The Fairmile B motor launch (often abbreviated to 'ML') was a
very numerous class of motor launch produced in kit form by British boat
builder Fairmile Marine, and then assembled and fitted out by numerous
boatyards during the Second World War to meet the Royal Navy's coastal
operation requirements.
Design
While the Type A motor launch had been designed entirely for
Fairmile by architect Norman Hart, the Type B design had come from Bill Holt,
head of the Admiralty's DNC Boat Section. The hard-chine hull of the Type A had
exhibited seakeeping and handling limitations, but Holt's round-bilged design
for the Type B was found to be a far more seaworthy form.
Like all Fairmile boats, production of the Type B was based
on total prefabrication so individual components could be contracted out to
small factories for production and these arranged as kits that would be
delivered in stages to various boatyards for assembly & fitting out on a
'just-in-time' basis. Accordingly, the detailed design work for the Type B was
taken on by Fairmile and modified to suit their kit fabrication principle -
they then also handled production of component parts.
Altogether approximately 650 boats were built between 1940
and 1945. Like the Type As, the Type Bs were initially intended as submarine
chasers, so the boats were fitted with ASDIC (sonar) as standard.
Their main armament initially reflected their anti-submarine
focus, with 12 depth charges, a single QF 3-pounder Hotchkiss gun forward, and
one set of twin 0.303-in Lewis or GO machine guns (frequently increased in
number by the crew); early boats often received a Holman projector amidships. A
common upgrade to gun armament by 1942-43 in many early boats was to add an aft
bandstand mounting for either a 2-pdr Rolls gun or a 20mm Oerlikon cannon. The
specifications given are for the original 1940 British version.
As the war moved on, the vessels were adapted to other roles
and the armament was modified and upgraded such as the replacement of the
3-pounder with one or more 20 mm Oerlikon cannon and removal of the ASDIC dome
for more clearance as minesweepers. Some boats were configured as motor torpedo
boats.
Boats
The Fairmile B type superseded the original Fairmile A type,
which had been designed by Norman Hart.
First Batch (September
1939 Orders)
An initial batch of 24 of these (ML 101 to ML 124) was
ordered by the Admiralty on 22 September 1939 from the Fairmile Marine company,
of which the first eleven (plus the prototype ML 100) were completed to the
Hart design (Fairmile 'A'); the remaining thirteen (ML 112 to ML 124) were
completed to the new Fairmile B design. The first Fairmile B motor launch
(actually ML 113 from Tough Bros, Teddington) was completed and delivered on 12
August 1940, with a further eleven from this first production batch entering
service before the end of the year (the last of the batch to be completed - ML
123 -was delayed until 1941).
Second Batch (January
1940 Orders)
The Admiralty placed a massive order for a second batch of
Fairmile Bs - 120 vessels in total - on 8 January 1940. These were numbered ML
125 to ML 244. Of these, 37 were delivered by the end of 1940 and the other 83
during the first half of 1941.
Third Batch (May 1940
Orders)
An order for a third batch, this time of 65 boats, was placed
on 21 May 1940; these were numbered ML 245 to ML 309, and were all delivered
during 1941, as were two extra units (ML 310 and ML 311) ordered on 28 June
1940 for Singapore to be assembled by the Singapore Harbour Board; this last
pair were delivered to Singapore on 29 November 1941, only to be lost in
February 1942 to the Japanese (who re-used ML 310 under the name Suikei 12).
Fourth Batch (August
1940 Orders)
The fourth batch of 24 boats was ordered on 28 July 1940 as
ML 312 to ML 335. However, these were altered to be completed instead as Motor
Gunboats, re-classed as Fairmile C motor gun boats, and the prefixes to their
numbers changed from "ML" to "MGB", retaining the same
numbers. In their place, a new batch of 50 Fairmile Bs was ordered on 21
August, and these became ML 336 to ML 367 (the last six of these for assembly
by the Singapore Harbour Board) and ML 372 to ML 389.
Six days later another six were ordered, ML 368 and ML 369 to
be built in Bermuda for the Royal Canadian Navy, ML 370 and ML 371 for assembly
in Jamaica for Caribbean service, and ML 390 and ML 391 intended for assembly at
Singapore, although this last pair was switched to Bombay Dockyard on 22
February 1942 following the fall of Singapore.
Later Batches (1941 to
1942 Orders)
Further batches followed, producing ML 392 onwards, many
assembled in Overseas yards, with a final total of about 650 boats of this Type
eventually assembly worldwide, including 60 in Canada.
All boats were essentially the same, although they could be
adapted to serve in several roles by the expedient of having pre-drilled rails
on their decks spaced to allow the fitting of various types of armaments.
Although their armament initially reflected their main anti-submarine mission,
nine of them were fitted with 21-inch (533 mm) torpedo tubes taken from ex-US
Town-class destroyers; they formed the 2nd ML Flotilla tasked with
anti-invasion duty, until the threat had passed.
