6 Trials Demonstrating Performance in Relation to Operating Limitations
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1329 – Guidelines for Uniform Operating Limitations of High-Speed Craft – (11 June 2009) - Annex – Guidelines for Uniform Operating Limitations of High-Speed Craft - 6 Trials Demonstrating Performance in Relation to Operating Limitations

6 Trials Demonstrating Performance in Relation to Operating Limitations

  6.1 The worst intended conditions of wind and sea may not be available for the conduct of the verification trials required by chapter 17 of the Code, in which case some extrapolation of satisfactory trial results may be necessary. Any extrapolation should take account of the non-linear nature of seakeeping behaviour and of variation in wave period (frequency) and height (amplitude). In such cases, the worst intended conditions specified on the craft’s Permit to Operate should not be more than 130% of the significant wave height in which the verification trials were conducted. Extrapolation of wave period should be conducted separately from wave height. Where satisfactory trials have been completed on a craft, those trials are not required on subsequent identical sister craft, provided the operational envelope of wave height and wave period is not significantly changed. Any extrapolation based on trial results of another closely similar design of similar size (length and breadth both within 5% of that of the craft in question) should be verified through trials of the new craft. Extrapolation is not applicable to trials conducted under section 5.5 of these Guidelines.

  6.2 In order that extrapolation of wave height may be conducted in a consistent manner, a minimum wave period should be associated with each significant wave height used to establish the worst intended conditions.

Parent topic: Annex – Guidelines for Uniform Operating Limitations of High-Speed Craft
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