Well-established operational practices have determined the evolution of earlier carriage-launched lifeboats. The requirement of the Royal National Lifeboat Institution (RNLI) that all offshore lifeboats be of the fast, self-righting type by 1993, however, motivated the need to reexamine basic design parameters in the context of current launching and recovery practices and possible improved techniques. Conventional model tests were carried out to establish resistance and propulsion data, but the inability to realistically model carriage launching and recovery dictated the need to build an experimental prototype lifeboat. Extensive evaluation covered not only launch and recovery on the beach, but also the usual range of routine prototype trials and seakeeping investigations for a lifeboat. Trials with the prototype craft exposed problems resulting from the increased performance requirements, problems that would not have been highlighted from normal model testing. Notable amongst these was the tendency to broach and the inability to correct this rapidly by rudder in certain conditions. In addition to describing the comparative results of these aspects of the model and full-scale trials, this paper outlines methods used to improve the overall seakeeping potential of this class of lifeboat. Subsequent satisfactory trials of the preproduction craft led to the implementation of comparative seakeeping trials of the three fast offshore lifeboat classes, namely Arun, Tyne and Mersey. Provisional results are presented for discussion. Methods and materials of construction are evaluated, and the results are described.

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  • Supplemental Notes:
    • Transactions paper
  • Authors:
    • Hudson, F D
  • Publication Date: 1990

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  • Accession Number: 00661760
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM