Abstract: A cylindrical underwater vehicle with a vertical end plate attached to a partially movable rudder, including a vertical end plate which is formed in a longitudinal direction of the underwater vehicle and is mounted on a circumference thereof so as to improve a control force with respect to the underwater vehicle. The cylindrical underwater vehicle with a vertical end plate attached to a partially movable rudder, including a fixed plate formed to radially extend, and a movable plate, a front end of which is rotatably mounted to the rear of the fixed plate, includes a first vertical end plate which is formed to have a regular width in a longitudinal direction of the underwater vehicle at an upper end portion of the movable plate and is mounted perpendicular to the movable plate.

Abstract: Disclosed is a rudder assembly formed from a rudder structure having an airfoil shaped rudder structure rotatably secured to a shaft that is rigidly secured an underlying base plate. An upper surface of the base plate includes a support pin positioned a predetermined distance from the shaft. A trailing tab having an underlying drive plate is hingedly coupled to the rudder structure. The drive plate has a centrally located slot constructed and arranged to be slidably secured to the support pin on the base plate. Rotation of the rudder structure results in direct movement of the trailing tab in proportion to the rudder position. Clockwise rotation of the rudder structure causes the clockwise rotation of the trailing tab. Counter-clockwise rotation of the rudder structure causes the counter-clockwise rotation of the trailing tab.

Abstract: Disclosed is a rudder assembly formed from a rudder structure having an airfoil shaped rudder structure rotatably secured to a shaft that is rigidly secured an underlying base plate. An upper surface of the base plate includes a support pin positioned a predetermined distance from the shaft. A trailing tab having an underlying drive plate is hingedly coupled to the rudder structure. The drive plate has a centrally located slot constructed and arranged to be slidably secured to the support pin on the base plate. Rotation of the rudder structure results in direct movement of the trailing tab in proportion to the rudder position. Clockwise rotation of the rudder structure causes the clockwise rotation of the trailing tab. Counter-clockwise rotation of the rudder structure causes the counter-clockwise rotation of the trailing tab.

Abstract: The invention relates to a rudder for ships with propeller drive, in which the propeller is arranged to rotate about a propulsion axis, with a rudder blade (15) and a flow body (20) arranged on the rudder blade (15), whereby the flow body designed in a bulb or zeppelin shape is arranged as an extension of the propulsion axis in the region of the rudder blade and is designed to self-destruct or self-detach in the event of an increase in the effect of force, blow, impact or pressure.

Abstract: In order to achieve improved properties for a fin for a rudder for water vehicles, the fin is at least partially made of a fiber-composite material. The body for the fin has one or more separated inner hollow areas which are filled with a filler material. The fin body has a front leading edge facing a rudder, a rear trailing edge facing away from the rudder, and stiffening elements arranged between both edges.

Abstract: A rudder, especially for water vessels, which in its one end is connected with the vessel's hull (1) and comprising a main rudder blade (3) and rudder flaps (5, 6) arranged to be turnable with respect to the main rudder blade (3). The new traits of the invention are that the main rudder blade (3) is arranged to be in a fixedly anchored centre position with respect to the hull (1), and having two or more rudder flaps (5, 6) mounted leading and trailing on the main rudder blade (3) and arranged to steering the vessel at high speeds, and that the main rudder blade (3) is arranged releasable from its fixedly anchored center position, and arranged to be turnable as a whole in the usual manner, especially for steering the vessel at lower speeds.

Abstract: A new displacement hull configuration providing for homogenous flow of water under the stern including side-hull bulges that are relatively constant in size from the bow to mid-ship and tapering off to about zero at the stern. Additionally, the hull is provided with a slope surface forming an angle of below about 14.degree. between the base line of the ship near mid-ship and a line extending from that point to another point on the surface to about 0.2 L from the stern, where L is the length of the ship.

Abstract: The present invention relates to a turbo kick board. The turbo kick board includes, a base, propellers attached to the base to make the base stop and go, and a rudder attached to the base to make the base turn right and left.

Abstract: A rudder assembly which includes a frame formed by upper and lower horizontal flanges which are connected to a rudder post. A pair of parallel vertical sidewalls are connected to the upper and lower flanges, and a main rudder blade is connected to the upper and lower flanges between, and parallel to, the sidewalls. A forward blade is pivotally connected to the frame at a location forward of the main blade for movement about a vertical axis between a non-turning position where the forward blade is generally aligned with the main blade, and a turning position where the rear edge of the forward blade engages one of the sidewalls to form a channel for feeding water along the backside of the main blade to improve rudder turning efficiency.

Abstract: A novel fin for surfboards and watercraft that includes a pivoting rudder-like section that swings out when a turn is commenced, enhancing the maneuvrability of the surfboard by reducing the resistance of the fin as it moves sidewards through the water in a turn and by redirecting the water flow through the pivoting rudder section in the direction of the turn. A fixed blade attaches to the surfboard and a separate pivoting fin section is joined to the fixed blade by two pivot pins. Protruding from a vertical hole in the top of the pivoting fin section is a spring loaded pin which presses into a channel in the underside of a foil integrated into the underside of the fixed blade mounting section. The channel is deepest in the center of the foil thus the spring loaded pin in travelling back and forth along the channel seeks the deepest portion which tends to align the two fin blade sections.

Abstract: Disclosed is apparatus for sealing the surface spaces between and along the leading portion of a hydrofoil (16) and its movable flap (18). The apparatus includes an upper seal member (44) and a lower seal member (46) that are joined together by a spring-biased retention assembly (53). The seal members (44, 46) are joined at one edge (51) to the trailing edge of the leading portion of a hydrofoil. The trailing edges (45) of the seal members are maintained in continuous slidable contact with the leading edge (37) of the hydrofoil flap (18).

Abstract: A ship's rudder having a flap at its trailing end, actuating apparatus for such flap comprises a sector member which is mounted on the flap at top end thereof, extending toward a rudder stock and has teeth concentric with pivot pins mounting the flap on the rudder and engaged with teeth arranged concentrically with a rudder stock on a stationary guide member surrounding the rudder stock.

Abstract: A high-performance main rudder with a stabilizer fin (10) articulated to the rudder plate (20) for ocean-going ships is provided with a fork-like sliding bearing (30) for a swivel piston (40) or drive rod held and guided by interchangeable slide or guide blocks (60) mounted in the fork arms (31,32) of the sliding bearing (30) which is pivoted on a hinging bolt (50) fixed to the hull.

Abstract: A removable rudder assembly for a boat includes a rudder and upper and lower rudder shafts which are detachably connected together. The lower shaft is connected to the rudder, and connecting plugs are attached to the adjacent ends of the upper and lower shafts. A pair of wedge-shaped tongues on one plug extend into wedge-shaped recesses in the other plug. A rod extends through the upper shaft and the connecting plug attached thereto and is threadedly engaged with the connecting plug on the lower shaft to hold the two plugs together.

Abstract: The invention relates to a rudder for aquatic craft wherein the rudder member is provided with a fin which is pivotable independently thereof and with a rotor on the front edge of the rudder member and/or between the latter and the fin or between the rudder member and a guide member mounted in front of said rudder member.

Abstract: A rudder arrangement for ships comprises a rudder blade having a horizontal ivision to form an upper and a lower rudder blade. Each rudder blade is controllable as a separate rudder blade via a rudder shaft and an associated rudder machine.