Abstract: A bearing assembly for use on a rudder shaft of a vessel or boat wherein the shaft has a thin cylindrical rubber sleeve that encompasses it. The outer peripheral surface of the rubber sleeve is bonded to a fiberglass ring which is bonded to an elongated annular rubber member which is in sliding contact with the inner peripheral surface of a teflon ring which is turn is bonded to the inner peripheral surface of a fiberglass sleeve. The latter sleeve in turn is bonded to the inner periphery of the upper end of a housing that is attached to the hull of a vessel. The lower portion of the rudder shaft has secured to it an annular rubber bearing that is in frictional sliding contact with a teflon ring that is secured to the inner peripheral surface of the lower end of the housing.

Abstract: A light-weight fishing boat is provided including an electric trolling motor mounted from one end portion thereof for actuation and steering control thereof by a fisher person disposed on the boat hull and the other end of the boat hull supports a stationary rudder panel exteriorly of the boat and below the water line thereof with the rudder panel being of the non-steerable type, disposed in a plane generally paralleling the longitudinal center line of the boat and having a periphery enclosing a rudder panel area of at least 115 square inches. The rudder panel stabilizes the light-weight fishing boat against wind action on the associated boat hull end and allows precise movement, positioning and orientation of the light-weight boat hull by the operator of the electric trolling motor with a minimum amount of power consumed by the trolling motor.

Abstract: A bearing assembly for use on a rudder shaft of a vessel or boat wherein the shaft has a thin cylindrical rubber sleeve that encompasses it. The outer peripheral surface of the rubber sleeve is bonded to a fiberglass ring which is bonded to an elongated annular rubber member which is in sliding contact with the inner peripheral surface of a teflon ring which in turn is bonded to the inner peripheral surface of a fiberglass sleeve. The latter sleeve in turn is bonded to the inner periphery of the upper end of a housing that is attached to the hull of a vessel. The lower portion of the rudder shaft has secured to it an annular rubber bearing that is in frictional sliding contact with a teflon ring that is secured to the inner peripheral surface of the lower end of the housing.

Abstract: Disclosed is a drive assembly for mounting on a marine vessel, movable between first and second configurations. In the first configuration, the drive assembly, which may include a propeller, is at least partially withdrawn from the water. In the second configuration, the drive assembly is linked to a power source carried by the vessel whereby the drive assembly may be operated to drive the vessel relative to the water. A steering linkage to a steering mechanism may also be provided whereby, with the drive assembly in the second configuration, the drive assembly is linked to the steering mechanism so that the propeller is oriented by operation of the steering mechanism to at least assist in steering the vessel through the water.

Abstract: A sailboard assembly is disclosed which has a body on which the user stands, a mast, boom and sail assembly for propulsion of the board. The mast-boom-sail assembly is mounted to the board by a mast mounting assembly which permits limited angular displacement of the mast about a generally normal orientation to the board for maneuvering of the center of pressure of the sail and yet provides support of the mast above the board upon release of the boom. The sailboard assembly also preferably includes a steering assembly having a rudder and foot-operated turntables that are used to turn the rudder.

Abstract: A boat, especially a catamaran, having a rectangular collapsible frame with a one-man mast stepping structure. The tubular frame is comprised of fore, aft and central sub-frame assemblies which can be collapsed so as to be easily car topable and serve as a rack for containing other components of the catamaran. Inflatable hulls are secured in bracket arches on the undersides of the sub-frame assemblies. A rudder frame or cage is pivotally mounted on an aft sub-frame assembly and is adapted to receive a rudder, which is identical to and interchangeable with daggerboards. A system of adjustable rope stays is provided for adjusting the mast.

Abstract: A rudder assembly for sailboats which comprises a rudder support frame, a rudder blade, a tiller frame, a pivot bracket, and a lever. With the rudder blade in the lowered position, the weight of the tiller arm bears down on the pivot at the junction of the lever and the pivot bracket preventing the upward movement of the lever and locking the rudder blade in place. To raise the rudder blade, the tiller is lifted up, pulled forward, then pushed down, causing the lever to rotate and pulling the upper rear portion of the rudder blade forward. Adjustments in the rake angle of the rudder blade and the force required to kick up the rudder blade may be made.

