This project aims to explore the effects of surface finish on the performance of foils from the Olympic class Nacra 17. The study will assess how different finishes influence ventilation and drag across a range of Reynolds numbers that go from transitional to turbulent flow. Tailoring the surface roughness to have an improved performance requires a better understanding of the effect of shape size and area distribution of roughness elements on both the force production and the flow (Vilumbrales-Garcia et al., 2024). By comparing the forces and potential ventilation initiation between the numerical and experimental data, we aim to uncover insights that could enhance sailing efficiency, performance and most importantly safety for the crews aiming at answering a still open scientific question revolving around the surface finish of carbon foils. Furthermore we will assess the life cycle analysis of the foils over time and their structural integrity after use.