A catamaran sailing vessel comprising: two buoyant hulls extending along longitudinal axes of the hulls, the hulls being connected to each other; a trunk connected to the hulls , the trunk including a vertical sleeve and being located inboard of both hulls ; a first hydrofoil structure connected to the hulls and including a first hydrofoil member oriented transverse to the hulls , wherein the first hydrofoil structure includes a daggerboard that is movably mounted in the vertical sleeve and is configured to move up and down within the sleeve and the first hydrofoil member is oriented transverse to the longitudinal axes of the hulls , wherein the first hydrofoil member is movably coupled to the hulls , through vertical motion of the daggerboard , between a first position above a resting waterline of the hulls , and a second position below a lowest extent of the hulls , and wherein, when the first hydrofoil member is in the second position, a configuration of the first hydrofoil member is adjustable to vary an amount of lifting force generated by the first hydrofoil member when the hulls move forward through water when the first hydrofoil member is in the second position, and wherein, when the first hydrofoil member is in the second position, the first hydrofoil member is configured to generate a lifting force when the hulls move forward through water at a speed of less than seven meters per second, wherein the generated lifting force, when combined with lifting forces of other hydrofoils of the sailing vessel, is sufficient to lift both hulls above the surface of the water; and a mast configured to support a sail, wherein the first hydrofoil structure is mounted forward of the mast . two buoyant hulls extending along longitudinal axes of the hulls, the hulls being connected to each other; a trunk connected to the hulls , the trunk including a vertical sleeve and being located inboard of both hulls ; a first hydrofoil structure connected to the hulls and including a first hydrofoil member oriented transverse to the hulls , wherein the first hydrofoil structure includes a daggerboard that is movably mounted in the vertical sleeve and is configured to move up and down within the sleeve and the first hydrofoil member is oriented transverse to the longitudinal axes of the hulls , wherein the first hydrofoil member is movably coupled to the hulls , through vertical motion of the daggerboard , between a first position above a resting waterline of the hulls , and a second position below a lowest extent of the hulls , and wherein, when the first hydrofoil member is in the second position, a configuration of the first hydrofoil member is adjustable to vary an amount of lifting force generated by the first hydrofoil member when the hulls move forward through water when the first hydrofoil member is in the second position, and wherein, when the first hydrofoil member is in the second position, the first hydrofoil member is configured to generate a lifting force when the hulls move forward through water at a speed of less than seven meters per second, wherein the generated lifting force, when combined with lifting forces of other hydrofoils of the sailing vessel, is sufficient to lift both hulls above the surface of the water; and a mast configured to support a sail, wherein the first hydrofoil structure is mounted forward of the mast . <EOS>