초록 ▼

A wind-propelled hydrofoil comprising a forward assembly with at least partially submerged forward foils and a fully submerged aft foil. The forward foils (43, 44) are such that the resultant of the vertical forces drops when said assembly is translated vertically upwards, with a heave characteristi

A wind-propelled hydrofoil comprising a forward assembly with at least partially submerged forward foils and a fully submerged aft foil. The forward foils (43, 44) are such that the resultant of the vertical forces drops when said assembly is translated vertically upwards, with a heave characteristic (F), and increases when said forward assembly is subject to upward pitching, with an incidence characteristic (A). The aft foil (46) has an incidence characteristic (R) such that R(d-g)-Ag+F(g2+r2)>0, wherein d is the distance between the aft foil (46) and the center of heave, g is the distance between the center of gravity and the center of heave, and r is the gyration radius of the hydrofoil.

대표청구항 ▼

Wind-propelled hydrofoil having a forward assembly including forward foils that are at least partially submerged and a totally submerged aft foil which therefore has no heave characteristic, the forward foils being such that the resultant of the vertical forces, which has a heave characteristic F: d

Wind-propelled hydrofoil having a forward assembly including forward foils that are at least partially submerged and a totally submerged aft foil which therefore has no heave characteristic, the forward foils being such that the resultant of the vertical forces, which has a heave characteristic F: decreases when said forward assembly moves vertically upwards, and increases when said forward assembly is subjected to an upward pitching movement, wherein the forward foil assembly has an incidence characteristic A and the aft foil has an incidence characteristic R characterised in that: (a) in sailing conditions the forward foils have a fixed position and the aft foil has a usually fixed position with respect to the hydrofoil; (b) said forward foils and said aft foil being positioned relative to each other and to the center of gravity of said hydrofoil such that longitudinal stability is provided to said hydrofoil and such that said hydrofoil remains in a state of equilibrium with no control system; (c) the position of said forward foils and said aft foil with respect to the center of gravity providing the hydrofoil with a stability characteristic which satisfies the following equation: R(d-g)-Ag+F(g2+r2)>0 in which d is the horizontal component of the distance between the aft foil and the center of heave of the forward assembly, g is the distance between the center of gravity of the hydrofoil and the center of heave of the forward assembly, and r is the gyration radius of the hydrofoil for pitching movements, whereby the hydrofoil is inherently stable in the longitudinal direction.