A motor torpedo boat is a fast torpedo boat, especially of the mid 20th century. The motor in the designation originally referred to their use of petrol engines, typically marinised aircraft engines or their derivatives, which distinguished them from other naval craft of the era, including other torpedo boats, that used steam turbines or reciprocating steam engines. Later, diesel-powered torpedo boats appeared, in turn or retroactively referred to as "motor torpedo boats" for their internal combustion engines, as distinct from steam powered reciprocating or turbine propulsion.
A submarine chaser or subchaser is a small naval vessel that is specifically intended for anti-submarine warfare. Many of the American submarine chasers used in World War I found their way to Allied nations by way of Lend-Lease in World War II.
The motor gun boat (MGB) was a small, high-speed British military vessel of the Second World War, which was armed with a mix of guns, in contrast to the physically similar motor torpedo boat (MTB), whose main offensive weapon were torpedoes. The small size of the MGBs, and their high speed, made them difficult targets for German E-boats, though, like their opponents, they were limited by heavy weather, because they did not provide a stable-enough platform to aim the guns. The large number of guns meant the crew was relatively large, numbering as high as thirty men on the largest boats.
A Motor Launch (ML) is a small military vessel in Royal Navy service. It was designed for harbour defence and submarine chasing or for armed high-speed air-sea rescue. Some vessels for water police service are also known as motor launches.
The Brave-class fast patrol boats were a class of two gas turbine motor torpedo boats (MTBs) that were the last of their type for the Royal Navy (RN) Coastal Forces division. They formed the basis for a series of simpler boats which were widely built for export.
The Fairmile C motor gun boat was a type of motor gunboat designed by Norman Hart of Fairmile Marine for the Royal Navy. An intermediate design, twenty-four boats were built in 1941 receiving the designations MGB 312–335.
The Fairmile D motor torpedo boat was a type of British motor torpedo boat (MTB) and motor gunboat (MGB) designed by Bill Holt and conceived by Fairmile Marine for the Royal Navy. Nicknamed "Dog Boats", they were designed to combat the known advantages of the German E-boats over previous British coastal craft designs. They were bigger than earlier MTB or motor gunboat (MGB) designs but slower, at 30 knots compared to 40 knots.
Coastal Forces was a division of the Royal Navy initially established during World War I, and then again in World War II under the command of Rear-Admiral, Coastal Forces. It remained active until the last minesweepers to wear the "HM Coastal Forces" cap tally were taken out of reserve in 1968. On 21 May 2020, Ministerial approval for the change in name from 1st Patrol Boat Squadron to Coastal Forces Squadron was given. It encompasses the Archer-class patrol vessels and the Batch 1 River-class offshore patrol vessels and are responsible for UKEEZ Protection and Patrol.
Steam gun boats (SGBs) were small Royal Navy vessels built from 1940 to 1942 for Coastal Forces during the Second World War. The class consisted of nine steam-powered torpedo boats.
Coastal Motor Boat was a small high-speed British torpedo boat used by the Royal Navy in the First World War and up to end of the Second World War.
HM Motor Gun Boat 2007 was a motor gunboat operated by Royal Navy Coastal Forces during the Second World War. She was initially built as one of eight gunboats ordered by the Turkish Navy, but which went on to see service in the North Sea as fast blockade runners. She was initially classed as the merchant vessel Gay Corsair, crewed by men of the merchant navy and sailing under the red ensign. She became HM Motor Gunboat 507 after being acquired by the Royal Navy, and finally HM Motor Gun Boat 2007. She was wrecked under this name in 1945.
Gay Viking was a blockade runner of the British Merchant Navy. Originally under construction as a Motor Gun Boat, Gay Viking was one of eight vessels that were ordered by the Turkish Navy, but were requisitioned by the Royal Navy to serve with Coastal Forces during the Second World War. Originally intended to be HMMGB 506, the vessel was instead completed as a blockade runner for the Merchant Navy and named Gay Viking. She operated out of Hull on two separate operations to the Scandinavian countries. She was one of the more successful of her group, but was lost in a collision while returning from one of these operations. Reports indicate that she may have been salvaged after this and gone on to sail for a considerable number of years as a civilian vessel.
