Fairmile A (ML100)

Fairmile A (ML100)

MTB-1(1)

MGB-61

Fairmile A (ML100)

MTB-1(1)

MGB-61

Britain

I Rank

Battle rating:

AB	RB	SB
1.0	1.0	1.0

Class:

Motor gun boat

Boat

Research:2 900

Purchase:700

Show in game

Description

The Fairmile A (ML100) is a rank I British motor gun boat with a battle rating of 1.0 (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 A (ML100) internals (starboard). The aft ammunition storage is partially obscured by the fuel tanks here.

Fairmile A (ML100) has the following armour layout:

• Hull: 24 mm, wood
• Superstructure: 2 mm, steel

Any gun in the game will easily be able to penetrate the hull and superstructure at any practical range.

Fairmile A (ML100) can be hull-broken by any gun that is greater than 4 inches (102 mm) in diameter. Hull-break is triggered when any such gun hits and destroys any hull compartment — or in some cases, the bridge — with a high-explosive round, upon which the rest of the boat will be destroyed. At Fairmile A (ML100)'s battle rating, there is only one gun capable of hull-breaking her:

• the 8cwt QF Mk I, found on Dark Adventurer.

Fairmile A (ML100)'s hull is split into four compartments. The first compartment starts at the bow and ends in the middle of the bridge, just in front of the pumps; the second ends just between the radio station and the engines, around the funnel; the third ends in front of the aft gun mount; and the fourth ends at the stern.

Fairmile A (ML100) has two ammunition storages. One is located in the bow below the fore twin 7.72 mm Lewis 1916 machinegun mount and holds the ammunition for all three Lewis 1916 machinegun mounts. The other ammunition storage is located in the stern on the port side, below and behind the aft 3 pdr QF Hotchkiss cannon, and holds the ammunition for the 3 pdr cannon. Both ammunition storages are located above the waterline and destroying either will instantly destroy the boat.

With a crew complement of 14, Fairmile A (ML100)'s overall survivability is average.

Mobility

Mobility Characteristics
Game Mode	Upgrade Status	Maximum Speed (km/h)		Turn Time (s)	Turn Radius (m)
		Forward	Reverse
AB	Stock	46	14	~40.88	~61.45
	Upgraded	62	19	~26.99	~39.38
RB/SB	Stock	40	12	~47.12	~70.83
	Upgraded	46	14	~37.33	~56.11

Fairmile A (ML100) has a displacement of 57 tons.

Armament

Primary armament

The primary armament consists of a single 47 mm 3 pdr QF Hotchkiss cannon mounted aft. There are 300 rounds of ammunition available for it. Stock, the mount can traverse horizontally at a rate of 34°/s and vertically at a rate of 21°/s; with the "Primary Armament Targeting" modification installed, this is increased to 40°/s and 25°/s respectively. The gun is single-shot with 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, it can be reloaded in 2 seconds.

Primary Armament Guidance
Horizontal	Vertical
±180°	-5°/+25°

There is only one ammunition choice available:

• 3 pdr Mk.2 HE

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

Shell Details
Ammunition	Type of warhead	Velocity (m/s)	Projectile Mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive Mass (TNT equivalent) (g)	Ricochet
							0%	50%	100%
3 pdr Mk.2 HE	HE	571	1.5	0	0.1	132	79°	80°	81°

Secondary armament

The secondary armament consists of six 7.72 mm Lewis 1916 machineguns in three twin mounts with one mount on the bow and two amidships. There are 3,880 rounds of ammunition available for each mount, 1,940 rounds per gun, for a total of 11,640 rounds. Stock, the mount can traverse horizontally at a rate of 64°/s and vertically at a rate of 55°/s; with the "Auxiliary Armament Targeting" modification installed, this is increased to 75°/s and 65°/s respectively. Each gun has a magazine capacity of 97 rounds and a rate of fire of 550 rounds/min. With a stock crew, the guns can be reloaded in 14 seconds; with an aced crew, they can be reloaded in 7 seconds.

Turrets are named sequentially, clockwise, starting at the bow

Secondary Armament Guidance
No.1 Turret (fore)		No.2 Turret (starboard)		No.3 Turret (port)
Horizontal	Vertical	Horizontal	Vertical	Horizontal	Vertical
±180°	-5°/+70°	±80°	-5°/+70°	±80°	-5°/+70°

There are three ammunition choices available:

• Universal: AP · T · AP · T

• 7.7 mm AP belt: AP · AP · AP · T

• 7.7 mm API belt: IT · IT · IT · AP

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	10	9	8	7	6	5
7.7 mm AP belt	10	9	8	7	6	5
7.7 mm API belt	10	9	8	7	6	5

Special armament

Mk.VII depth charges numbered according to their drop order (click to view a larger image).

Fairmile A (ML100) has four possible loadouts:

1. 12x Mk.VII depth charge
2. 5x Type M Mk I mines
3. Without load

The Mk.VII depth charges are carried in racks amidships, six on each side, between the funnel and the aft gun mount. They are dropped in the following order (see the image): fore to aft alternating port and starboard, starting at the foremost depth charge on the port side.

