine.

The Royal Navy's T-class submarines were designed in the 1930s to replace the O, P, and R classes. The submarines built during the war differed from their pre-war sister ships by having a welded hull and an additional aft torpedo tube. HMS Thrasher was built at the Cammell Laird shipyard in Birkenhead between 1939 and 1941. When World War II broke out, the submarine was transferred to the Mediterranean, where she sank 20,000 tons of enemy shipping. In 1945, Thrasher was assigned to the Pacific Theater of war, where she sank 24 enemy ships.

Thrasher was first released for sale on DD MMM YYYY.

Modules

	Rate of Fire (shots/min)	180° Turn Time (sec)	Maximum Dispersion (m)	Maximum HE Shell Damage (HP)	Chance of Fire on Target Caused by HE Shell (%)	Maximum AP Shell Damage (HP)		Research price (exp)	Purchase price ()
102 mm/40 QF Mk.XII on an SI mount	12	18	36					0	2,000,000

	Hit Points (HP)	Armor (mm)	Armor (mm)	Main Turrets (pcs.)	Secondary Gun Turrets (pcs.)	AA Mounts (pcs.)	Torpedo Tubes (pcs.)	Hangar Capacity (pcs.)		Research price (exp)	Purchase price ()
Thrasher	16,800	6	25	1			11			0	3,000,000

	Rate of Fire (shots/min)	Torpedo Tubes Reload Time (sec)	180° Turn Time (sec)	Maximum Damage (HP)	Torpedo Speed (knot)	Torpedo Range (km)		Research price (exp)	Purchase price ()
533 mm Mk VIII	1.5	40	15	6,800	75	11		0	2,000,000
533 mm Mk VIII	1.5	40	15	8,166	78	12		38,000	2,500,000

	Rate of Fire (m/s)	Torpedo Range (km)		Research price (exp)	Purchase price ()

	Maximum Speed (knot)		Research price (exp)	Purchase price ()
Propulsion: 2,500 hp	26		0	2,000,000

Compatible Upgrades

Slot 1
Slot 2		Damage Control System Modification 3
Slot 3
Slot 4
Slot 5	Torpedo Tubes Modification 3	Reinforced Bulkheads
Slot 6

Player Opinion

Performance

Overview

Tier X Thrasher is the successor to the British submarine Sturdy, with substantial improvements to her offensive firepower but only incremental upgrades in survivability. She is the only British submarine in the game with a manually controlled deck gun. Her role focuses on her excellent homing torpedoes, with captains utilizing them in mid- to long-range engagements.

Hull

Thrasher is a welcome upgrade in survivability when compared to Sturdy, but is the worst overall when compared to her Tier X peers. She has the worst concealment at 6.1km, so many Tier X destroyers and all Tier X subs to outspot her. Her 16,800 hit-point pool is small for a submarine, and she is covered in 19 mm armor from bow to stern. Captains should avoid being spotted while surfaced or submerged as she doesn’t have the HP pool to take many hits. Thrasher’s handling is one of her strongest traits. She has the best-in-class rudder shift time at 6 seconds with an average turning radius of 580 m. Her diving performance is excellent, with the fastest diving plane shift time and dive speed at 15.6 seconds and 3.5 m/s respectively. Despite her excellent handling, Thrasher is the slowest submarine at her tier, with a top speed of 26 knots when surfaced and 18 knots when submerged. Her dive capacity is best-in-class at 340 units, allowing her to stay submerged for up to 5 minutes and 40 seconds. Upgrades to her dive capacity push her battery time to over 6 minutes, giving captains ample time to stay submerged. However, Thrasher’s battery recharge rate is the worst in tier at 0.6 units/s, so she spends much more time recharging her battery compared to her peers.

Armament

Like the other British tech-tree submarines, Thrasher only has access to homing torpedoes, with no option to utilize conventional torpedoes. Her sonar has a 12 km range with 500 m/s ping velocity and 6 s reload time. As with other subs of her tier, Thrasher’s single pings last for 25 s while her double pings last for 65 s, giving her homing torpedoes ample time to track targets. When upgraded, they have a 12 km range, deal 7,833 damage per torpedo, go 78 knots, and have a relatively high flooding chance of 42%. While these homing torpedoes are slower than those of her peers, they also are stealthier with a 1.7 km detectability range. This gives Thrasher an 8.1 s torpedo reaction time compared to the 10 s reaction times of other Tier X submarines. Thrasher has eleven torpedo tubes, with eight on the bow and three on the stern. Each rear torpedo tube has its own fixed angle, which can be awkward in close quarters combat as she needs to swing her stern to get all three torpedoes off at a nearby target. Her torpedoes have a 40 s reload, with the bow tubes reloading in groups of four and the stern tubes all reloading at once. Although Thrasher possesses no conventional torpedoes, she still has the capability to launch at close range. However, captains should only stick to shotgunning lightly armored or low health ships, as the heavy torpedo protection of capital ships significantly reduces the 62,664 maximum alpha of her bow torpedo tubes.

