Fairmile B (ML345)

Fairmile B (ML345)

MGB-61

Dark Adventurer

Fairmile B (ML345)

MGB-61

Dark Adventurer

Britain

II Rank

Battle rating:

AB	RB	SB
2.0	2.0	2.0

Class:

Motor gun boat

Boat

Research:9 200

Purchase:16 000

Show in game

Description

The Fairmile B (ML345) is a rank II British motor gun boat with a battle rating of 2.0 (AB/RB/SB). It was introduced in Update 1.83 "Masters of the Sea" as part of the British fleet closed beta test.

General info

Survivability and armour

Fairmile B (ML345) internals (starboard side).

Fairmile B (ML345) has the following armour layout:

• 47 mm 3 pdr QF Hotchkiss gunshield: 8 mm, anti-fragmentation armour
• 20 mm/70 Oerlikon Mk.II (single) gunshield: 12.7 mm, hardened armour
• 20 mm/70 Oerlikon Mark V (twin) gunshield: 12.7 mm, hardened armour
• Hull: 28 mm, wood
• Superstructure: 15 mm, wood

Any gun in the game is able to penetrate anywhere on the boat, including the gunshields, at practically any range.

Fairmile B (ML345) can be hull-broken by any gun with an HE round with a large enough explosive mass. In general, guns capable of hull-break are those with a bore diameter greater than 4 inches (102 mm). Hull-break triggers when such a HE round hits and destroys any hull compartment — or the bridge in some cases — resulting in the instant destruction of the rest of the boat. At Fairmile B (ML345)'s battle rating, the only guns capable of hull-breaking her are the 8cwt QF Mk I (found on Dark Adventurer) and the 10.5 cm SK C/32 (found on AF D3.

Fairmile B (ML345)'s hull is split into four compartments. The first compartment starts at the bow and ends in front of the bridge, just aft of the pumps. The second starts at the bridge and ends at the funnel. The third starts at the funnels and ends in front of the aft twin 20 mm Oerlikon Mk.V mount. The fourth starts at that gun mount and ends at the stern. With a crew complement of 18, overall survivability is average.

Fairmile B (ML345) has two ammunition storages. The first is located in the bow, below and in front of the fore 47 mm 3 pdr QF Hotchkiss cannon; it is emptied when there is only one round of ammunition remaining for that gun. The other ammunition storage is located in the stern, just above the waterline and in front of the steering gear; it is emptied when the only remaining ammunition for the secondary gun mounts are in the guns themselves (i.e. the ammunition counter reads "x/0"). Destroying either ammunition storage will instantly destroy the rest of the boat.

Mobility

Mobility Characteristics
Game Mode	Upgrade Status	Maximum Speed (km/h)		Turn Time (s)	Turn Radius (m)
		Forward	Reverse
AB	Stock	37	14	~55.47	~68.66
	Upgraded	50	19	~33.67	~37.21
RB/SB	Stock	32	12	~65.30	~77.95
	Upgraded	37	14	~48.14	~57.46

Fairmile B (ML345) has a displacement of 65 tons.

Armament

Primary armament

For her primary armament, Fairmile B (ML345) has one 47 mm 3 pdr QF Hotchkiss cannon in a single mount, mounted centreline on the bow. It has 300 rounds of ammunition available for it. The mount can traverse horizontally at a rate of 40°/s and vertically at a rate of 25°/s. The gun is single-shot and has a nominal rate of fire of 30 rounds/min. With a stock crew, it can be reloaded in 2.6 seconds; with an aced crew, they can be reloaded in 2 seconds.

Guidance for the Primary Gun Turret
Horizontal	Vertical
±180°	-10°/+70°

There is only one choice of ammunition available:

• 3 pdr Mk.2 HE

Penetration Statistics
Ammunition	Type	Penetration @ 0° Angle of Attack (mm)
		100 m	1,000	2,000 m	3,000 m	4,000 m	5,000 m
3 pdr Mk.2 HE	HE	6	6	6	6	6	6

Shell Details
Ammunition	Type	Projectile Mass (kg)	Velocity (m/s)	Explosive Type	Explosive Mass (kg)	TNT Equivalent (kg)	Fuse Delay (m)	Fuse Sensitivity (mm)	Ricochet
									0%	50%	100%
3 pdr Mk.2 HE	HE	1.5	517	TNT	0.217	0.217	0.15	N/A	79°	80°	81°

Secondary armament

For her secondary armament, Fairmile B (ML345) has one 20 mm/70 Oerlikon Mk.II cannon and two 20 mm/70 Oerlikon Mk.V cannons.