Before spawning, the detonation time delay can be set anywhere between 3 seconds and 10 seconds.

Depth Charge Characteristics
Mass (kg)	Explosive Type	Explosive Mass (kg)	TNT Equivalent (kg)
196	TNT	130	130

Type M Mk I mines numbered according to their drop order (click to view a larger image).

The Type M Mk I mines are carried one on the stern and four amidships, two on each side, between the funnel and the aft gun mount. They are dropped in the following order:

1. Stern
2. Port, foremost
3. Port, aftmost
4. Starboard, foremost
5. Starboard, aftmost

Mine Characteristics
Mass (kg)	Explosive Type	Explosive Mass (kg)	TNT Equivalent (kg)
600	TNT	227	227

Usage in battles

Fairmile A (ML100)'s secondary armament consists of the familiar 7.72 mm Lewis 1916 machinegun found on earlier boats in the British naval tech tree, and Fairmile A (ML100)'s guns suffer from the same drawbacks — low damage output, long reloads, and a small maximum range — making them very poor against both boats and aircraft. The low damage output is an even worse issue on Fairmile A (ML100), since a maximum of only four — often only two depending on the angle — out of the six guns can be brought to bear at once. This is essentially only half or worse of the firepower of MTB-1(1) whose armament wasn't the best to begin with.

Fortunately, Fairmile A (ML100) has a weapon earlier boats don't: the primary armament, a 47 mm 3 pdr QF Hotchkiss cannon. Unfortunately, the cannon isn't much better than the machineguns and suffers from its own set of problems. The 47 mm cannon is a single-shot weapon, and, while its reload is on par with similar calibre single-shot cannons, just like those other cannons, its damage output is abysmal and easily outclassed by any autocannon. The maximum range is also rather bad due to the cannon's low muzzle velocity and projectile mass. The accuracy isn't fantastic, and because of the reload in between each shot, correcting aim on targets further than 2 km, or even 1.5 km in many cases, can be quite the challenge. Like the machineguns, the cannon is also a poor anti-aircraft weapon due to its single-shot nature and lack of any airburst ammunition.

Fairmile A (ML100) has below-average survivability for her size with a complement of only 14. Her lack of any really effective armament, though, is really the deciding factor of her survivability. A way to extend survivability is to simply take out enemies before they have a chance to deal back any significant damage. Because of her underwhelming armament, Fairmile A (ML100) will always be unable to take out enemies as quickly as her contemporaries, increasing the damage she takes in the meantime. This makes Fairmile A (ML100)'s survivability very bad. To compensate for this, Fairmile A (ML100) is best played behind cover with the aft cannon facing the enemy, leveraging the element of surprise to deal as much damage as possible to any enemy that might come around the corner. Perhaps unintuitively, the machineguns can penetrate much more armour than the cannon, so be prepared to switch to the machineguns (default: Alt + 2) to deal with any armoured targets. Of course, because of the long reload and small magazine capacity, always fire off any remaining ammunition after engagements when using the machineguns to guarantee full magazines for the next engagement.

Ammunition Choices

For the 7.72 mm Lewis machinegun 1916, the best ammunition choice is the 7.7 mm AP belt since it has the highest ratio of AP to T rounds. While the 7.7 mm API belt may look tempting because of the incendiary tracer rounds, the IT rounds are actually stopped by most wooden hulls more often than not and rarely start fires, if ever. This belt is technically the best to use against aircraft, though with such a long reload to switch to it and with such a minuscule difference in damage anyway, there isn't much of a point in using it for that role either.

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 battle, especially since, if they're not dropped, they essentially become unarmoured ammo racks.

Modules

Tier	Seakeeping	Unsinkability		Firepower
I	Dry-Docking	Tool Set		7.7 mm AP belt
II	Rudder Replacement	Fire Protection System	Smokescreen	7.7 mm API belt	Auxiliary Armament Targeting
III	Propeller Replacement			Depth Charges	Primary Armament Targeting	Improved Rangefinder
IV	Engine Maintenance	New Pumps		Artillery Support	Mines

Pros and cons

Pros:

• Primary armament: can rotate 360°; good firing arcs
• Large amount of depth charges

Cons:

• Very weak firepower
• Inability to effectively deal with armoured targets
• Primary armament: low muzzle velocity; low damage output; low accuracy
• Secondary armament: can only bring 4 guns on target at once; very low damage output
• Poor survivability
• Poor top speed and manoeuvrability

History

In early 1939, Noel Macklin, a British industrialist, became aware of the Royal Navy's lack of anti-submarine boats through an article by Vice-Admiral Cecil Vivian Usborne. Macklin formulated a scheme in which prefabricated parts, built as near to completion as possible, would be sent in kit form ready for final assembly and fitting to the many minor boatbuilding companies throughout the country. This would allow parts and materials to be sourced from companies with no boatbuilding experience and assembled by unskilled labour at unutilized boatyards. Under this decentralized system, the boats could be manufactured quicker and cheaper than had they been manufactured at a single yard, all the while without straining major boatbuilding companies, such as Vospers, British Power Boat Co., White, or Thorycroft, which were needed to produce specialized, high-speed MTBs and MGBs. Macklin met with Vice-Admiral Usborne in May 1939, and immediately, they began assembling a team of naval engineers and designers and shortly thereafter formed the Fairmile Marine Company. Fairmile quickly produced a wooden motor launch design and proposed the idea to the Admiralty. Ultimately, the Admiralty declined to make an order. Nevertheless, convinced in the idea, Fairmile proceeded to produce a prototype as a private venture.

