The landing craft mechanized (LCM) is a landing craft designed for carrying vehicles. They came to prominence during the Second World War when they were used to land troops or tanks during Allied amphibious assaults.
There was no single design of LCM used, unlike the landing craft, vehicle, personnel (LCVP) or Landing Craft Assault (LCA) landing craft made by the US and UK respectively. There were several different designs built by the UK and US and by different manufacturers.
The British Motor Landing Craft (MLC) was conceived and tested in the 1920s and was used from 1924 in exercises. Nine were in service at the start of the war. It was the first purpose built tank landing craft. It was the progenitor of all subsequent LCM designs.
LCM 1
The landing craft, mechanised Mark I was an early British model. It was able to be slung under the davits of a liner or on a cargo ship boom with the result that it was limited to a 16-ton tank.
The LCM Mark I was used during the Allied landings in Norway (one alongside the MLCs), and at Dieppe and some 600 were built.
Displacement: 35 tonnes
Length:
Width:
Draught:
Machinery: two Chrysler 100 hp petrol engines
Speed: 7 knots
Crew: 6 men
Armament: two .303 in. Lewis guns
Capacity: one medium tank, or 26.8 tons of cargo or 60 troops
100 men
with of freeboard
LCM (2)
Displacement: 29 tons
Length: 45 ft (14 m)
Beam: 14 ft 1 in (4.3 m)
Draft: 3 ft (0.91 m)
Speed: 8.5 knots (15.7 km/h)
Armament: two .50-cal M2 Browning machine guns
Crew: 4
Capacity; 100 troops, or one 13.5 ton tank, or 15 tons of cargo
The first American LCM design, from the US Navy's Bureau of Construction and Repair. Approximately 150 were built by American Car & Foundry and Higgins Industries.
There were two designs:
Bureau
Capable of carrying of cargo
Higgins
In appearance very similar to the LCVP which Higgins Industries also constructed, with a wide load area at the front and a small armoured (1/4 inch steel) wheelhouse on the aft decking over the engine room. A Higgins LCM-3 is on display at the Battleship Cove maritime museum in Fall River, Massachusetts.
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The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage of its active battle fleet alone exceeding the next 13 navies combined, including 11 allies or partner nations of the United States as of 2012. It has the highest combined battle fleet tonnage (4,635,628 tonnes as of 2019) and the world's largest aircraft carrier fleet, with eleven in service, two new carriers under construction, and five other carriers planned.
Landing Craft Assault (LCA) was a landing craft used extensively in World War II. Its primary purpose was to ferry troops from transport ships to attack enemy-held shores. The craft derived from a prototype designed by John I. Thornycroft Ltd. of Woolston, Hampshire, UK. During the war it was manufactured throughout the United Kingdom in places as various as small boatyards and furniture manufacturers.
The landing craft, tank (LCT) (or tank landing craft, TLC) was an amphibious assault craft for landing tanks on beachheads. They were initially developed by the Royal Navy and later by the United States Navy during World War II in a series of versions. Initially known as the "tank landing craft" (TLC) by the British, they later adopted the U.S. nomenclature "landing craft, tank" (LCT). The United States continued to build LCTs post-war, and used them under different designations in the Korean and Vietnam Wars.