Thrasher is unique compared to her predecessors, as she allows players to directly control the single deck gun found on her superstructure. It is only usable when she is fully surfaced, making her vulnerable to counterattack. The gun’s shells and handling are nothing noteworthy. Its firing arcs cover the port, bow, and starboard, but the stern is unreachable. The turret traverse time is slow at 18 s, making it cumbersome to use within its 6 km firing range. Thrasher’s gun fires a single SAP shell every five seconds with a DPM of 27,000. It is best to utilize her deck gun to finish off lightly armored enemies that are at low health, as it can do more reliable damage that cannot be mitigated as well as homing torpedoes.

Consumables

Thrasher carries a standard Damage Control Party with three available charges and a long 15 s duration. This allows players ample time to disengage without the risk of module damage, floods, and fires compromising their ship. Due to the limited charges, players should be careful and deliberate with its use, as it could make the difference between life and death.

Thrasher’s Hydrophone is amongst the worst of her peers. Compared to the unlimited charges that other Tier X submarines carry, she only has six charges to use throughout a game. She also has the worst hydrophone range of the tier with a 6 km detection radius, which is shorter than her concealment. In comparison, every other Tier X sub has a hydrophone range greater than its concealment. Thrasher does not have the ability to detect the presence of unspotted ships unless they are within her concealment range. Other submarines have the capability to see potential threats in their vicinity at a relatively safe distance. Thrasher does not have the same luxury, as she cannot effectively use her hydrophone unless she is already in a risky situation. Despite these shortcomings, Thrasher’s hydrophone reloads faster and gives spotting updates more frequently than her peers. This is a significant advantage only if she fights ships that are within that 6 km range. Because of these limitations, Thrasher’s hydrophone is best used in self-defense to help her confront sticky situations.

Thrasher’s Submarine Surveillance is the only way she can detect submerged enemy submarines. She is tied with the American submarines in having the worst range of 6.6 km. This is a considerable weakness when enemy subs with longer surveillance range spot her without any way for Thrasher to spot them in return. Combined with her large surface concealment and poor hydrophone range, it is risky for her to fight other subs as she can easily be punished while submerged and chased down while on the surface with no way to re-submerge.

Gameplay

Thrasher’s gameplay revolves around her excellent homing torpedoes, saturating a flank with sheer torpedo volume and focusing down ships within her range. Captains should stay near allied destroyers as they provide spotting and screening from potential threats. She is best played in open areas that enable her to freely target exposed vessels. Since the torpedoes reload in groups of four and each group reloads in under a minute, players have many opportunities to stagger their torpedoes to make evasion difficult. Getting double pings on enemy ships greatly increases the likelihood of your torpedoes hitting, but pinging will also give away your presence to the enemy. It is inadvisable to play Thrasher as a front-line vessel, as she lacks the advanced warning capabilities of her peers and is vulnerable when caught. Her role is defensively oriented, as her weak survivability and lack of standard torpedoes make aggressive plays unnecessary. She still can make those plays, but her peers generally do it better.

Pros:

Cons:

Research

Unlike most Tier X ships, Thrasher has modules to research:

Sonar: Upgrade to ASDIC 10 Mod. B for a faster sonar reload.
Torpedoes: Upgrade to 533 mm Mk VIII for better homing torpedo damage, range and flooding chance.

Optimal Configuration

Upgrades

The recommended upgrades are:

Slot 1:
Slot 2:
Slot 3:
Slot 4:
Slot 5:
Slot 6:

