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Defender-class boat
The Defender-class boat, also called Response Boat – Small (RB-S) and Response Boat – Homeland Security (RB-HS), is a standard boat introduced by the United States Coast Guard in 2002. The boats serves a variety of missions, including search and rescue, port security and law enforcement duties and replaces a variety of smaller non-standard boats.〔(【引用サイトリンク】 25-Foot Defender Class Boat (RB-HS/RB-S) )〕
The design length of the hull is 25 feet and the boat is officially referred to as such. However, the overall length with engines mounted is approximately . Powered by twin outboard motors, they are capable of speeds in excess of and have a range of 150 to , depending on the class. The boat requires a minimum crew of two persons, but has a carrying capacity for 10 persons. The boat is easily trailerable and can be transported by a C-130 Hercules aircraft or truck.〔http://www.uscg.mil/directives/cim/16000-16999/CIM_16114_37B.pdf CIM 16114.37B Defender Class Operator's Handbook〕
Although similar in appearance to a rigid-hulled inflatable boat, the Defender is actually an aluminum-hulled vessel, equipped with a rigid foam-filled flotation collar. The boats are built by ''SAFE Boats International'' (Secure All-around Flotation Equipped) of Port Orchard, Washington, a vendor of government and law enforcement boats.〔(【引用サイトリンク】 SAFE Boats International )〕〔(【引用サイトリンク】 GSA Sales page for SAFE Boats International )〕
==Design==
The Defender class utilizes a rigid deep-V hull constructed of marine grade aluminum. While similar in appearance to the sponson of a rigid-hulled inflatable boat the Defender's collar is actually made from rigid polyethylene foam. The boat is powered by two outboard engines, usually Honda four-strokes though Mercury and Johnson engines have also been used. Tow bitts are fitted forward and aft which also serve as mounting points for M240B or M60 machine guns.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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