Abstract: A device for maneuvering a watercraft includes a rudder trunk and a receiving shaft, wherein a first part of the rudder trunk is disposed in the receiving shaft in such a manner that there is an intermediate space between the first part of the rudder trunk and a wall of the receiving shaft. A second part of the rudder trunk projects from the receiving shaft, wherein the intermediate space has an apparatus for clamping the first part of the rudder trunk over a clamping height. A method for manufacturing a device for maneuvering a watercraft is also provided, wherein the manufacturing expenditure for the rudder trunk is reduced and the installation process of the rudder trunk is simplified.

Abstract: Rudder group (10) for boats (100) comprising a rudder blade (12) releasably coupled to a rudder pin (11), the rudder pin (11) being able to rotate along an axis (A) passing on the plane of the rudder blade (12) to define the forward direction of the boat (100), the rudder blade (12) also being connected in a rotatable manner to a support element (14) fitted onto the rudder pin (11) so that the rudder blade (12), when released by the rudder pin (11), can freely rotate between a lowered position, in which it is arranged longitudinally with respect to the rudder pin (11), and a maximum raised position in which it is substantially perpendicular to the rudder pin (11), in which the releasable coupling of the rudder blade (12) with the rudder pin (11) is obtained through a connection element (13) that can break at a predetermined load to free the rotation of the rudder blade (12) with respect to the support element (14).

Abstract: Rudder group (10) for boats (100) comprising a rudder blade (12) releasably coupled to a rudder pin (11), the rudder pin (11) being able to rotate along an axis (A) passing on the plane of the rudder blade (12) to define the forward direction of the boat (100), the rudder blade (12) also being connected in a rotatable manner to a support element (14) fitted onto the rudder pin (11) so that the rudder blade (12), when released by the rudder pin (11), can freely rotate between a lowered position, in which it is arranged longitudinally with respect to the rudder pin (11), and a maximum raised position in which it is substantially perpendicular to the rudder pin (11), in which the releasable coupling of the rudder blade (12) with the rudder pin (11) is obtained through a connection element (13) that can break at a predetermined load to free the rotation of the rudder blade (12) with respect to the support element (14).

Abstract: The present invention concerns an apparatus and method for attaching a ship rudder to a rudder shaft. The rudder shaft includes a cylindrical portion and an expanded flange part with a cylindrical portion, followed by a conical portion. The rudder includes a rudder element and a flange element for attachment to the rudder element. The flange element includes an internally cylindrical portion for mating, sliding and sealingly surrounding the cylindrical portion of the rudder shaft and an internally cylindrical portion for sliding, mating arrangement around the cylindrical portion of the flange part of the rudder shaft. The rudder element also includes a conical opening for mating attachment to the conical portion of the conical portion of the rudder shaft. It is provided channels for applying hydraulic pressure between the expanded flange part of the flange element, and means for tightening the flange element to the rudder element.

Abstract: A device for maneuvering a watercraft includes a rudder trunk and a receiving shaft, wherein a first part of the rudder trunk is disposed in the receiving shaft in such a manner that there is an intermediate space between the first part of the rudder trunk and a wall of the receiving shaft. A second part of the rudder trunk projects from the receiving shaft, wherein the intermediate space has an apparatus for clamping the first part of the rudder trunk over a clamping height. A method for manufacturing a device for maneuvering a watercraft is also provided, wherein the manufacturing expenditure for the rudder trunk is reduced and the installation process of the rudder trunk is simplified.

Abstract: A steering device consists of a towed steering surface or blade attached to a marine vessel by means of lines. It provides a method of steering the vessel in fluid. The blade is either rigid or non-rigid and may be supported by a framework. Control of the blade is by an attached lever/quadrant or by lines. Attachment lines and/or control lines can be configured according to the current invention so as to permit a lightweight construction of blade and/or light loads on the helm. The device can be designed as primary steering or as a form of emergency or reserve steering which can be deployed either with or without prior preparation of the vessel.

Abstract: A stop member (74; 174) is affixed to an elongated rudder blade (16) near its top and projects forward beyond the leading edge of the blade. A frame (62) in which the blade (16) is slidable lengthwise extends along a portion of the trailing edge of the blade and forward along the opposite sides. A separate mounting block (12) has a groove (48) receiving a portion of the leading edge of the blade (16). A pivot component (82) is mounted in the groove (48) for engagement against the underside (78) of the stop (74) when the blade (16) is in a normal upright steering position. A spring (52) is connected between the mounting block (12) and the frame (62) to bias the frame toward a position in which the blade (16) received therein extends in an upright steering position. From such position, the blade (16) can be swung upward and rearward, followed by forward translational movement through the frame (62) and along the mounting member (12).

