Preliminary design of a 22m expedition sailing yacht for charter

The purpose of this student project was to design a 22m expedition sailing yacht for charter, capable of sailing in light ice conditions. Polar areas are extreme destinations \nwhich require both specific design and equipment. The author intended to create a yacht that fulfils the requirements of an expedition vessel while meeting customers’ common demands in terms of sailing, adventure and ecology. \nFirst a parametric study was carried out to determine a design guideline and fix the main characteristics. Then the hull was developed based on the parameters previously \nestablished and the author‘s understanding of naval architecture. The boat had to comply with general needs in terms of accommodation space, sailing capacity and also \nwith minimum stability criteria. \nThe general arrangement was an essential factor of the target design. Practical considerations leaded the interior design, which should be comfortable and sheltered. \nBecause of the yacht program, sail ability and stability were the key words when establishing the sail plan. Likewise low draft appendages were based on practical \nsolutions well used in the nautical industry. \nThe sailing balance was also demonstrated and a velocity prediction was carried out using WinVPP TM. \nFrom a construction point of view, the choice of the hull material was based on the author’s research. Steel was briefly compared to aluminium alloy before determining \nwhich metal was the most suitable. \nScantlings and basic structure were established using Gerr’s method and following the International Standard Organisation (ISO) regulations. \nLooking at ice-class rules and similar expedition vessels, ice capability was taken into \naccount by adding structural reinforcements. \nThe mast, rigging and spreaders design was done using a basic forces resolution. \nSystems and engineering details such as the engine installation and the tank’s position were preliminary designed. \nOnce all the scantlings and the layouts finalised, it was possible to carry out the weight estimation and to finalise the stability calculations.