Abstract: A sailboard assembly is disclosed which has a body on which the user stands, a mast, boom and sail assembly for propulsion of the board. The mast-boom-sail assembly is mounted to the board by a mast mounting assembly which permits limited angular displacement of the mast about a generally normal orientation to the board for maneuvering of the center of pressure of the sail and yet provides support of the mast above the board upon release of the boom. The sailboard assembly also preferably includes a steering assembly having a rudder and foot-operated turntables that are used to turn the rudder.

Abstract: A ship includes a rudder and a propeller having a propeller shaft arranged adjacent a stern of the ship. A bottom of stern is made shallow to expose the propeller for a long distance and the rudder is arranged in a space defined by the bottom of the stern, the propeller shaft and a propeller post supporting the propeller shaft, thereby arranging the rudder nearer to a bow of the ship than the propeller. The propeller shaft comprises oil-water partition rings encircling the propeller shaft, and a bearing for the propeller shaft is formed with circular grooves which accommodate therein the oil-water partition rings and communicate with at least one oil-water separating pressurizing tank to form a water exhausting passage on an outer side of each the partition ring and an oil exhausting passage on an inner side of the partition ring.

Abstract: A sailboat steering assembly is provided which has a hiking stick that assumes fixed positions in use, but smoothly responds to any changes induced by manual manipulation of the helmsman. Typical swinging and flopping of the unattended hiking stick are eliminated.

Abstract: An energy-saving rudder in which auxiliary wings are extended from a conventional rudder so that the rotating energy of the propeller slip stream which impinges on the auxiliary wings can be recovered and converted into the propulsion thrust. Also disclosed is a method for fabricating a rudder with wings. The peripheral portion (trailing edge, leading edge and tip portions) of each auxiliary wing and the root portion thereof are separately fabricated by casting and the upper and lower wing surface plates are welded to the frame which is prepared by assembling the peripheral and root portions of each auxiliary wing. The auxiliary wings therefore can be fabricated and positioned with a high degree of accuracy.

Abstract: Disclosed herein is a marine propulsion device for a boat hull having a transom, which device comprises a steering post having a longitudinal axis and adapted to be connected to the boat transom for rotation about the longitudinal axis, a propulsion assembly including a rotatably mounted propelling element, and linkage connecting the propulsion assembly and the steering post for common pivotal movement about the longitudinal axis and for movement of the propulsion assembly relative to the steering post between a running position and a second position elevated from the running position and against steering movement of the propulsion unit assembly relative to the steering post.

Abstract: A catamaran tiller having a grip is provided to permit tension to be applied to the tiller more easily. In one embodiment the grip extends laterally from a sleeve which fits over the tiller rod and is secured thereto at a desired location. Provision is made to have the grip rotatably mounted on the sleeve or for the sleeved to be secured with the grips in alternative positions. A circular grip is also disclosed.

Abstract: A navigable water craft having a first tool mounted on the bow area for removing pollutants. The tool may be a basket or scoop which is mounted to be raised and lowered such as through hydraulic rams. Additionally, the basket may be mounted to be rotated about a vertical axis from side-to-side of the craft. At the stern area is mounted a weed removal tool preferably in the form of a triangular rigid structure which, in use, is lowered to be dragged on the sea bed by a line wound on a winch mounted on the craft. A control station including a operator's seat is located between the stern and bow forwardly of the winch which preferably is located in an open recessed compartment. To protect the steering rudder of the craft, a barrier is positioned at the stern to prevent the weed removal tool from engaging the rudder during raising or lowering of the tool.

Abstract: An upstanding panel-like body is provided including top, bottom and front and rear margins and opposite side surfaces extending between those margins. The opposite side surfaces are generally vertically straight and parallel. The front and rear margins are transversely elliptically rounded and the opposite sides of the convexly rounded front margin merge rearwardly into first generally constant radius of curvature laterally outwardly convex forward opposite side partial cylindrical surfaces which in turn merge rearwardly into second generally constant radius of curvature and laterally outwardly concave mid-length opposite side surfaces merging rearwardly into third generally constant radius of curvature laterally outwardly convex rear opposite side partial cylindrical surfaces joined at their rear portions by the convexly rounded rear margin of the body.

