Hydrofoil arrangement

A Hydrofoil arrangement for a hydrofoil craft the hydrofoil arrangement comprising:

• at least one lifting wing to be fully submerged;
• at least two struts pivotally disposed on the hydrofoil craft, each strut of said at least two struts being connected to said at least one lifting wing, each said strut being disposed with a respective center of effort of hydrodynamic forces thereof behind a pivot axis of each said strut during forward travel of the hydrofoil craft through a water surface;
• when the hydrofoil craft, during forward travel, experiences a disturbance in roll-angle resulting in a transverse movement out of equilibrium of the hydrofoil craft relative to the water surface, said at least two struts being constructed for pivoting relative to the hydrofoil craft, when pivoting, said at least two struts actuate at least one means for inducing transverse displacement of a center of effort of said at least one lifting wing in a direction of the transverse movement of the hydrofoil craft, said at least two struts actuating said at least one means for inducing transverse displacement via a direct mechanical coupling for modifying a transverse distribution of pressure on said at least one lifting wing for rolling the hydrofoil craft back to equilibrium, said direct mechanical coupling including a linking device disposed for ensuring that vertical components of rotation of each said strut are in the same direction, and said direct mechanical coupling including said at least two struts, and said at least one means for inducing transverse displacement being said at least one lifting wing disposed for deflecting torsionally around a transverse axis between said at least two struts;
• each said strut being pivotally connected to said at least one lifting wing about a respective lower strut pivot axis, said at least two struts being a port strut and a starboard strut, an angle +μ exists between said pivot axis and said lower pivot axis of said port strut, and a corresponding angle −μ exists between said pivot axis and said lower pivot axis of a starboard strut, as seen from the rear of the hydrofoil craft.

A Hydrofoil arrangement for a hydrofoil craft the hydrofoil arrangement comprising:

• at least two struts pivotally disposed on the hydrofoil craft, each strut of said at least two struts being connected to a respective lifting wing disposed for being fully submerged, each said strut being disposed with a respective center of effort of hydrodynamic forces thereof behind a pivot axis of each said strut during forward travel of the hydrofoil craft through a water surface;
• when the hydrofoil craft, during forward travel, experiences a disturbance in roll-angle resulting in a transverse movement out of equilibrium of the hydrofoil craft relative to the water surface, said at least two struts being constructed for pivoting relative to the hydrofoil craft, when pivoting, each said strut actuates a respective means for inducing transverse displacement of a center of effort of said respective lifting wing in a direction of the transverse movement of the hydrofoil craft, each said strut actuating said respective means for inducing transverse displacement via a direct mechanical coupling for modifying a transverse distribution of pressure on said lifting wings for rolling the hydrofoil craft back to equilibrium, said direct mechanical coupling including a linking device, disposed for ensuring that vertical components of the rotation of each said strut are in a same direction, and said direct mechanical coupling including said at least two struts, and said respective means for inducing transverse displacement being said respective lifting wings disposed for rotating together with said respective strut.