Marine Design, 3-4 September 2014, Coventry, UK from commercial and naval ship design where the


requirements are clear. Thus, yacht design often turns out to be a research and development project where the research itself is aimed at study of Customer’s ‘declared’ and ‘real’ needs and their possible variations, and often the result of design is uncertain at early stages. The art of yacht designer is exactly in finding this balance of needs and farseeing possible fluctuations of Customer’s plans.


In terms of naval architecture, this means that the design margins should be kept and the craft should not be drawn on a limit. Say, weight schedule,


available volume


displacement and installed power should cover last minute wishes of the customer for Jacuzzi or extra fuel tanks for ‘new cruising horizons’.


On other side, also different from commercial and naval craft, where delivery criteria are also very clear, the main criterion for yacht is satisfaction of customer and this is the measure of design success. Thus, development of a custom yacht is an interesting creative exercise where all – designer, customer and builder are the parties.


The design is not just making ‘edgy’ images. The design of yacht is a solution of particular task of creating an object with desired esthetical, technical and economical parameters [4]. In our practice the scope of issues to be solved during yacht design process is presented as a ‘design flower’ (fig.3). This means that engineering team should participate in design – from sketches, substantiations of hull main dimensions and definition of craft’s layout


(fig.4-6). Early design directions of optimum or simply unsafe in parameters.


 The Concept design stage includes rendered images, preliminary drawings of general arrangement, lines plan, preliminary calculations and specifications. The Concept answers the questions ‘how does the boat look?, ‘is it feasible?’ and provides information required for preliminary cost estimates


 Technical design – detailed engineering drawings and calculations certification;


 Workshop drawings – used for construction, cutting files and other detailed drawings;


 Production and post-production - prototyping, supervision, testing.


For the particular project of H65 that is a highly custom yacht designed on unique catamaran platform, all


above considerations have been amplified. 3.


DESIGN REQUIREMENTS AND PRELIMINARY STUDY


The brief for the new design formulated together with customer included:


© 2014: The Royal Institution of Naval Architects the required for construction and


concept, with subsequent presenting and approval of this concept by the customer often results craft that is far from


 55-65’ catamaran for cruising in tropics including ocean passages, can be operated by couple plus one crew;


 Solar-assisted concept - use of solar panels for domestic loads including limited use of air- conditioning;


 Capable to stand aground at propellers;


low tide, protected


 Luxury accommodation without squeezing things inside; condo-level with plenty of headroom and airflow;


 Ample party space for picnics in marina and during day trips;


 Four cabins with luxury finish; one of them can be used as crew cabin;


 Hull material – composite;  Designed to CE/RCD A/B category;


the


Figure 5: Effect of hull spacing on catamaran resistance using Molland’s method [2].


operational


Careful pre-design study of boat’s parameters was made in terms of dimensions, weight, speed and power. On fig.5 resistance is studied depending on demihull spacing showing that


at cruising speeds of 10-12kts wider


catamaran is more advantageous. Detailed discussion of catamaran design parameters and recommendations is presented in [3].


Hull shape of H65 is ‘canoe bottom with stern platform’ – for efficiency at both displacement and semi-planning speeds. This type of shape gives excellent protection of propeller and allows standing aground at low tide.


4. EXTERIOR STYLING


The H65 is an expedition craft for the private owner who wants to live on board in South East Asian or Caribbean tropics, visiting


nearest islands and sometimes


performing long ocean passages. Thus, specific features are included aimed at minimization of direct sunlight in interior spaces, extensive roof protecting flybridge and aft deck. Roofs, tents and shades should be developed at initial stages, otherwise they will be added later by operator and cause visual disharmony. The same refers to opening windows, masts, davits, etc. – those should not


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