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.

Methods of, and apparatuses for, controlling at least one trim tab of a marine vessel are disclosed.

An actuator includes a drive body including a torque-transfer surface configured to receive a torque. The actuator further includes: a drivable body including an output shaft such that rotation of the drive body causes movement of the output shaft; a first bearing configured to transfer thrust forces from the output shaft in a first direction; and a second bearing configured to transfer thrust forces from the output shaft in a second direction. At least the first bearing extends in a radial dimension beyond the torque-transfer surface.

A control system for posture control tabs of a marine vessel assists operations of a steering control. The posture control tabs are mounted on a stern of a hull to move up or down to control a posture of the hull. Actuators actuate the respective posture control tabs. When a steering instruction is provided through the steering control, a processor determines the posture control tab to be actuated and controls the actuator corresponding to the posture control tab determined to be actuated so as to change the position of the determined posture control tab.

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 stabilizing apparatus for a waterborne vessel is disclosed, the stabilizing apparatus comprising a stabilizer unit, said stabilizer unit comprising: an elongate main body suitable for attachment to said a waterborne vessel; a stabilizing fin member rotatably coupled to said elongate main body about a first axis of rotation; and a drive apparatus attached to said main body and operatively coupled to said stabilizing fin member.

The invention relates to an adjustable device, pivotally arranged about a pivot axis (230, 230a, 230b) by means of a rotating electric motor (213) having a rotor (215) and a stator (216) via a reduction gearing (214) for reducing the rotation of the motor to the adjustment movement of the adjustable device (4a, 4b, 104a, 104b), wherein the reduction gearing (214) is a planetary gearing, the axis of the electric motor (213) is coaxial with the axis of said reduction gearing (214) and with the pivot axis (230, 230a, 230b) of said adjustable device (4a, 4b, 104a, 104b) and the reduction gearing (214) and the electric motor (213, 213a, 213b) to form a compact construction.

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 watersports boat includes a hull having an underside extending from a forward bow to an aft transom along a longitudinal centerline. The underside defines a running surface that contacts water when the hull moves therein. The running surface includes a bow section and port and starboard midship running surface sections that flatten moving aft to an aft running surface section. The port and starboard midship running surface sections are separated by a keel member. The keel member has an apex lower than the aft running surface section and that inclines toward the aft running surface section aft the apex and forward a propeller positioned beneath the aft running surface section.