Abstract: A double-ended two hull sailing vessel has a main hull and an auxiliary hull, where the distance between the auxiliary hull and the main hull can be varied for controlling heel. The mast is supported on a curved track for varying the angle of the mast relative to the water surface to control the upward lifting force of wind on the vessel to assist in maintaining both hulls level with minimum wetted surface area. A rudder/airfoil assembly is provided at each end of the main hull for providing a lifting force to the forward end of the vessel and for steering the vessel. A control system is provided so that only one of the rudders is in the water and for controlling the orientation of the rudder that is in the water.

Abstract: A sailing craft having hydrodynamically shaped catamaran hulls and tapered configuration rudder assemblies attached to each hull. Low draft keels are attached to the fore one-half bottom portions of the hull and a pitch-sensitive variable camber mast and main sail assembly is rotatably mounted on a cross-beam framework which interconnects the two hulls. The mast is constructed and rigged to bow with respect to the longitudinal plane of the sailing craft which passes through the roll axis in response to a high velocity wind force. The bow decreases as the wind velocity decreases and the mast rotates to form a camber adjustment through use of battens attached to the main sail sheet(s). The rudder assembly and control bungy cords and lines permit selective raising and lowering and automatic raising upon contact with underwater obstacles. The deck structure provides for quick dismantling and ease of sailing.

Abstract: Disclosed herein is a marine propulsion device for a boat hull having a transom, which device comprises a steering post having a longitudinal axis and adapted to be connected to the boat transom for rotation about the longitudinal axis, a propulsion assembly including a rotatably mounted propelling element, and linkage connecting the propulsion assembly and the steering post for common pivotal movement about the longitudinal axis and for movement of the propulsion assembly relative to the steering post between a running position and a second position elevated from the running position and against steering movement of the propulsion unit assembly relative to the steering post.

Abstract: A kayak steering apparatus for controlling kayak weathercocking during operation in side wind conditions. An elastomeric line in tension and a non-elastic control line are each attached to opposite side arms of a vertically pivoting rotor which is mounted to the stern of a kayak, with the rotor further being connected to a rudder. A kayak operator can, by hand, pull on or release the control line which acts in combination with tension in the elastomeric line to turn the rotor and thereby set rudder angular position. For setting vertical depth, the rudder is connected to the rotor by a pin which allows the rudder to pivot about a generally horizontal axis. Depth adjustment is also hand controllable by pulling or releasing a line connected to the upper portion of the rudder at a location offset from the horizontal axis defined by the pivoting pin.

Abstract: A safety shroud for attachment to the rear surface of the transom of an unmodified boat hull equipped with an inboard engine and a propeller tube and shaft rigidly fixed to the engine and extending with clearance through an enlarged opening in the transom, and a propeller on the shaft; the shroud being longitudinally and transversely downward concave to overlie the top and partly enclose the sides of the propeller, the shroud in longitudinal section being upwardly and rearwardly curved from the forward bottom edge of the shroud to just ahead of the propeller zone and then extending straight rearwardly. The lateral edges of the shroud extend generally upwardly and rearwardly from the forward bottom edge of the shroud to merge with the top rear edge thereof. Preferably the shroud is composed of inner and outer interconnected plastic shells, the outer shell having a downward concave reinforcing strut, closed at its bottom by the inner shell, and having a metal rudder support shaft therein.

Abstract: This invention is directed to a tiller extension which is used on the tiller of boats or vessels, in particular. The tiller extension of this invention is directed to a quick release, remote release, telescoping extension device.

Abstract: A watercraft rudder assembly including a rudder blade having a forward planar rigid portion and a rearward planar flexible fin portion, such fin portion having a resiliency rendering it planar at low craft speeds and bendable to opposite sides of the rigid rudder portion at high craft speeds so that low speed turning ability of the craft is substantially enhanced.

Abstract: An asymmetric aftbody for the hull of a ship having a twisted shape operative to achieve higher efficiency at practically all aftbody block coefficients by improving water flow and adapted to provide a shape wherein the tangential components of the wake are distributed as favorably as possible over the entire propeller circumference, the aftbody having an upper part above the propeller shaft which is combined with a part of the hull below the propeller shaft, the sectional areas of the hull having a bulbous or a U-shaped configuration with the center lines of the sectional areas being inclined away from the vertical longitudinal plane through the propeller center in opposite directions to that of propeller rotation such that when seen from aft the bulbous or U-shaped stern below the propeller shaft forms an angle of inclination with the vertical longitudinal plane in a direction opposite to that of propeller rotation.