The one 20 mm/70 Oerlikon Mk.II cannon is fitted in a single mount, mounted centreline amidships behind the funnel. It has 2,040 rounds of ammunition available. The mount can traverse horizontally at a rate of 75°/s and vertically at a rate of 75°/s. The gun has a belt capacity of 60 rounds and has a rate of fire of 450 rounds/min. With a stock crew, it can be reloaded in 4 seconds; with an aced crew, it can be reloaded in 2 seconds. Its maximum range against surface targets is roughly 2.1 km.

The two 20 mm/70 Oerlikon Mk.V cannons are fitted in a twin mount, mounted centreline aft. It has 4,080 rounds of ammunition available, 2,040 rounds per gun. The mount can traverse horizontally at a rate of 65°/s and vertically at a rate of 65°/s. Each gun has a magazine capacity of 60 rounds and has a stated rate of fire of 450 rounds/min, though in actuality, the gun on the gunner's right side has a slightly greater rate of fire, around 485 rounds/min. With a stock crew, the guns can be reloaded in 8 seconds; with an aced crew, they can be reloaded in 4 seconds. Their maximum range against surface targets is roughly 2.1 km.

Turrets are named sequentially, clockwise, starting at the bow

Guidance for the Secondary Gun Turrets
No.1 Turret (1x 20 mm/70 Oerlikon Mk.II)		No.2 Turret (2x 20 mm/70 Oerlikon Mk.V)
Horizontal	Vertical	Horizontal	Vertical
±147°	-5°/+60°	±140°	-4°/+62°

All armament in the secondary armament group share the same ammunition choices, of which there are three:

• Universal: HEF-T/HEF-I/AP-T

• 20 mm HE: HEF-T/HEF-I/AP-T/HEF-I

• 20 mm AP: AP-T/AP-T/AP-T/HEF-I

Penetration Statistics
Ammunition	Penetration @ 0° Angle of Attack (mm)
	10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
Universal	39	36	29	23	20	17
20 mm HE	39	36	29	23	20	17
20 mm AP	39	36	29	23	20	17

Anti-aircraft armament

For her anti-aircraft armament, Fairmile B (ML345) has four 7.72 mm Lewis 1916 machineguns in two twin mounts, one on either side of the bridge. For each mount, there are 3,880 rounds of ammunition available, 1,940 rounds per gun, for a total of 7,760 rounds. There are no stated horizontal or vertical traverse rates given in-game, but the mounts handle very similarly, if not exactly, to other twin and quadruple 7.72 mm Lewis 1916 machinegun mounts which can all traverse horizontally at a rate of 75°/s and vertically at a rate of 75°/s. Each gun has a magazine capacity of 97 rounds and has a rate of fire of 550 rounds/min. With a stock crew, the guns can be reloaded in 18.2 seconds; with an aced crew, they can be reloaded in 14 seconds. Their maximum range against surface targets is roughly 1.6 km.

Turrets are named sequentially, clockwise, starting at the bow

Guidance for the Anti-Aircraft Gun Turrets
No.1 Turret (starboard)		No.2 Turret (port)
Horizontal	Vertical	Horizontal	Vertical
-30°/+45°	-5°/+50°	-45°/+30°°	-5°/+50°

No ammunition choices are available for this gun. Though not directly stated in-game, the guns fire one tracer round every other round, so they most likely use the standard Default 7.72 mm Lewis 1916 machinegun belt which has the following composition:

• Default: AP/T/AP/T

Penetration Statistics
Ammunition	Penetration @ 0° Angle of Attack (mm)
	10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
Default	20	19	16	13	11	10

Special armament

Mk.VII depth charges numbered 1-14 according to their drop order (click to expand).

Fairmile A (ML100) can carry up to 14 Mk.VII depth charges and 6 Y-gun Mk.VII depth charges.