The prototype was ordered from Woodnutt & Co. at St Helens, Isle of Wight, on 27th July 1939 and was laid down on 29th October 1939. It had a hard chine hull and had a length overall of 110 ft, a beam of 17 ft 5 in, a draught of 4 ft 6 in, and a displacement of around 57 tons. It was powered by three Hall-Scott Defender petrol engines, each producing 600 bhp each, allowing it to achieve a top speed of 25 knots. With the prospect of war approaching ever closer, the Admiralty had no choice but to acknowledge the serious submarine threat and reconsidered Macklin's proposal. While the prototype was still under construction, the Admiralty purchased in the summer of 1939. This order was followed by another on 22nd September 1939 for an additional 24 boats, though this was later revised to 11 Fairmile designs — the Fairmile A type — and 13 boats of a new Admiralty design — the Fairmile B type. The twelve Fairmile A motor launches were built by ten different companies and were all be completed between May and June 1940, all twelve entering service shortly after completion as MLs 100-111.

Interestingly, the Fairmile A motor launches were ordered by the Admiralty without a specified armament. As such, the decks of the boats were not built to take heavy mounting equipment. As a stopgap measure, it was decided that they should be armed with a single aft QF 3-pdr Hotchkiss cannon and several twin Lewis gun pintle mounts, with one on the bow and a pair of mounts amidships. For hunting U-boats, the boats were given ASDIC equipment and depth charge racks, one on each side, capable of carrying up to six depth charges each. Early into service, the boats also received a Holman projector which was mounted amidships. In their first months at war, the Fairmile A's hunted U-boats and protected convoys in British coastal waters.

Throughout their service, The Fairmile A's were plagued by their handling issues and short operating range. By 1941, with the superior Fairmile B motor launches already in service, any surviving Fairmile A's were converted into minelayers, their depth charge racks replaced with mine racks capable of carrying either six bottom mines or nine moored mines. The 3-pdr Hotchkiss was relocated to the bow, a twin 0.5 in Vickers machinegun Mark IV mount added in its place. As minelayers, their funnels were also removed, exhaust rerouted out through the sides instead. In 1943, the Fairmile A's received an upgrade in the form of a single 20 mm Oerlikon cannon in place of the removed funnel and an aft twin 20 mm Oerlikon Mark IX mount. By 1945, the surviving Fairmile A's were converted once again, this time into anti-submarine escorts. As part of this conversion, they received depth charge racks, a Y-gun depth charge thrower, Type 291 radar, and two 2 in rocket flare launchers. After the end of the war, the surviving Fairmile A's were put into reserve and were all eventually sold between 1947 and 1948.

The prototype, ML-100 was the first of the Fairmile A's to be built. She was ordered from Woodnutt & Co. at St Helens on 27th July 1939, laid down on 29th October 1939, and completed on 19th May 1940. From 1940 to 1941, ML-100 was based at HMS Midge, Great Yarmouth and performed anti-submarine escort duties around Grisby. In either late 1941 or early 1942, ML-100 was converted for minelaying operations and was transferred to the 51st ML Flotilla based at HMS Beehive, Felixstowe. She was commanded by the following:

• T/Lt. F.E.R. Merritt, RNZNVR: October 1942 to December 1943
• T/Lt. G.A. Wright, RCNVR: February 1944 to April 1944
• T/S.Lt. J.E. Branch, RNVR: June 1944 to October 1944
• T/Lt. E.C. Mercer, RNVR: March 1945 to July 1945

ML-100 survived the war and was sold in October 1947.

Media

See also

• Fairmile B (ML345)
• MTB-1(1)
• MGB-61

External links

• Coastal Forces Veterans - Boat Database
• unithistories.com - Royal Navy Coastal Forces 1940-1945
• naval-history.net - British vessels lost at sea in World War 2 - MGB, MTB, SGB, ML, etc - originally published in British Vessels Lost at Sea, 1935-45, His Majesty's Stationary Office, 1947

Bibliography

• Gaumont British News. (Producer). & White, W. B. (Director). (1941). THE STORY OF THE FAIRMILE PATROL BOAT [Film]. England: Gaumont British News.
• Konstam, A. (2010). British Motor Gun Boat 1939–45 (pp. 12-15, 40-41). Oxford, England: Osprey Publishing. ISBN 978-1-84908-077-4.
• Lambert, J., & Ross A. (1990). Allied Coastal Forces of World War II Volume 1: Fairmile Designs and U.S. Submarine Chasers (pp. 9-28). London, England: Conway Maritime Press. ISBN 0-85177-519-5.