Service
During the Siege of Malta, they were used to sweep a narrow
channel ahead of heavier minesweepers which widened the channel. The heavier
minesweepers were initially the remnants of the Malta trawler force, then fleet
minesweepers that arrived with a convoy from Gibraltar. The launches were able
to pass over the mines whereas many trawler losses had been caused by the
leading ship hitting a mine.
A number served in the St Nazaire Raid as assault transports,
but their light construction meant that they suffered heavily; 12 B motor
launches were lost in the action, out of 16 deployed.
During the Normandy landings a number of MLs were designated
as navigation launches. These motor launches guided the landing craft onto the
correct beaches. For this task the craft were fitted with splinter mats at the
front for added protection. An Oerlikon 20 mm cannon was fitted amidships and a
Bofors 40 mm gun was installed at the stern. Smoke canister apparatus was
installed at the rear of the craft and the number of depth charges was reduced.
See main picture above of ML303 in this configuration.
Many were built as rescue motor launches with small sickbays
aft of the engine room coaming, and classified as RML (rescue motor launch).
These were numbered in the series RML492 to RML500, and RML511 to RML553.
Several more were converted to use as War Office ambulance launches with larger
sickbays.
British Colonial or
Commonwealth-built Fairmile B Motor Launches
Canadian Built
Fairmiles
Originally designed for the Royal Navy (RN) by W.J. Holt of
the British Admiralty and built by British boat builder Fairmile Marine, during
the Second World War 88 Fairmile B motor launches, with slight modifications
for Canadian climatic and operational conditions, were built in Canada for
service with the RCN in home waters. The first thirty-six Canadian Fairmile B
type were designated and painted up as CML 01-36 (coastal motor launch). Eight
Canadian Fairmiles (Q 392-Q 399) were built by Le Blanc for the RN and were
transferred under Lend-Lease to the US Navy. The US Navy used the
Canadian-built Fairmiles as submarine chasers (SC1466-1473).
Other British Colonial
or Commonwealth Built Fairmiles
At least two (ML 368 and ML 369) were built in the Imperial
fortress colony of Bermuda, home to the base, dockyard and Admiralty house of
the America and West Indies Station, by what was to become Burland, Conyers
& Marirea, Ltd.
New Zealand ordered on 4 September 1941 twelve boats for
assembly from the Fairmile kits by four separate boat builders in Auckland, of
which the first two (MTB 403 and MTB 400) were delivered in October and
November 1942 respectively and the following ten (MTB 401, MTB 402, and MTB 404
to MTB 411) during 1943. These were used in New Zealand waters and around the
Solomon Islands, and included HMNZS Maori and Kahu (ii). All were sold in 1947
except for MTB 411 (which became the Kahu (ii)).
In Australia 35 boats entered service from October 1942. They
were employed on routine patrols, convoy escorts, running special forces in and
out of Japanese-held areas, in Papua New Guinea, boom defense patrols in harbors at home and abroad, courier operations, survey work, and raiding
Japanese-held coasts. Of note the surrender of Japanese forces in the South
West Pacific. On 10 September 1945, Rear-Admiral S. Sato, commanding officer of
Kairiru and Muschu Islands, New Guinea, surrendered the Japanese forces on the
islands to Major-General H. C. H. Robertson, commander of 6th Division on board
the ML 805.
At least six boats (ML380-383,829 and 846) were built by
South Africa and commissioned during November 1942. These were sent as the 49th
Fairmile Flotilla (SANF) to Burma and deployed along the Arakan coast. The
boats saw much action in support of ground forces and disrupting Japanese
supply lines.
The Imperial Japanese Navy salvaged two that had been sunk
and placed them in service.
A number of boats were built in Egypt by Thomas Cook &
Son, who had a Cairo shipyard for constructing Nile tourist craft. Armament was
fitted in Port Said. The first three to enter service in 1942 were MLs 355, 353
and 348. Post war they were often taken on as pleasure boats and a number of
Fairmile Bs are on the National Register of Historic Vessels.
Fourteen Fairmile B were operated by the Italian Guardia di
Finanza naval service, between 1947 and the 1980s.
References
Allied Coastal Forces of World War Two, Volume I : Fairmile
designs and US Submarine Chasers - by John Lambert and Al Ross – 1990.
War at Sea - South African Maritime Operations during World
War II : CJ Harris - 1991
Hudson, G. M. (2001). "Question 52/00: US Army Fairmile
"B" Motor Launches". Warship International. XXXVIII (4): 335.
Fairmile 'B' Class Launches Accessed 28 November 2007
https://uboat.net/allies/warships/ship/14515.html ML347 built
by Risdon Beazley Ltd NR Southampton became Eastern Princess at Great Yarmouth
after the war and last heard of as a ferry in Skiathos