A system for attitude control and stabilization of a marine craft includes at least one elongate substantially planar surface, which may be rigid or flexible, disposed on either side of and in substantial alignment with a bottom of the planing hull of the marine craft. The elongate surface, in a rigid form, includes a tongue-like distal end slidably captured as a fluid hinge upon a region of the hull about 2 to 8 feet forward of the transom. In a flexible form, a distal end of the elongate planar surface may be secured directly to the hull. The elongate surface further includes an actuation portion proximal to a transom of the craft. The system also includes an actuator selectably slidable and securable within an actuation sleeve, the sleeve secured to the transom of the craft. Also included in the system are elements, manual, hydraulic or electrical, for selectably advancing the actuator relative to the hull to induce a selectable angulation of the elongate planar surface relative the bottom of the hull of the craft.

A system for attitude control and stabilization of a marine craft includes at least one elongate substantially planar surface, which may be rigid or flexible, disposed on either side of and in substantial alignment with a bottom of the planing hull of the marine craft. The elongate surface, in a rigid form, includes a tongue-like distal end slidably captured as a fluid hinge upon a region of the hull about 2 to 8 feet forward of the transom. In a flexible form, a distal end of the elongate planar surface may be secured directly to the hull. The elongate surface further includes an actuation portion proximal to a transom of the craft. The system also includes an actuator selectably slidable and securable within an actuation sleeve, the sleeve secured to the transom of the craft. Also included in the system are elements, manual, hydraulic or electrical, for selectably advancing the actuator relative to the hull to induce a selectable angulation of the elongate planar surface relative the bottom of the hull of the craft.

A boat includes at least three trim devices positioned aft of the boat's transom. To improve the boat's ability to get on place, each trim device is initially positioned to a deployed position. The speed of the boat is then determined as the boat gains speed. When the speed of the boat exceeds a first predetermined threshold, the first trim device is moved from the deployed position to a non-deployed position. When the speed of the boat exceeds a second predetermined threshold, the second trim device is moved from the deployed position to a non-deployed position. When the speed of the boat exceeds a third predetermined threshold, the third trim device is moved from the deployed position to a non-deployed position. At least one of the first, second, and third predetermined thresholds is different from the other two of the first, second, and third predetermined thresholds.

A boat includes at least three trim devices positioned aft of the boat's transom. To improve the boat's ability to get on place, each trim device is initially positioned to a deployed position. The speed of the boat is then determined as the boat gains speed. When the speed of the boat exceeds a first predetermined threshold, the first trim device is moved from the deployed position to a non-deployed position. When the speed of the boat exceeds a second predetermined threshold, the second trim device is moved from the deployed position to a non-deployed position. When the speed of the boat exceeds a third predetermined threshold, the third trim device is moved from the deployed position to a non-deployed position. At least one of the first, second, and third predetermined thresholds is different from the other two of the first, second, and third predetermined thresholds.

A method for watercraft efficiency at various speeds by use of at least one adjustable trim tab with a surface by calculating by the total surface area of the planar surface and determining the surface area necessary of the planar surface of at least one trim tab, and mounting the trim tab substantially under the hull. Provided in the method is determining the overall length of the hull, determining the maximum beam of the hull, multiplying the overall length of the hull by the maximum beam, taking a resultant of the overall length and maximum beam and multiplying that resultant by a percentage in the range of about one to about three, and taking the resultant and dividing it by the number of trim tabs mounted to the hull. Adjusting the trim tab by raising or lowering the rear of the planar surface, based on speed, to achieve higher efficiency.

A method for watercraft efficiency at various speeds by use of at least one adjustable trim tab with a surface by calculating by the total surface area of the planar surface and determining the surface area necessary of the planar surface of at least one trim tab, and mounting the trim tab substantially under the hull. Provided in the method is determining the overall length of the hull, determining the maximum beam of the hull, multiplying the overall length of the hull by the maximum beam, taking a resultant of the overall length and maximum beam and multiplying that resultant by a percentage in the range of about one to about three, and taking the resultant and dividing it by the number of trim tabs mounted to the hull. Adjusting the trim tab by raising or lowering the rear of the planar surface, based on speed, to achieve higher efficiency.

A boat hull, comprising a plurality of chines extending downwardly from a bow of the hull towards a stern of the hull, each chine in transverse cross section being substantially straight and substantially horizontal and arranged so that a centreline of each chine lies in a plane which is parallel to a central plane of an adjacent chine, wherein collectively the chines in a lower forward portion of the hull are arranged generally V shaped in cross section and wherein an aft portion of a base of the hull is generally flat and each chine terminates at the flat aft portion.

A boat hull, comprising a plurality of chines extending downwardly from a bow of the hull towards a stern of the hull, each chine in transverse cross section being substantially straight and substantially horizontal and arranged so that a centreline of each chine lies in a plane which is parallel to a central plane of an adjacent chine, wherein collectively the chines in a lower forward portion of the hull are arranged generally V shaped in cross section and wherein an aft portion of a base of the hull is generally flat and each chine terminates at the flat aft portion.

A wake adjustment system for a boat may include a wake adjustment device mountable at the stern of the boat to deflect water moving past a stern trailing edge of the boat's running surface. The wake adjustment device includes water deflectors that are rotatable about a first pivot axis for varying a degree of wake adjustment. The wake adjustment device is mounted to the boat proximal to the centerline.

A wake adjustment system for a boat may include a wake adjustment device mountable at the stern of the boat to deflect water moving past a stern trailing edge of the boat's running surface. The wake adjustment device includes water deflectors that are rotatable about a first pivot axis for varying a degree of wake adjustment. The wake adjustment device is mounted to the boat proximal to the centerline.