Commander Skills

Recommended Commander Skills
Cost (points)	Attack			Defense
1	Enhanced Sonar -10% to sonar reload time when the boat is detected by an enemy.	Liquidator +30% chance of a torpedo strike causing flooding.	Helmsman Within 15 seconds of using the Hydrophone consumable: -10% to the shift times of the rudder and dive planes.	Priority Target The detection indicator additionally shows the number of opponents that are currently aiming at you with their main battery guns.	Incoming Fire Alert A warning about a salvo fired at your ship from a distance of more than 4.5 km.
2	Improved Battery Capacity +10% to the total Dive Capacity -20% Dive Capacity Recharge Rate per second.	Torpedo Crew Training -15% torpedo tubes reload time while detected by an enemy.	Consumables Enhancements +5% to the action time of the boat's consumables.	Preventive Maintenance -30% to the risk of the main turrets [sic], torpedo tubes, steering gear, or engine becoming incapacitated.	Last Stand The boat remains partially able to sustain speed and maneuverability with the engine and steering gears incapacitated.
3	Enhanced Impulse Generator If less than 33% of the maximum dive capacity remains: +15% sonar ping velocity.	Sonarman +25% to the duration of a ping effect on a sector highlighted once. -15% to the duration of a ping effect on a sector highlighted twice.	Consumables Specialist -15% to the preparation and reload time of the boat's consumables.	Watchful If undetected, displays an indicator showing that the boat is within range of activated enemy Hydroacoustic Search, Surveillance Radar, or Submarine Surveillance consumables. If you change depth while the indicator is displayed, you may be detected..	Superintendent +1 charge to all consumables.
4	Adrenaline Rush For every 1% of HP lost, –0.25% to each of: * Main battery reload time * Sonar cooldown time * Torpedo tube reload time * Airstrike armament reload time * Secondary battery reload time.	Torpedo Aiming Master When launching homing torpedoes at a ship with a sector that is highlighted twice, torpedo damage is increased. The sector highlighted twice needs to remain active until the torpedoes hit the ship. +15% to torpedo damage.	Sonarman Expert When a sector is highlighted within 30 seconds of using the Hydrophone consumable: +25% to ping effect duration.	Improved Battery Efficiency If less than 50% of the maximum dive capacity remains: +25% Dive Capacity Recharge Rate per second.	Enlarged Propeller Shaft While less than 50% of the maximum dive capacity remains: +18% to the boat's speed on the surface and at periscope depth.
Key: ★★★ - Extremely Useful ★★ - Frequently Useful ★ - Occasionally Useful No stars - Not Useful

Consumables

Thrasher equips the following consumables:

Slot 1: Damage Control Party  – 3 charges
Slot 2: Hydrophone  – 6 charges
Slot 3: Submarine Surveillance

Signals

Recommended Signal Flags
Combat
Juliet Charlie -100% to the risk of magazine detonation.	Juliet Yankee Bissotwo -20% to flooding duration.	India Yankee -20% to fire duration.	Hotel Yankee -20% to damage received when ramming the enemy. +50% to damage dealt when ramming the enemy.	Victor Lima +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. +4% chance of torpedoes causing flooding.	India X-Ray +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. +5% to the risk of your ship's magazine detonating.
Juliet Whiskey Unaone +15% chance of causing flooding. +5% to the risk of your ship's magazine detonating.	Mike Yankee Soxisix +5% to secondary battery maximum firing range. -5% to maximum dispersion of secondary battery shells. -5% to secondary battery loading time.	November Echo Setteseven +5% continuous AA damage at all ranges. +5% damage from flak bursts.	Sierra Mike +5% to the ship's maximum speed.	November Foxtrot -5% reload time on all consumables.	India Delta +20% to the amount of HP recovered when Repair Party  is used.
X-Ray Papa Unaone +10% action time of a Smoke Generator .	Sierra Bravo +10% action time of Hydroacoustic Search  -10% reload time of Defensive AA Fire .

Note: Use of the Juliet Charlie signal makes detonation impossible.

Gallery

References

Ships of U.K.

Destroyers	II Medea • III Valkyrie • III Campbeltown • IV Wakeful • V Acasta • VI Icarus • VI Gallant • VII Jervis • VII Jupiter '42 • VIII Lightning • VIII Cossack • VIII Cossack B • IX Jutland • IX Somme • X Daring • X Druid
Cruisers	I Black Swan • II Weymouth • III Caledon • IV Danae • V Emerald • V Hawkins • V Exeter • VI Leander • VI Devonshire • VI London • VI Dido • VI Orion '44 • VII Fiji • VII Surrey • VII Belfast • VIII Edinburgh • VIII Albemarle • VIII Cheshire • VIII Tiger '59 • VIII Belfast '43 • VIII Hampshire • VIII Nottingham • VIII AL Cheshire • VIII STAR Edinburgh • IX Neptune • IX Drake • X Monmouth • X Minotaur • X Goliath • X Plymouth • X Gibraltar • X Defence • ★ Edgar
Battleships	III Bellerophon • III Indefatigable • III Dreadnought • IV Orion • IV Queen Mary • V Iron Duke • V Tiger • V Agincourt • VI Warspite • VI Queen Elizabeth • VI Renown • VI Repulse • VI Repulse B • VII King George V • VII Rooke • VII Hood • VII Nelson • VII Duke of York • VII Collingwood • VII Renown '44 • VII Duke of Bronte • VIII Monarch • VIII Hawke • VIII Vanguard • IX Lion • IX Duncan • IX Marlborough • IX Scarlet Thunder • X Conqueror • X St. Vincent • X Thunderer • X Incomparable • ★ Devastation
Aircraft Carriers	IV Hermes • VI Furious • VI Ark Royal • VIII Implacable • VIII Indomitable • VIII Colossus • X Audacious • X Malta • ★ Eagle

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Compatible Upgrades