Fairmile D motor torpedo boat

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The Fairmile D motor gun boat MGB 606
Class overview
Name	Fairmile D motor gun boat
Preceded by	Fairmile C motor gun boat
Planned	229
Completed	228
Cancelled	1
General characteristics
Displacement	As MTB 102 long tons (104 t) standard 118 long tons (120 t) full load As MGB 90 long tons (91 t) standard 107 long tons (109 t) full load
Length	115 ft (35 m)
Beam	20 ft 10 in (6.35 m)
Draught	4 ft 9 in (1.45 m) to 4 ft 11 in (1.50 m) mean deep load
Propulsion	4 × Packard 4M 2500 petrol engines, total 5,000 hp (3,728 kW)
Speed	29 knots (54 km/h; 33 mph) at full load
Range	506 nmi (937 km; 582 mi) at max revolutions 2,000 nmi (3,700 km; 2,300 mi) at 11 kn (20 km/h; 13 mph)
Complement	21
Armament	2 × single 6 pounder guns 4 × 20mm Oerlikon (2 × single, 1 × twin) 2 × twin .303 Vickers K machine guns 4 × light boat depth charges Searchlight TSA smoke generator
Notes	Armament for gunboat configuration as fitted to MGB 658 by the end of the war. Specifications from Conway's All the World's Fighting Ships 1922–1946. and Motor Gunboat 658

The Fairmile D motor torpedo boat was a type of British motor torpedo boat (MTB) and motor gunboat (MGB),^[1] conceived by entrepreneur Noel Macklin of Fairmile Marine and designed by naval architect Bill Holt for the Royal Navy. Nicknamed "Dog Boats", they were designed to be assembled in kit form mass-produced by the Fairmile organisation and assembled at dozens of small boatbuilding yards around Britain, to combat the known advantages of the German E-boats over previous British coastal craft designs. At 115 feet in length, they were bigger than earlier MTB or motor gunboat (MGB) designs (which were typically around 70 feet) but slower, at 30 knots compared to 40 knots.