The Moth-class sailboat belongs to the international class of sailboats. It is the fastest single-seater class in the world. A vessel that wants to compete in the Moth class must have a certificate from an International Organization that defines the rules and dimensions of the entire sailboat, which limits design. The equipment of the sailboat includes two hydrofoils – main and stern. Hydrofoils must be defined in accordance with the rules. The paper presents the principle of selection of elements of the main hydrofoil assembly, which includes the foil profile, holder and mechanical angle of incidence regulator. Asymmetric and symmetric foil profiles and hydrofoil holders were considered, which were analyzed with software packages. For the selected foil profile and main hydrofoil holder, the choice of materials, laminate plan and production technology are shown. In conclusion, the advantages and disadvantages of the chosen solutions are commented.