Stability analysis and prediction of performance for a hydrofoil sailing boat

Subtitle: Part 2: Dynamic stability analysis

Article type: Research Article

Authors: Masuyama, Yutaka

Affiliations: Kanazawa Institute of Technology, Ishikawa, Japan

Abstract: A dynamic stability analysis for a hydrofoil sailing boat has been carried out on the boat with two surface-piercing dihedral front foils and an inverted ‘T’ rear foil. The small-disturbance theory was applied to the analysis with accounting for the interaction between the longitudinal and lateral motions. Stability derivatives were calculated for the hydrofoils and the sail. As a result of the analysis, it was clarified that there was a critical sailing state for the maximum attainable boat velocity which was lower than that of the conventional predictions for the hydrofoil sailing boat. When the velocity exceeded the maximum velocity determined as the critical sailing state, the boat fell into static instability or divergence.

DOI: 10.3233/ISP-1987-3439001

Journal: International Shipbuilding Progress, vol. 34, no. 390, pp. 20-29, 1987