Predicting the performance of very high speed craft is a particularly challenging task, and often this needs to be done with a smaller budget than that available to the designers of larger conventional craft. The paper discusses the issues associated with predicting: resistance and powering; dynamic instability; seakeeping; and manoeuvring of high speed craft. It is shown that numerical techniques are generally not considered sufficiently accurate for many aspects of high speed craft performance, and that many of the assumptions made when conducting model experiments on conventional vessels, and extrapolating the results to full scale, are not valid for high speed craft.
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