Van Oossanen has developed and optimized the patented ‘Fast Displacement Hull Form’ or FDHF. The development of this concept was triggered by the desire to develop a hull form that is efficient over the entire speed range and not only in a restricted speed interval around the maximum speed. The FDHF performs better than conventional displacement and semi-displacement type hull forms at all speeds up to full ‘planing’ speeds. At semi-displacement speeds, the resistance values displayed by the FDHF are 15 to 20 per cent better than those of well-designed hard chine hull forms.
The great ‘green’ benefit is that ships that do not always sail at top-speed (like patrol vessels or yachts) have a much lighter fuel consumption at medium speed. Next to that, this hull needs lower installed power for a given speed, which translates directly into lower building costs. Noise and vibration will be reduced by the smaller installed propulsion power. Other benefits include significantly increased comfort onboard with improved sea keeping behaviour and maneuverability. In addition, the ship or yacht will be comfortable at all speeds. The traditional ‘resistance hump’ of which especially hard chine hulls suffer from when changing from displacement to semi-displacement speeds, is dissolved.
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