Abstract: A stop member (74; 174) is affixed to an elongated rudder blade (16) near its top and projects forward beyond the leading edge of the blade. A frame (62) in which the blade (16) is slidable lengthwise extends along a portion of the trailing edge of the blade and forward along the opposite sides. A separate mounting block (12) has a groove (48) receiving a portion of the leading edge of the blade (16). A pivot component (82) is mounted in the groove (48) for engagement against the underside (78) of the stop (74) when the blade (16) is in a normal upright steering position. A spring (52) is connected between the mounting block (12) and the frame (62) to bias the frame toward a position in which the blade (16) received therein extends in an upright steering position. From such position, the blade (16) can be swung upward and rearward, followed by forward translational movement through the frame (62) and along the mounting member (12).

Abstract: Disclosed herein is a spade rudder, which is intended to relieve bending moment generated by a rudder, and to suppress vibrations generated from the rudder due to a propeller, in the case of a large ship. The spade rudder has a rudder stock for rotating a rudder, and a vertical bearing provided on a side surface of the rudder stock. The spade rudder further includes a stock gudgeon provided on a side surface of the vertical bearing, a horizontal bearing provided under the stock gudgeon, and a horizontal bearing housing provided at the junction of the rudder stock and the horizontal bearing, which are at right angles to each other, and dispersing a bending moment acting on the rudder.

Abstract: A kick-up rudder mechanism for small, tiller-steered sailboats. The rudder has a two-position pivot that allows the rudder to kick up and drop back down automatically when it hits and then clears an underwater obstacle; to be raised and lowered manually with fore-and-aft motion of the tiller; and to be secured against unwanted kick-up with a vertically releasable fore-aft locking connection between the tiller and the rudder housing.

Abstract: The present invention concerns an apparatus and method for attaching a ship rudder to a rudder shaft. The rudder shaft includes a cylindrical portion and an expanded flange part with a cylindrical portion, followed by a conical portion. The rudder includes a rudder element and a flange element for attachment to the rudder element. The flange element includes an internally cylindrical portion for mating, sliding and sealingly surrounding the cylindrical portion of the rudder shaft and an internally cylindrical portion for sliding, mating arrangement around the cylindrical portion of the flange part of the rudder shaft. The rudder element also includes a conical opening for mating attachment to the conical portion of the conical portion of the rudder shaft. It is provided channels for applying hydraulic pressure between the expanded flange part of the flange element, and means for tightening the flange element to the rudder element.

Abstract: A remote powered propulsive device having a rudder which carries a propeller or oscillating fins which are powered by pedals alone or with hydraulic assist or by an electric motor.

Abstract: A high performance full spade rudder for ships includes a rudder blade, a rudder trunk and a rudder post. The rudder blade widens from the leading edge to a central area which constitutes the widest point of the rudder profile. The rudder blade profile tapers from the central area to a narrow rear area and widens again from the rear area to the trailing edge. A bearing is placed in an inner longitudinal bore of the rudder trunk for bearing the rudder post, wherein the bearing penetrates with its free end into a recess, taper or the like in the rudder blade. No bearing is provided between the rudder blade and the rudder trunk. The bearing for the rudder post is placed in the rudder trunk in the area of the free end of the rudder trunk.

Abstract: In a rudder for ships composed of a rudder blade with a rudder post (40) held and supported in a rudder trunk (20), the rudder trunk (20) is made of a fiber composite material and is inserted into a nautical outer trunk tube (90) made of steel or of another appropriate material prepared by a shipyard, extending into the lower edge of the head box and inserted into the rudder blade (30). After alignment of the rudder trunk (20) in the nautical trunk tube (90), the intermediate space between both components (20, 90) is cast with a cast resin, or both components (20, 90) are bonded together.

Abstract: A retraction system for rudders for small boats having a deck comprising a rudder means connecting said rudder to the rear of a boat enabling said rudder to pivot on an axis such that when the rudder is retracted, it rotates upwardly through about 270° from the normal operating position in the water while twisting about 90° so as to lay essentially flat on said deck.

Abstract: The rudder post (40) for rudders for water vehicles has end sections (41, 42) made of a metallic material, in particular of wrought iron, and a mid post section (45) made of a nonmetallic material connected with the end sections so that the rudder post has a relatively low weight even for a very big length by maintaining a high flexural strength and torsion stiffness.

Abstract: A retraction system for rudders for small boats having a deck comprising a rudder means connecting said rudder to the rear of a boat enabling said rudder to pivot on an axis such that when the rudder is retracted, it rotates upwardly through about 270° from the normal operating position in the water while twisting about 90° so as to lay essentially flat on said deck.

