The experimental studies on hydrofoil resistance

This paper presents the hydrofoil resistance model tests which were performed at Ship Design and Research Centre (CTO S.A.). The measurements were carried out in the large towing tank of Ship Hydromechanics Division. A four meters long wooden hydrofoil model was tested. The model was equipped with two lifting foils and a stabilizing front foil. The measurements were conducted for a combination of three values of static trim and two foil angles of attack. A new methodology of shaft angle optimisation with vertical force simulation is presented. The simulation system is an integral extension of the standard dynamometric system for resistance measurements. This paper presents some aspects of the test methodology. The results are briefly presented in the form of standard non-dimensional coefficients in the function of volume Froude number.