The Dark class, or Admiralty "Type A", were a class of eighteen fast patrol boats that served with the United Kingdom's Royal Navy starting in 1954. All were named with a prefix of 'Dark'. The class could be fitted as either motor gun boats or motor torpedo boats, depending on the type of armament carried. They were the only diesel engined fast patrol boats in the Royal Navy. The class was fitted with the Napier Deltic two-stroke diesel engine. This was of unique layout, an opposed-piston engine with a triangular layout of three banks, 18 cylinders in total.
HMS Albrighton was a Type III Hunt-class destroyer built for the British Royal Navy. She entered service in February 1942, first carrying out an attack on German ships in the English Channel then taking part in the Dieppe Raid, rescuing survivors from the sinking destroyer HMS Broke. Albrighton was next assigned to search for and destroy the German auxiliary cruiser Komet, then escorted a convoy to Gibraltar in prevision of the Allied landings in North Africa. Between December 1942 and April 1943, she participated in the sinking of three more Axis ships with the First Destroyer Flotilla. During the Normandy Landings in June 1944, Albrighton served as a headquarters ship, then sank two German trawlers in the weeks after the invasion. After being converted to a destroyer in early 1945, she was damaged in a collision with a Landing Ship, then was assigned to the British Eastern Fleet. However, the war ended before she was deployed and Albrighton went into reserve.
The Orjen class of eight motor torpedo boats was built for the Royal Yugoslav Navy between 1936 and 1939 at the Lürssen Shipyard at Vegesack, Germany. They were based on the German S-2 motor torpedo boats. At the start of the Axis invasion of Yugoslavia, two boats managed to escape to Alexandria in Egypt where they continued serving with Allied forces, including in operations against Vichy French forces in Syria. The remaining ones were captured by Italian forces and commissioned in the Regia Marina with modified armament; they were also used by the Italians as the model for the Italian-built CRDA 60 t motor torpedo boats.
The Uskok class was a class of two motor torpedo boats built for the Royal Yugoslav Navy during the late 1920s. Named Uskok and Četnik, the boats were built by the Thornycroft Company based on their existing class of 17-metre-long (55 ft) Coastal Motor Boats, but were almost 1.5 metres (5 ft) longer. As their main armament they were equipped with cradles that carried two British-designed 456-millimetre (18 in) torpedoes, were fitted with hydrophones, and could carry depth charges instead of torpedoes if used in an anti-submarine role. The boats were lightly-built using mahogany, powered by two petrol engines, but lacked transverse bulkheads within the hull to mitigate leaks.
T7 was a sea-going torpedo boat operated by the Royal Yugoslav Navy between 1921 and 1941, after spending World War I in Austro-Hungarian Navy service. Originally 96 F, she was a 250t-class torpedo boat, and saw active service during World War I, performing convoy, patrol, escort and minesweeping tasks, and anti-submarine operations. Following Austria-Hungary's defeat in 1918, 96 F was allocated to the Navy of the Kingdom of Serbs, Croats and Slovenes, which later became the Royal Yugoslav Navy, and was renamed T7. At the time, she and the seven other 250t-class boats were the only modern sea-going vessels of the fledgling maritime force.
T8 was a sea-going torpedo boat that was operated by the Royal Yugoslav Navy between 1921 and 1941, after spending World War I in Austro-Hungarian Navy service. Originally 97 F, she was a 250t-class torpedo boat, which saw active service during World War I, performing convoy, patrol, escort and minesweeping tasks, and anti-submarine operations. Following Austria-Hungary's defeat in 1918, 97 F was allocated to the Navy of the Kingdom of Serbs, Croats and Slovenes, which later became the Royal Yugoslav Navy, and was renamed T8. At the time, she and the seven other 250t-class boats were the only modern sea-going vessels of the fledgling maritime force.
HMS Talybont was a Type III Hunt-class escort destroyer who served in the Royal Navy. She was launched in February 1943 and completed in May that year, serving for the rest of the Second World War. She took part in the Normandy Landings in June 1944, supporting the landings at Omaha Beach and the Pointe du Hoc. Post war she served in the Mediterranean before being reduced to reserve at the end of 1947. She was sold for scrap in 1961, with disposal completed by 1962.
HMS Cottesmore was a Hunt-class destroyer of the British Royal Navy. The ship was built by the Scottish shipbuilder Yarrow at their Scotstoun, Glasgow shipyard in 1939–1940, being launched on 5 September 1940 and commissioning on 29 December that year.
United Kingdom 
