Fairmile B motor launch

The Fairmile B motor launch (often abbreviated to 'ML') was a very numerous class of motor launch produced in kit form by British boatbuilder 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.

The Canadian Fairmile B motor launch ML-Q056 in 1941
Class overview
NameFairmile B motor launch
Preceded byFairmile A motor launch
Succeeded byFairmile C motor gun boat
Completedc.650
General characteristics
Displacement85 tons
Length112 ft (34 m)
Beam
  • 18 ft 3 in (5.56 m)
  • except Canadian built at 17 ft (5.2 m) or 17 ft 10 in (5.44 m)
Draught4 ft 10 in (1.47 m)
PropulsionTwo 650 bhp (480 kW) Hall-Scott Defender petrol engines
Speed20 knots (37 km/h; 23 mph)
Range1,500 mi (1,300 nmi; 2,400 km) at 12 kn (22 km/h; 14 mph)
Complement16 (later increased)
Sensors and
processing systems
ASDIC
Armament
  • (for 1940 Sub Chaser)
  • 1 × QF 3-pounder Hotchkiss
  • 1 × twin 0.303 in machine guns
  • 12 depth charges
  • later(some vessels):
  • 1 × QF 3-pounder Hotchkiss
  • 2 × twin 0.303 in machine guns
  • 1 × Oerlikon 20 mm cannon
  • 1 × Bofors 40 mm gun
ArmourWheelhouse plated
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