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They are currently used by governments and private organizations throughout the world. The acronym stands for "Landing Craft Mechanized, Mark 8". The vessel weighs , pounds 61, kg and has a crew of four: a Boatswain's Mate petty officer, an Engineman petty officer, a non-rated fireman, and a seaman. US Army specifications call for a crew of six during hour operations: two coxswains , two seamen and two enginemen.
The LCM-8s are constructed from welded steel and powered by four 6V71 or two 12V71 diesel engines , twin propellers, and rudders. The ship can carry 60 short tons of cargo. It was designed by Marinett Marine Corp Dimensions. It has a range of miles at 9kts with a full load. A modified version, the Zippo boat , carries flamethrowers.
There is also another version with an aluminum hull. This version was carried aboard all of the Charleston class LKA ships, as the steel version was too heavy to be lifted by the ship's 40 ton fore and aft booms, preventing more than two from being lowered via the two 70 ton fore and aft cargo booms at one time.
They are now mostly carried by pre-positioned ships. PBR main propulsion jet pumps were easily damaged by ocean salt water which necessitated the boats being carried by another craft to their duty stations. These transport LCMs were classed as mini-docks and each had a boat ramp in the well deck.
The voids built-in float chambers under the well deck would be systematically flooded, allowing the front end of the craft to sink, so a PBR could be floated in or out of the well deck. The pumping mechanism would then be reversed to clear the water out of the voids, restoring the craft to the normal floating position.
A fourth modification was the Army Version for Vietnam Rivers Logistic with a liveaboard cabin and crewed by 6 men consisting of Coxswain, Assist. Coxswain, Engineer and assistant and two deckhands. All crew could handle the two 50 Caliber Machine gun turrets and other small arms and were frequently engaged by the Vietcong on the rivers and canals of the Mekong Delta.
One unit, an Army Reserve Unit out of St. Petersburg, Florida, was called to active duty in received a Unit Commendation of merit for delivering record tonnage in their month tour. During the Vietnam War, there were two new aluminum LCM-8s on Johnston Island, which carried trucks and cargo between islands, and one being used as a rescue boat. They had the newer fluid shift transmissions, and 's paired up to two props. Navy boats, the senior rate was usually a third-class petty officer or above, and the two crewmen could be E-2, E-3 or E-4 ranks i.
The LCM-8s there all had two sets of the twin Detroits paired up to a hydro transmission. Two air compressors , port and starboard of the engine sets, provided air pressure to operate the air cylinders that raised and lowered the bow ramp.
The air cylinders were below deck in the eighth void from the bow and stretched cables attached to the ramp to raise it. Lowering the ramp was accomplished by releasing the air and allowing gravity to bring the ramp down. Some are currently deployed aboard Maritime Prepositioning ships to facilitate their mission of being able to unload all their cargo while still offshore with no outside assistance. The U. Two dozen boats are planned that will be larger and faster, with a longer range and twice the capacity over Mike Boats.
The MSV L will be roughly feet 30 m long, with a draft of less than four feet, a speed of 18 knots and the capacity to carry either an M1 Abrams tank, two Strykers with add-on armor, or four Joint Light Tactical Vehicles.
It also may Marine Aluminium Boats Youtube be used in defended waters, being fitted with a subsurface surveillance device, protection from small arms fire, two Common Remotely Operated Weapon Stations , and mitigated detection through reduction of thermal and acoustic signature.
Testing of the new vessel is to take place until The modification of the vessels included an extended enclosed wheelhouse with full galley facilities, chart table and storage space to aid in extended operations beyond the original design parameters. A water purification system allows the vessels to be somewhat independent for longer periods of time. A fully functioning toilet head and shower are also installed as part of the wheelhouse extensions; external provision for bedding is also included for the full crew complement.
The extension of the wheelhouse increased rigidity of the craft leading to excessive vibration and cavitation with the original three-blade propeller. Further development included a more balanced and expensive five-blade propeller, negating the vibration and cavitation of the original.
The prop change found a few negative effects in the beaching performance of the vessel but over time tactics have been changed to suit the new system. The vessels are also installed with a full suite of electronics allowing the craft to navigate in all weather, day or night in military operations anywhere in the world with little to no special training requirements for an indefinite period.
During the mids, the Army LCM-8 received a life of type extension with a re-engine program. The original twin-pac two-stroke Detroit Diesel engines and Allison mechanical transmissions were replaced with 8v Silver Series Detroit Diesel engines and Allison Hydraulic Transmissions thus extending the life of the craft for another 20 years. Two craft were utilized during the invasion of Iraq in , patrolling the shallow waters of the Khawr Abd Allah estuary using HMAS Kanimbla as their base of operations.
They were extensively used in East Timor for logistic operations in direct support of multinational peace keepers. Other deployments include peacekeeping and peace monitoring operations in Bougainville and the Solomon Islands. The LCM-8 fleet of fifteen was to be replaced by six Australian designed type LCM waterjet propelled craft, however these craft were scrapped, after not meeting the required in-service specifications and being deemed not fit for use for the intended Kanimbla -class.
From Wikipedia, the free encyclopedia. LCM-8 in March Archived from the original on 10 April Retrieved 26 August Smithsonian Magazine. February Archived from the original on Another type of boat carried a flamethrower that could shoot a stream of burning liquid several hundred yards. These boats Navy Engineering Bulletin. Royal Australian Navy 10 : 56� Archived from the original PDF on Townsville Bulletin. Archived from the original on 30 December Australian Army Transport Journal 46 : 83� Retrieved 26 November Army: The Soldiers' Newspaper ed.
Canberra, Australia: Department of Defence. ISSN Australian Defence Magazine. Retrieved 4 February Hidden categories: Wikipedia articles needing clarification from February All articles with unsourced statements Articles with unsourced statements from December Commons category link is on Wikidata All articles with dead external links Articles with dead external links from November Articles with permanently dead external links.
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