5.2 Craft speed and operating mode
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1195 – Guidelines for the Conduct of High-speed Craft Model Tests – (2 June 2006) - Annex - Guidelines for Model Testing - 5 Test Procedure - 5.2 Craft speed and operating mode

5.2 Craft speed and operating mode

  5.2.1 Where a craft normally operates in a non-displacement mode, tests should be conducted in both zero speed (displacement mode) and maximum operating forward speed (non-displacement mode). Where a non-displacement mode is tested, any lift devices should be employed as specified in 2.2.1.1.

  5.2.2 Prior to the testing, an estimate should be made by the owner and/or builder as to the maximum speed of the full scale craft into head seas (V W) that would be practically attainable in the specific loading condition (powering considerations) or be structurally permissible (e.g.: by the classification society). Where a craft may be operated in both displacement and non-displacement modes, separate values of V W should be derived for the two modes.

  5.2.3 In head seas the speed of the model should not exceed V W, but may be reduced to not less than 65% of V W, provided that if a reduced speed is necessary to satisfy the terms of the exemption, the maximum permissible speed in the relevant wave height is incorporated in the Permit to Operate and in the craft operating manual.

Parent topic: 5 Test Procedure
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