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MOTOR YACHT HULL FORM DESIGN FOR THE DISPLACEMENT TO SEMI-DISPLACEMENT SPEED RANGE

MOTOR YACHT HULL FORM DESIGN FOR THE DISPLACEMENT TO SEMI-DISPLACEMENT SPEED RANGE,Perry van Oossanen,Justus Heimann,Juryk Henrichs,Karsten Hochkirch

MOTOR YACHT HULL FORM DESIGN FOR THE DISPLACEMENT TO SEMI-DISPLACEMENT SPEED RANGE  
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Nowadays, the design of luxury motor yachts is focussed on ever higher speeds. Froude numbers between 0.6 and 0.8 are no longer an exception. The typical load profile of a motor yacht often consists of long range cruising at low speeds and only short periods of time at higher and maximum speeds. This indicates the need for focussing hull design over the entire speed range rather than on maximum speed only. For this purpose the concept of the Fast Displacement Hull Form (FDHF) is introduced. The concept and the use of design features that have a large effect on the resistance over the speed range, such as the area of the immersed transom, bulbous bows, trim control and spray rails are discussed. A design methodology using a formal optimization method for the bulbous bow is described and it is shown that bulbous bows are also effective in the semi-displacement speed range. A comparison of the FDHF concept, in terms of resistance, with model tests of displacement and semi- displacement motor yachts, shows a significant resistance improvement over the entire speed range, but especially at displacement speeds when comparing to semi-displacement hull forms. Issues such as stability, interior space and building cost are addressed.
Published in 2009.
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