Abstract: The invention relates to an electric rudder rotor which in its simplest construction is in the form of an externally running underwater electric motor and comprises a fixed stator and a rotating rotor, which carries the rotor cylinder, the stator being supplied with electric current and the rotor being rotated by magnetic interaction between the stator and the rotor.

Abstract: The object of this invention is an element, such as a rudder, and aircraft wing, a boat keel, a hydrofoil or an airfoil or the like, which is adapted to move through water or air and which is so designed that the water or the air is allowed to enter at the upstream edge of the element into and through a hollow space within said element and to leave said element at the trailing edge thereof, said hollow space within said element being divided into two halves by a central longitudinal partition (6) within said element, such that said element on either said of the said central partition (6) has a flow gap which, optionally, is divided into parallel passages by transverse partitions (4a, 4b, 5a-5c), the arrangement being such that the flow of water or air through and out of the gap between the central partition (6) and that side of the element which, in response to the angular deflection or profile, forms the suction side of said element, will be substantially larger than through the other gap.

Abstract: A rudder blade means of the type designed to reduce the drag produced by rudder blades of conventional design. The novel design, having utility in any vessel that travels through a fluid medium and incorporates a substantially vertically aligned chamber formed internally of the rudder body. The chamber has a narrow, slot-like portion that is in open communication with the trailing edge of the rudder body, and an enlarged, bore-like portion remote from said trailing edge but in open communication with the innermost portion of said slot-like portion. In applications where the rudder body is mounted to a sea-going vessel, and wherein such rudder body has a submerged portion and an un-submerged portion, water enters the chamber, in a counterswirling pattern, through the slot-like portion, and is driven upwardly, by water pressure, through the bore-like portion and is expelled above the water line through the uppermost region of said slot-like portion of such chamber.

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 tilting rudder for conversion of a sailboat. The rudder pivots upwardly into concealment in a trunk located somewhat forward of the transom in the cockpit of a sailboat. A seal closes the trunk when the rudder is concealed and opens when the rudder is pivoted to the operative steering position. The rudder is journalled in a sleeve and the sleeve is supported in the trunk. The sleeve captures the rudder bar axially while permitting full rotation of the rudder for steerage. Gasketing at the aft upper corner of the trunk prevents any substantial leakage of water into the cockpit of the sailboat.

Abstract: This invention provides a marine propulsion device comprising a propulsion unit, a transom bracket adapted to be fixedly connected to a boat transom and a swivel bracket mounted on the transom bracket for pivotal movement about an axis which is horizontal when the transom bracket is boat mounted. The marine propulsion device also includes a king pin assembly mounted on the swivel bracket for pivotal steering movement of the propulsion unit and a mounting mechanism for mounting the propulsion unit on the king pin assembly and permitting limited rotational movement of the propulsion unit relative to the king pin assembly. The marine propulsion device also includes a trim tab mounted on the propulsion unit for pivotal movement about an axis transverse to the horizontal axis, and a linkage mechanism for displacing the trim tab about the transverse axis in response to rotational movement of the propulsion unit relative to the king pin assembly.

Abstract: A device that enhances the feel of a sailboat tiller when such tiller is manually attended, and that maintains any preselected position of such tiller when it is left unattended.Novel clamping members are laterally disposed relative to one another on the transom portion of a sailboat, and releasably secure opposite ends of an elongate, elastomeric cord such that the cord lies tautly in a horizontal plane against such transom when no external force other than such clamping members is imparted thereto.A combination wedge and roller element is fixedly secured to the underside of a conventional tiller, and either the roller or the wedge engages the cord, thereby elongating the cord, when the invention is in use. The roller element engages the cord when the tiller is attended to improve the feel of such tiller, and the wedge element engages the cord when the tiller is unattended, to thereby hold the tiller against substantial movement.

Abstract: A wind-propelled craft is disclosed which comprises a hull supporting a pair of unstayed masts arranged to pivot about an axis lying in an approximately horizontal plane between a first position, in which one mast extends substantially vertically and the other extends generally at right-angles thereto away from the hull, and a second position, in which the relative configuration of the masts is reversed, each mast, in use, having a sail attached thereto or incorporating an aerofoil, whereby in use one sail or aerofoil can be trimmed to the wind to provide forward propulsion while the other sail or aerofoil simultaneously provides upward lift tending to counteract rolling or heeling force applied to the hull by wind impinging on the first sail or aerofoil. A steering control system is also described in which a steering link passes from a control point through the region of the pivot point of a mast to a rudder.

