#shorts U.S. Navy unmanned vessels 🇺🇸
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Unmanned Surface Vessel Transits to RIMPAC 22
The unmanned surface vessels Nomad, front, Sea Hunter, right, and Ranger transit the Pacific Ocean in route to Rim of the Pacific (RIMPAC) 2022. Twenty-six nations, 38 ships, four submarines, more than 170 aircraft and 25,000 personnel are participating in RIMPAC from June 29 to Aug. 4 in and around the Hawaiian Islands and Southern California. The world’s largest international maritime exercise, RIMPAC provides a unique training opportunity while fostering and sustaining cooperative relationships among participants critical to ensuring the safety of sea lanes and security on the world’s oceans. RIMPAC 2022 is the 28th exercise in the series that began in 1971. (U.S. Navy video by Mass Communication Specialist 1st Class Tyler R. Fraser)
Sea Hunter is an autonomous unmanned surface vehicle (USV) launched in 2016 as part of the DARPA Anti-Submarine Warfare Continuous Trail Unmanned Vessel (ACTUV) program.[3] She was christened 7 April 2016 in Portland, Oregon. She was built by Vigor Industrial.[4] The vessel continues the line of experimental "Sea" ships, including Sea Shadow, Sea Fighter, Sea Jet, and Sea Slice.[5] Sea Hunter is classified as a Class III USV and designated the Medium Displacement Unmanned Surface Vehicle (MDUSV).[6]
The initially unarmed prototype, built at a cost of twenty million dollars, is a 132-foot (40 meter)-long trimaran (a central hull with two outriggers). She is an unmanned self-piloting craft with twin screws, powered by two diesel engines with a top speed of 27 knots (31 mph; 50 km/h). Her weight is 135 tons, including 40 tons of fuel, adequate for a 70-day cruise. Cruising range is "transoceanic,"[4] 10,000 nautical miles (12,000 mi; 19,000 km) at 12 knots (14 mph; 22 km/h)[7] fully fueled with 14,000 U.S. gallons (53,000 L) of diesel, enough "to go from San Diego to Guam and back to Pearl Harbor on a tank of gas."[8] Sea Hunter has a full load displacement of 145 tons and is intended to be operational through Sea State 5, waves up to 6.5 ft (2.0 m) high and winds up to 21 knots (24 mph; 39 km/h), and survivable through Sea State 7, seas up to 20 ft (6.1 m) high.[9] The trimaran hull provides increased stability without requiring a weighted keel, giving her a higher capacity for linear trajectories and better operations in shallow waters, though the greater width decreases maneuverability.[6]
A removable operator control station is installed during the testing period "for safety and backup" until it can be determined to reliably operate on her own. Operationally, computers will drive and control the ship, with a human always observing and taking charge if necessary in a concept called Sparse Supervisory Control, meaning a person is in control, but not "joy sticking" the vessel around.[9] The system can patrol without human guidance, using optical guidance and radar to avoid hitting obstacles or other watercraft.[10] The ship has a host of non-standard features because of her lack of crew, including an internal layout that offers enough room for maintenance to be performed but not for any people to be permanently present.[5] She is fitted with quicKutter shaft protection rope/line cutters from Quickwater Marine in Perth; these devices protect the vessel from damage caused by rope or net caught by the propellers, without affecting the vessel's performance.
The craft is expected to undergo two years of testing before being placed in service with the U.S. Navy. If tests are successful, future craft of this type may be armed and used for anti-submarine and counter-mine duties, operating at a cost of $15,000-20,000 per day, a fraction of the cost of a destroyer at $700,000 per day (in 2015, equivalent to $800,239 in 2021);[10][11] she could operate with Littoral Combat Ships, becoming an extension of the LCS ASW module.[9] Deputy U.S.
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