ABSTRACT
This report is concentrated mainly on investigation and questionnaire on the accuracy of these methods used in powerboat design for the aim prediction and estimation of resistance values. The work contains a brief timeline on the historical development background of powerboats and emphasizes the processes of the four methods: Savitsky, Radojcic, Blount- Fox, Lahtiharju and Wyman. After detailed research, the focus of the work expands to the inquiry part where a planing hull boat is used as an experiment device and all obtained data is summerized by comparing the result from each method with others’. The objective of the work is to make an evaluation on some of these methods and identify the intervals where each of these methods seem to be the suitable coherent tool for the preliminary design of powerboats.