Abstract: An improved rudder steering apparatus for ships is disclosed including a rudder-jam-responsive device for automatically disconnecting the tiller from the rudder shaft upon the occurrence of jamming or wedging of the rudder. A pair of cam track levers pivotally connected with a plate mounted on the rudder shaft are normally biased by an hydraulic piston-cylinder motor into engagement with a follower that is connected with the tiller. The motor is automatically operable by an overload-responsive device (such as a pressure-relief safety valve or an accumulator tank) to disconnect the levers from the follower device when the rudder is in a wedged or jammed condition.

Abstract: The invention relates to a rudder for watercraft with a stabilizer (13) articulated to the rudder blade (11), the stabilizer and the rudder blade being connected in articulated manner by articulated blades and several connecting bolts. The in each case upper articulated bush is supported on the in each case lower articulated bush, accompanied by the interposing of a self-adjusting, annular centering device mounted in free-floating manner and taking up the axial weight.

Abstract: A sailing craft having hydrodynamically shaped catamaran hulls and tapered configuration rudder assemblies attached to each hull. Low draft keels are attached to the fore one-half bottom portions of the hull and a pitch-sensitive variable camber mast and mail sail assembly is rotatably mounted on a cross-beam framework which interconnects the two hulls. The mast is constructed and rigged to bow with respect to the longitudinal plane of the sailing craft which passes through the roll axis in response to a high velocity wind force. The bow decreases as the wind velocity decreases and the mast rotates to form a camber adjustment through use of battens attached to the mail sail sheet(s). The rudder assembly and control bungy cords and lines permit selective raising and lowering and automatic raising upon contact with underwater obstacles. The deck structure provides for quick dismantling and ease of sailing.

Abstract: A hull (8) of a boat, having a keel (9) and a rudder (10). Both the rudder and the keel can be swung about an axis (14) extending in the longitudinal direction of the hull.

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 rudder assembly for marine craft wherein the main rudder carries one or more fins pivotable as well as lockable in relation to it, wherein the actuating and control devices for the fin are integrated with the rudder assembly.

Abstract: The fin of a fin rudder can, as desired, be locked to the rudder (single-area rudder), to the ship (forced control of fin through movement of main rudder), or separately pivotable (independent fin movement), the locking or actuating device being positioned within the hull (FIG. 1).

Abstract: A sailboat of the catamaran type has a pair of hulls joined by a pair of wedge shaped crossbeams, the crossbeams geometry being oriented to provide balanced distribution of loading on the hulls and crossbeams. An easily dismantable, multipart mast is stepped on the forward crossbeam and has a hook engaged by a ring or the like which is coupled to the shrouds and stay cables. The opposited ends of these cables has a unique "T" member for quick coupling with slotted shroud and stay anchor plates on the hulls of the boat. The rudder assembly includes an extruded rudder blade mounted in a rudder guide for vertical movement such that it is automatically raised upon encountering an obstruction.

Abstract: A propulsion drive system for a boat is provided where a propeller is centered within a tunnel. A converging channel, open towards the bottom, extends in front of the tunnel and a converging nozzle extends from the rear of the tunnel. The system is provided with apparatus for mounting the propeller in the center of the tunnel widthwise and a suitable rudder is mounted to the rear of the converging nozzle. The propulsion drive system can operate quietly with little vibration and no cavitation.

Abstract: A rudder assembly for sail boats and the like comprising a rudder support frame pivotally attached to the stern portion of the boat, a substantially horizontal tiller fixedly attached to the upper portion of the rudder support frame, a rudder blade pivotally coupled to the rudder support frame, a rudder blade control mechanism including kickup control arm pivotally coupled to the upper portion of the rudder blade and an interconnecting kickup control member pivotally coupled between the kickup control arm and the substantially horizontal tiller to selectively move the rudder blade between a first or lower position, intermediate or trail position and second or upper position by the pushing or pulling of the kickup control arm, the rudder blade control mechanism further includes a lock member fixedly attached to the kickup control arm disposed to selectively engage the substantially horizontal tiller to lock the rudder blade in the lower or upper position.

