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45ft 6in Watson-class lifeboat
The 45ft 6in ''Watson''-class was a non self-righting displacement hull lifeboat built between 1926 and 1933 and operated by the Royal National Lifeboat Institution between 1926 and 1972
==History==
The 45ft 6in ''Watson''-class lifeboat marked the transition from single engine, single screw to twin engine, twin screw layout. The first two boats were similar to the last boats, albeit six inches longer due to a forward raked bow. The third boat was the first with twin engines and twin screws while the fourth had twin engines geared to a single screw, a unique layout in RNLI lifeboat history. The twin screw layout proved to be superior and from the fifth boat onwards this was the layout adopted. The 45ft 6in Watsons were long lived and most survived at their original stations into the 1950's when most were replaced by 46ft 9in and, later in the decade, 47ft Watsons. Many boats spent their final years in the reserve fleet with five of the later boats serving until 1969 and one, ON759, continuing in the reserve fleet until 1972. During their service, 45ft 6in Watsons launched on service 2,587 times and are credited with saving 2,613 lives. The single biggest contributor being the Humber lifeboat ''City of Bradford II'' ON 709, which in twenty five years at the station launched on service 228 times, saving 305 lives.
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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