Abstract
A large number of small craft with a demand of high speed are planing vessels (Faltinsen, 2005). Their hulls are designed to plane, a condition, in which the boat's weight is carried mainly by hydrodynamic rather than hydrostatic forces. In order to reach the state of stable planing, planing hulls usually have hard chines, a transom stern and a certain deadrise angle, which is often constant in the aft and becomes larger towards the bow. Smaller deadrise angles are associated with a higher dynamic lift, which is often beneficial for the calm water performance. However, smaller deadrise angles also lead to higher vertical accelerations the crew is exposed to when the boat travels in rough water. To ensure good performance in all operating conditions, a hydrodynamic evaluation of the boat's behaviour both in calm water and in waves is important.
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