Abstract: Disclosed herein is an outboard motor comprising a propulsion unit including a rotatably mounted propeller, structure adapted to be fixedly connected to a boat transom and connected to the propulsion unit for mounting of the propulsion unit for pivotal movement about an axis which is horizontal when the mounting structure is boat mounted, a trim tab mounted on the propulsion unit for pivotal movement about an axis transverse to the horizontal axis, and a linkage for displacing the trim tab about the transverse axis in response to movement of the propulsion unit about the horizontal axis.

Abstract: A sporting vehicle powered only by the energy of the occupant for travelling on bodies of water at unprecedentedly high speeds. The vehicle comprises a frame supported while stationary on hulls or floats, and including a seat for the occupant and a set of pedals for enabling him to cause vehicle movement either by an air screw or a water screw. The frame is suitably reinforced and includes a rudder which can be withdrawn from the water, to reduce its drag, when conditions are appropriate. Forward and rearward hydrofoils, of V-shaped configuration, are also provided for use at low speeds, a linkage being included for lifting the low speed hydrofoil above the water surface when appropriate vehicle speed has been achieved. Normally all hydrofoils depend from the frame below the floats, and levers are provided by which the occupant can vary the angles of attack of the hydrofoils to take best advantage of environmental conditions and vehicle speed.

Abstract: A boat comprising a tread drive system including pedals which are adjustable to the size of the operator. An axle extends through the bottom of the boat at the center of the tread system and is connected for oscillating movement therewith, the axle carrying at its lower end a horizontal swing arm. A vertical fin is mounted on the free end of the swing arm for pivotal movement relative thereto. The fin is a flat rigid plate which is tiltable between angular stops. The fin widens rearwardly and is confined by top and bottom baffles. The fin is arranged beneath the center area of the boat between an aft stabilizing fin and a front fin acting as a rudder whose pivot bearing may be coaxial with that of the tiltable fin. The aft stabilizing fin corresponds in size and shape to the rudder and is rigidly fastened to the bottom of the boat near its stern, preferably underneath the seat area for the operator. The boat is steered by a horizontal tiller or steering wheel joined to the upper end of the rudder shaft.

Abstract: A rudder assembly for marine craft wherein the main rudder carries one or more fins pivotable as well as lockable in relation to it, wherein the actuating and control devices for the fin are integrated with the rudder assembly.

Abstract: A self-steering system particularly suitable for maintaining a sailing craft such as a yacht on a preselected heading relative to the apparent wind. An oar member which forms a hydrodynamic servo is mounted on a center body for rotational motion. Also supported on the center body above the oar member is a wind vane which is mounted for rotational adjustment and for pivotal motion substantially normal to its rotational axis. The center body is pivotally supported on the transom of the yacht for motion about an axis approximately parallel to the longitudinal center line of the boat. The wind vane is coupled to the oar member such that when the heading of the yacht changes relative to the apparent wind, the wind vane is pivotally driven sidewise by the wind and through its linkage thereto rotatably drives the oar member.

Abstract: A minimum drag fluid reaction element including a rotatable shaft adapted to be supported by a vessel carried upon or within a fluid medium; and a rigid fluid reaction fin fixedly attached to the shaft for extension into the fluid medium, the shaft and the fin extending in opposite directions from a common intersection and forming an angle other than a right angle therebetween; the axis of rotation of the shaft lying in a plane generally normal to the fin whereby rotation of the shaft moves the fin through a path describing a right conical section. The angle between the fin and the shaft is preferably obtuse and the plane containing the axis of rotation of the shaft peripherally bisects the fin.

Abstract: A rudder assembly for a sailing craft comprising a housing adapted to be pivotally mounted on the stern of the craft for rotation about a substantially vertical axis, and a rudder pivotally mounted in said housing for rotation about a substantially horizontal transverse axis, means for holding the rudder in a downwardly projecting position and a rearwardly projecting position, said means comprising a roller urged into engagement with one of a plurality of indentations provided on said rudder.

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: The invention relates to the provision of an easily operated maneuvering device for sailing boats, which gives the boat in question a maximum of maneuverability also at low travelling speeds and without causing any flow resistance worth mentioning in connection with higher speeds. The device essentially comprises a rudder positioned in the stern of the boat and exhibiting a propulsion apparatus, the power direction of which coincides with the vertical symmetrical plane of the rudder.