A system and method that reduces spatial positioning control requirements for maintaining reduced wave-making resistance of at least one following vessel in a fleet operating in a seaway, by determining a position of the at least one following vessel within a coordinated zone, which is a zone within a reduced wave-making resistance region of the Kelvin wake of at least one lead vessel, at which a surge motion of the vessels is synchronized with each other. By positioning the at least one following vessel in the coordinated zone, the spatial positioning control requirements of the at least one following vessel can be reduced.

The invention relates to a hydrofoil for small vessels (1), comprising a front foil set (3) formed by a wing (32), with marked negative dihedral, which is attached to the vessel (1) by means of two struts (31), of circular or quasi-circular section, and a rear foil set (2) formed by a wing (22) that is flat or with minimal dihedral, attached to the vessel (1) by means of two struts (21); the front (3) and rear (2) foil sets being positioned longitudinally forward and aft, respectively, of the overall centre of gravity of the vessel, including also the pilot and/or crew.

A catamaran which has a centre tunnel, the opposite sides (105a, 105b) of which form asymmetrical pontoons, which are mirror images of each other, and which pontoons have buoyancy, which has been adapted so that when the catamaran moves in water, the centre tunnel functions as a combined water and air tunnel. When the catamaran is stationary in water, the ceiling (108) of the centre tunnel is in water. The ceiling of the centre tunnel further curves in a cylindrically convex manner downwards when going from the bow (116) to the direction of the stern (118) only after an essentially horizontal portion (401) of a distance (d), which essentially horizontal portion is located between the pontoons.

An auxiliary hull unit detachably mounted to a transom on a marine vessel, wherein the hull unit is mounted at least partially below the water line of the vessel and arranged to extend rearwards parallel to the rearward extension of hull sections adjacent to the hull unit. The hull unit comprises a rear hydrofoil system for the marine vessel; the rear hydrofoil system comprising at least one pair of foldable hydrofoils which are pivotable in a lateral direction relative to the hull unit, wherein each hydrofoil is controllable by at least one actuator for displacement of the at least one pair of foldable hydrofoils in the lateral direction of the hull unit between a stowed position and a deployed position. The hull unit can be provided with a propulsion unit.

Disclosed are an extendable and retractable fairing for a container ship and a control method thereof. The extendable and retractable fairing includes a controller, a support skeleton, a wind velocity detector, a first flexible deflector, second and third flexible deflectors, and accommodation mechanisms. The third flexible deflectors are sequentially arranged between the first and second flexible deflectors; the support skeleton includes guide-track grooves; the second and third flexible deflectors each are slidably provided in a corresponding guide-track groove; the accommodation mechanisms each include an accommodation winding tube and a drive motor; the accommodation winding tube is provided at one side of a deck at the bow; the drive motor is connected to the accommodation winding tube; the wind velocity detector is provided on the first flexible deflector; and the second and third flexible deflectors each are provided in the accommodation winding tube.

The present invention discloses a marine fishtail rudder, including a rudder blade, a first tail plate and a second tail plate. The rudder blade includes a first rudder surface and a second rudder surface. The first tail plate is hinged on the first rudder surface. The second tail plate is hinged on the second rudder surface. An electric motor is provided in the rudder blade. The electric motor is used to drive the first tail plate and the second tail plate to rotate, so that a trailing edge of the first tail plate and a trailing edge of the second tail plate are close to or away from a trailing edge of the rudder blade. The present invention discloses a marine fishtail rudder, wherein tail plates are respectively arranged on the two rudder surfaces of a rudder tail portion, and the tail plates are rotated by an electric motor. When steering, the tail plates are unfolded to form a rudder shape of a fishtail rudder to obtain a higher rudder effect. When sailing straight or reversing, the tail plates are closed to form a rudder shape of a streamlined rudder and reduce the resistance of the rudder.

A floating structure for transport is presented, formed by a train arrangement of rotary bodies of revolution that reduces the drag of same during sailing, the train arrangement of rotary bodies being formed by a front body, intermediate bodies and a rear body that have rotation synchronized with the speed of travel of the structure, the intermediate bodies of revolution being connected together by longitudinal rotation shafts by connections secured to an upper platform, while the longitudinal rotation shafts of the front body and the rear body are connected to the rotation shafts of adjacent bodies by hinges, which are pivotably connected to an end of draft-adjustor, pivotably connected at their other ends to the upper platform, the longitudinal rotation shafts being disposed perpendicular to the structure's travel direction and associated with actuators. The rotary bodies are separated by a distance of approximately 5% or less of their diameter.

A system for retracting a foil of a watercraft in the event of an impact has a strut extending from a watercraft, the strut has a pivot at one end that connects the strut to the watercraft and allows the strut to articulate around the pivot, a foil attached at a second end of the strut, wherein the foil has sufficient surface area configured to generate positive lift when the watercraft is traveling over water; and a retraction system including a mechanical fuse connected to the strut, the mechanical fuse holds the strut stationary and is subject to forces from the strut when the strut travels through water, the retraction system allows retraction of the strut around the pivot when the strut experiences a force greater than a predetermined limit, and the foil is configured to articulate on the strut to maintain positive lift orientation as the strut is retracting.

The invention pertains to the use of an easy-to-clean soft fiber-coated material on the underwater surface of structures to mimic mammal pelage and as such reducing residual drag, wherein said material comprises or consists of fibers having an average fiber length between 0.3 and 4 mm, and an average fiber thickness between 5 and 80 μm. The underwater surface of structure is preferably the hull of a movable or moving vessel, or the underwater part of a static structure such as offshore wind monopiles and off-shore rigs. In some embodiments, the invention pertains to the reduction of fuel consumption of a nautical vessel passing through water.

A hull auxiliary mechanism for reducing a draft of a hull, includes a guide baffle on both sides of the hull. Two ends of the guide baffle extend out of a front end and a rear end of the hull. A Lower end of the guide baffle extends out of a bottom of the hull. The front end and the rear end of the hull are flat inclined plates. The bottom of the hull is a flat plate; the hull auxiliary mechanism also includes a water resistance mechanism, and the water resistance mechanism includes a first diversion pressure plate, a second diversion pressure plate and a third diversion pressure plate. Both sides of the guide baffle are used to direct a flow of water to the hull. At the same time, there are three groups of diversion pressure plates at the bottom of the hull.