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RNLB ''Lloyds II'' (ON 986) was an lifeboat of the Royal National Lifeboat Institution (RNLI)〔 〕 stationed at Sheringham in the English county of Norfolk〔 〕 from 8 October 1990 until April 1992 when she was replaced by the second generation Rigid Inflatable Boat (RIB) ''Manchester Unity of Oddfellows'' in April 1992. During the time that the ''Lloyds II'' was on station at Sheringham, she performed 13 service launches.〔 ==Design and construction== ''Lloyds II'' was built at the yard of Morris and Lorimer at Sandbank, Argyll.〔 〕 She was an Oakley class self-righting design〔 which combined great stability with the ability to self-right in the event of the lifeboat capsizing. This was achieved by a system of shifting water ballast.〔 The system worked by the lifeboat taking on one and half tons of sea water at launching into a tank built into the base of the hull. If the lifeboat then reached a crucial point of capsize the ballast water would transfer through valves to a righting tank built into the port side.〔 If the capsize was to the starboard side of the lifeboat, the water shift started when an angle of 165° was reached.〔 This would push the boat into completing a full 360° roll. If the capsize was to the port side, the water transfer started at 110°. In this case the weight of water combined with the weight of machinery aboard the lifeboat usually managed to stop the roll and allow the lifeboat to bounce back to upright.〔 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「RNLB Lloyds II (ON 986)」の詳細全文を読む スポンサード リンク
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