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The 47-foot MLB is the standard lifeboat of the United States Coast Guard (USCG). The 47′ MLB is the successor to the 44′ MLB.〔(Coast Guard bids adieu to 44-foot boat - Local News Updates - The Boston Globe )〕 At Station Chatham where the new 47-foot boat would draw too much to get over the bar, the 42-foot Near Shore Lifeboat was designed to replace the 44' MLB. 〔 (COAST GUARD COMPASS OFFICIAL BLOG OF THE U.S. COAST GUARD )〕 The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to , breaking surf up to 6 m and impacts up to three G's.〔 If the boat should capsize, it self-rights in less than ten seconds with all equipment fully functional.〔 The boat's hull and superstructure are constructed entirely from 5456 marine grade aluminum.〔 Designed with a hard chined deep "V" planing hull,〔(Operational Logistics Support Plan (OLSP) for the 47' Motor Lifeboat (MLB) )〕 the 47' MLB exceeds its displacement speed. The frame is composed of 17 vertical bulkhead frames, each of which is welded to the deck and hull, and five of which are watertight.〔 Employing cruise-by-wire control systems,〔(Textron Marine MLB datasheet )〕 the boat can be operated from four different locations: two from the enclosed bridge, and two amidships from an open bridge.〔 Situated less than above the water line are recessed retrieval wells,〔 allowing for easier recovery of persons and jetsam, and easier boardings.〔 A watertight survivor's compartment is equipped for comprehensive first aid.〔 It is situated at the combined center of rotation of the ship.〔 == See also == *Cape-class motor lifeboat (the 47′ MLB in service with the Canadian Coast Guard) *Response Boat – Medium *44-foot Motor Lifeboat *41-foot Utility Boat, Large *Trent-class lifeboat (RNLI lifeboat of similar size and performance.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「47-foot Motor Lifeboat」の詳細全文を読む スポンサード リンク
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