In recent years, Turkey has become one of the major shipbuilder countries in the world. Particularly motor yachts that have been designed and built in Turkey have reached world-wide quality and reputation. However, the progress achieved in the design and production procedures has not been matched by the research on hull form development. In general very limited funds are allocated for R&D activities about hull form optimization.

In the scope of this thesis, the variations of vertical acceleration values in waves by the changes in vessel's dimensions are analysed. The vertical acceleration value is the most influential component on the comfort in waves and therefore significantly affects the commercial success of a motor yacht. For the analysis a typical motor yacht designed and built in Turkey is selected as the parent form. The vessel's length is 22,25 m and the breadth 5,811 m. By using this form as the parent form four different variant forms were generated. The lengths of these variant forms vary from 21,75 m to 22,75 m, by 0,25 m increments. Four more variant forms were generated by changing the beradth between 5,411 m and 6,211. The vertical acceleration values of all these forms were calculated by the Seakeeper module of Maxsurf software and the results were compared with each other.