Abstract: This invention can be fitted to a variety of vessels and accommodate a variety of accessories that may require deployment or retraction such as electronic equipment, downrigger or an outboard skeg mechanism as detailed in the preferred embodiment. This invention in it's preferred embodiment is shown on, but not limited to, the stern of a kayak. It increases the efficiency of linear tracking, allows the handling characteristics of an aquatic vessel to be tuned, and reduces the amount of technical skill required to control the vessel. It can have control linkage to deploy or retract it, can be stowed separate from the vessel, is lightweight, and is easy to assemble and operate.

Abstract: An improved rudder system and pedal system for use in a watercraft such as a kayak. The rudder assembly includes a rudder housing having a push rod operably linked to a rudder blade positioned in the housing. A rudder control cord passes through a fairlead located at the top of the push rod and terminates at the trailing edge of the rudder blade. Upon tensioning of the rudder cord, the push rod acts against a notch in the leading edge of the rudder blade, which causes rotation of the rudder blade in addition to the rotational force on the trailing edge of the rudder blade due to movement of the control cord. A feature of the rudder assembly is the incorporation of a spring element in the rudder blade that provides an extension bias to the rudder blade, and user selectable pre-loading thereof for varying the rotational bias. The pedal system includes a toe control pivotally attached to a foot brace that is slidingly located in a track.

Abstract: A water craft attached to a self-deploying rudder assembly for use with an exhaust port having a exhaust stream operating at a selected thrust level includes a mounting assembly and a pivoting rudder blade assembly. The mounting assembly typically includes a mounting ring for attachment to the exhaust port, along with a storage skeg. The pivoting rudder blade assembly typically includes a thrust plate attached to one end of a rudder shaft, with a rudder blade attached to the other end of the shaft. Some deployment means, such as a spring, is used to urge the thrust plate into the exhaust stream when the selected thrust level is below a preselected thrust level. However, when the selected thrust level is above the preselected thrust level, the thrust plate is moved out of the exhaust stream and the rudder blade is thereby moved from a deployed, operational position to a stored position within the skeg.

Abstract: An improved rudder for tiller steered sailboats is disclosed wherein a rudder support member is rotatably mounted on an axial support located substantially at the waterline in the aft central portion of a boat. A rudder support guide or track is preferably mounted at a radius defined by the rudder support from the axial support and both supports and locks the rudder support at a desired angle so that the rudder may be maintained at a desired angle with respect to the surface of the water. A spring loaded locking pin preferably locks the rudder support at a desired angle and is attached via a cable to a remote hand release located at the distal end of the tiller for remote operation. A rudder level detection device is also disclosed for use with the present invention which determines the optimum angle of the rudder support of the present invention.

Abstract: A boat stabilizing rudder system is disclosed. A rudder is formed of planar sheet material positionable in a vertical orientation. A vertically positioned support rod has a lower end, an upper end and an elongated central extent therebetween. The lower end is formed with plates adapted to be coupled to the rudder. The upper end is mounted on a driven gear adapted for rotation about a vertical axis. A bracket has an aperture adapted to receive the intermediate upper extent of the rod beneath the gear for rotation of the rod with the rudder therebeneath about a vertical axis. Also included is a drive box with a motor, a driven shaft, and a drive gear in driving contact with the driven gear. The bracket also has an aperture therethrough with a first pivot pin constituting a hinge. A pivot box has horizontally disposed second apertures therethrough with a second pivot pin positioned through the second apertures. A positioning rod has an exterior end with an outboard aperture receiving the first pivot pin.

Abstract: A rudder assembly for a boat in which a rapid pivotal displacement of the tiller from a first position to a second position displaces the rudder into either a raised or a lowered position, and which comprises a biased locking means for releasably retaining said tiller in a first position.

Abstract: A method of constructing a rudder comprises the steps of producing two female moulds each having the shape of half the rudder and stock, moulding in each mould one half of the blade and stock portions (11, 12) of the rudder, removing the moulded halves from the female moulds, placing the two moulded halves in face contact with each other and then securing the two moulded halves together to form a rudder having integral stock and blade portions (11a, 12a).

Abstract: A rudder mechanism for a ship comprises a support bearing fixed to the bottom of a stern of the ship, a rudder shaft with one end rotatably supported by the support bearing, a swayable shaft member connected to the other end of the rudder shaft, and a rudder wing connected to the swayable shaft member and disposed behind a propeller of the ship. The swayable shaft member and rudder wing form a swayable wing portion swayable in a ship backward direction. The swayable shaft member comprises a projection fixed to the rudder shaft or the rudder wing, a projection receiver fixed to the other of them and engaged with the projection, and a rotatable shaft inserted into the engaged projection and projection receiver to enable them to sway relative to each other. The projection and projection receiver have restriction faces for restricting the swayable wing portion from swaying in a ship forward direction beyond a vertical position and from swaying in a ship backward direction beyond a maximum backward position.

