Title: PREDICTED PERFORMANCE AND SEAKEEPING OF THE SEMI-PLANING SHIP
Abstract: The Semi-Planing Ship (SPS) is a new concept of hybrid vessel based on a large asymmetric chined-hull with foils which span between the hulls. A model of the SPS has been built and successfully tank tested. During the tests the foil settings were optimised and a study of the calm water resistance was undertaken. Speeds of up to 50 knots were investigated, at various model weights and running trim angles. The seakeeping characteristics were investigated using a frequency domain computer program which predicts the motions of twin-hulled vessels, taking into account foil lift and viscous damping effects. Vertical acceleration levels at separate points along the hull of the SPS were predicted, together with the incidence of under-deck slamming. Sea states typical of UK waters were assumed, with significant wave heights of up to 7.0m. The results of the tests and computer simulations were compared with similar predictions for a 120m long conventional catamaran. It is shown that the SPS has an improved performance and reduced motions, and is capable of operating at full power in seas up to 5.0m significant wave height, equivalent to gale force conditions in UK coastal waters.
Publication Year: 1995
Publication Date: 1995-01-01
Language: en
Type: article
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