New correction procedure for shallow-water effects in ship speed trials

To correct ship speed trials for limited shallow-water effects, Lackenby’s method is currently recommended by the ITTC. This method appears to be based on very few and inadequate data. To replace it, a new procedure is proposed. It corrects separately for the effects of shallow water on the different components of ship resistance. These have been identified by computational studies. A simple algorithm is proposed to estimate a power increase for equal speed in shallow water. This new correction method has been applied to dedicated shallow-water trials for two ships and was found to perform much better than Lackenby’s method.

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For more information contact Hoyte Raven.

July 12, 2018
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