The 14 Mk.VII depth charges are mounted along the sides of the boat, 7 on either side with 3 in front of the aft gun mount and 4 behind. The depth charges are dropped one at a time in this order (see the image): foremost to aftmost, alternating port and starboard sides, starting with the foremost depth charge on the port side.

The 6 Y-gun Mk.VII depth charges are fired from a Y-gun depth charge thrower mounted in front of the aft gun mount. Aside from the 2 already on the Y-gun, there are an additional 4 depth charges stored just aft of the Y-gun, 2 per side; these lack a visual model but can still be damaged. In the hangar X-ray view, all 4 are present; however, in battle, the forward pair is missing. The remaining aft pair disappear once two depth charges have been fired on their respective side; that is, there is only one depth charge remaining on that side. The Y-gun has one arm pointed to either side and will fire either the port or starboard depth charge depending on the direction the player is currently looking. After firing a depth charge, there is a reload of approximately 10 seconds.

Before spawning, the detonation time delay for both types of depth charges can be set anywhere between 3 seconds and 10 seconds.

Depth Charge Characteristics (Mk.VII depth charge)
Mass (kg)	Explosive Type	Explosive Mass (kg)	TNT Equivalent (kg)
196	TNT	130	130

Depth Charge Characteristics (Y-gun Mk.VII depth charge)
Mass (kg)	Explosive Type	Explosive Mass (kg)	TNT Equivalent (kg)
196	TNT	130	130

Usage in battles

Ammunition Choices

For the 20 mm Oerlikon Mk.II and 20 mm Oerlikon Mk.V cannons, the best ammunition choice is the 20 mm HE because it has the highest ratio of HE rounds to AP rounds, meaning that it will be the most effective against both aircraft and surface targets. The 20 mm HE belt should be the main ammunition choice, though a few of the 20 mm AP belt should also be taken into battle for use against armoured targets. There is no reason to use the Universal belt once the other options have been researched.

Depth Charges

Being anti-submarine weapons and with the present lack of submarines in the game, there is practically no reason to use them. While they can be used against surface targets to some success by dropping them right next to a slower target, this is extremely situational. If attempting this, remember the order in which the depth charges drop and that there is no reason to use any depth charge activation time setting above the minimum 3 seconds, since higher delay times means the depth charge will sink further, and thus away, from the target. Again, it should be reiterated that this is very situational.

There is no practical reason to use depth charges in battle, especially since, if they're not dropped, they essentially become unarmoured ammo racks.

Modules

Tier	Seakeeping	Unsinkability		Firepower
I	Dry-Docking	Tool Set		20 mm HE	Anti-Air Armament Targeting
II	Rudder Replacement	Fire Protection System	Smokescreen	20 mm AP	Auxiliary Armament Targeting
III	Propeller Replacement			Improved Rangefinder	Primary Armament Targeting	Depth Charges
IV	Engine Maintenance	New Pumps			Artillery Support	Bomb mortar

Pros and cons

Pros:

• Good firepower
• Secondary armament: great damage output; large magazine size
• Large amount of depth charges

Cons:

• Ammo rack in the bow
• Primary armament: low damage output; low muzzle velocity; low accuracy
• Anti-aircraft armament: very low damage output; long reloads; poor against aircraft
• Poor top speed and manoeuvrability

History

The Fairmile B first left the production line in September 1940 and entered service shortly after. These motor-launched boats served in many invasion operations, such as the D-Day landings at Normandy, and the St Nazaire Raid.

Some Fairmile B vessels were designated as medical ships attached to marine invasion infantry units and underwent modifications to expand their sickbays to accommodate more casualties.

The Fairmile B was operated by Commonwealth nations during and after the Second World War. Bermuda, New Zealand, Australia and South Africa used the Fairmile B, primarily as patrol boats. The Fairmile B also served up to the 1980s with the Guardia di Finanza, an Italian naval gendarmerie.

The rockets stowed alongside the bridge and the launchers forward of it are Mk 2 Rocket Flares and their projectors.

Media

See also

• Fairmile A (ML100)
• MGB-61
• HMS Liscomb

External links

Paste links to sources and external resources, such as:

• topic on the official game forum;
• encyclopedia page on ship;
• other literature.