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DARPA Captive Air Amphibious Transporter : ウィキペディア英語版
DARPA Captive Air Amphibious Transporter

The Captive Air Amphibious Transporter (CAAT) is a 1:5 scale〔Faleiro, Shawn. "(DARPA Captive Air Amphibious Transporters )" ''GadgetGain'', 11 August 2012. Retrieved: 3 September 2012.〕 tracked amphibious vehicle prototype being developed by DARPA. It drives on the water with air-filled pontoons attached to the tracks, and is intended to demonstrate how to transport standard 20- or 40-foot containers〔Alvarez, Edgar. "(DARPA's Captive Air Amphibious Transporter can drive on water, help during disaster relief )" ''Engadget'', 11 August 2012. Retrieved: 3 September 2012.〕 from ordinary container ships to shore without using a harbor. DARPA is investigating its usefulness in disasters so that commercial shipping can relieve military ships to focus on military tasks. The CAAT is one of four elements in the Tactically Expandable Maritime Platform (TEMP) program; the others being a containerized living quarter, a stabilized crane, and an unmanned powered parachute delivering containers by air.〔"(DARPA develops technologies for aiding disaster relief )" ''DARPA'', 26 June 2012. Retrieved: 3 September 2012.〕〔Littlefield, Scott. "(Tactically Expandable Maritime Platform (TEMP) )" ''DARPA''. Retrieved: 3 September 2012.〕
==UHAC==

The Marine Corps Warfighting Laboratory is using the CAAT's air-filled track system in its Ultra Heavy-Lift Amphibious Connector (UHAC) concept. The objective is to develop a new amphibious connector to transport U.S. Marine Corps vehicles from ship to shore in heavier loads and over shore obstacles. A half-scale demonstrator was used during RIMPAC 2014, where it was loaded with an Internally Transportable Vehicle, launched from the USS Rushmore (LSD-47), then paddled to shore. The demonstrator was 42 ft (13 m) long, 26 ft (8 m) wide, 17 ft (5 m) high, weighed 38 tons, and traveled at 4-5 knots on water; the hull was made of aluminum, with a small pilothouse mounted on the bow. Using track feet fitted with dense air-impregnated foam blocks make it buoyant in the water and propel it on land, allowing it to traverse through mud, sand, and marshland when ashore. This made the demonstrator's ground pressure about 1 PSI, compared to 9.7 PSI for the Amphibious Assault Vehicle. The full-size UHAC is planned to be long and up to high. The UHAC is primarily aimed at potentially replacing the Landing Craft Air Cushion hovercraft, but it could also supplement it and replace the Landing Craft Utility. Compared to the LCAC, the UHAC is planned to have a heavier payload of 150 tons (standard) to 190 tons (overload) compared to 65 tons, a longer range of compared to , has the advantage of using its tracks to move inland from the beach and over sea walls, and is estimated to cost less than half as much to build and maintain per unit; the LCAC has a faster water speed of over 30 knots compared to 20 knots for the UHAC, and a smaller area of compared to . The UHAC would be faster on water than the AAV and could even transport them to get closer to shore, or carry up to three M1 Abrams tanks. A production version would be survivable with a lower profile, armor, and armament. The concept for the UHAC began in 2008 with the goal to design an amphibious vehicle with low PSI. The Office of Naval Research accepted the design from Navatek Inc., and three prototypes have been constructed since (a one-fifth scale model, a one-quarter scale model, and the half-scale model). Currently, the UHAC effort is a collaborative effort between the U.S. ONR and the Singapore Ministry of Defense Science and Technology department. No decision has been made on taking the final steps necessary to produce the full-scale version.〔(Marine Corps Warfighting Lab assesses potential landing craft replacement ) - MarineCorpstimes.com, 18 March 2014〕〔(Ultra Heavy-lift Amphibious Connector (UHAC) at RIMPAC ) - Defensemedianetwork.com, 15 July 2014〕〔(US Marines demonstrate Ultra Heavy-lift Amphibious Connector prototype ) - Gizmag.com, 16 July 2014〕〔(Marines Test Heavy Duty Landing Craft Prototype at RIMPAC ) - News.USNI.org, 16 July 2014〕

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