Abstract: A sailboard including hull, mast and rigged sail assembly and a foot operated rudder pivotally and rotatably mounted to the stern of the hull, with the rudder being adjustable longitudinally to the different heights of sailboard users while maintaining the same or desired craft displacement of the sailboard regardless of the body and/or leg lengths of any user.

Abstract: A rudder assembly for use on a sailing vessel is disclosed wherein the rudder is bifurcated into a pair of downwardly diverging rudder vanes rotatably mounted on support arms extending transversely of the tiller post. As the sailing vessel is tipped sideways, one of the rudder vanes approaches a generally vertical orientation while the other rudder vane approaches a generally horizontal orientation. A restraining member is pivotably mounted on a mounting post affixed to the tiller post for movement therewith and is engageable with the rudder vanes to restrict movement thereof away from a stop member.

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 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 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 walker-sailor watercraft which can be used for either walking or sailing on the surface of a body of water includes separate right and left walker members, each walker member including a foot cavity, a support member, a hollow seat member and a storage member, a sail mounting platform which is fixedly connectable between the support members of the walker members and otherwise storable in the hollow seat member on one of the walker members, a sail structure which is mountable on the sail mounting platform and otherwise storable in the storage members of one of the walker members, and a rudder structure which is mountable on the trailing end of one of the walker members and otherwise storable in the hollow seat member of the other of the walker members.

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 demountable catamaran has a pair of inflatable hull structures each comprising an inflatable hull tube (4) and an extruded generally rectangular aluminium tubular beam (5) having at its lower surface two inclined support surfaces on opposite sides of a channel having a narrow entry. The hull tube (4) has an upstanding web extending through the entry to carry an enlarged bead (15) within the channel to lock the inflatable tube to the hull beam (5). The hull beams (5) are secured by demountable joints to cross beams (2) and (3). The seam of each hull carries a rudder assembly which can yield when the rudder hits an underwater obstruction.

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: 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: 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: 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 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 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: 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: A removable rudder assembly for a boat includes a generally key-hole shaped rudder lock member which is adapted to fit into a key-hole shaped slot in the keel of the boat adjacent the stern. A rudder shaft extends through the rudder lock member, and a rudder is mounted on the rudder shaft. A tiller is removably attached to the upper end of the rudder shaft. The rudder assembly is removed from the boat by detaching the tiller, removing the rudder lock member from the slot, and withdrawing the shaft rearwardly from the slot.

Abstract: A boat rudder comprises a rudder-blade hinged in its upper part to a substantially horizontal pin carried by a rudder-blade support, which support is hinged to a substantially vertical pin. The boat rudder further comprises a bar fixed to a bar support the rear part of which is hinged to the upper part of the rudder blade. A locking device, comprising a stop member carried by the bar support and a jamming member carried by the rudder-blade support, is provided for jamming the bar support in relation to the rudder-blade support. It is fitted with a balancing adjustment device for adjusting the normal working position of the rudder-blade and a longitudinal displacement arrangement for varying the distance between the stop member and the pin hinging the bar support to the rudder-blade.

Abstract: A supporting device is disclosed for an arrangement of articulated elements such as a fin-rudder arrangement, wing-trailing edge flap arrangement, and the like, for aircraft or watercraft. The disclosure more particularly relates to the cover for the gap existing between the two articulated elements. There is disclosed an arrangement of levers and bearing points which allow the cover to maintain a constant length and approximately constant curvature over its length as the two elements move relatively to each other. The arrangement of the disclosure eliminates corners and folds in the elastic cover without also requiring parts protruding beyond the elastic cover and without requiring high forces to deflect the cover.

Abstract: A rudder position return device for a boat rudder of the kick-up type comprises a U-shaped clip with lateral lugs, an elastic band to be stretched across the aft side of the rudder and be fastened to the clip at its fore side and a pair of dish-shaped washers to fasten on each side of the rudder above the band to act as stops for the band when the rudder is in a fully kicked-up position.

Abstract: A selected depth mooring system, such as a sensor package or mine, deployable to and maintainable at a precise depth relative to the surface. A cylindrical housing of flotation, submersible and anchor units connected in tandem are sequentially separated and deployed by cable from the surface to moor the submersible unit the desired depth from the anchor unit, and to release the flotation unit after deployment.

Abstract: A rudder assembly for small sailboats with a tiller which extends forwardly of a stock member and which is pivotally connected with a vertical rudder also pivotally connected to the stock member. The tiller pivot is spaced rearwardly and above the stock pivot with the rudder in its lowermost and operative position. An upright peg on the stock member respectively enters fore and aft slots in the tiller with the rudder vertical and swung upwardly to the horizontal, the latter position effected by swinging the tiller upwardly to disengage the peg from the fore slot and thereafter pulling the tiller forwardly and downwardly to enter the peg in the aft slot. A tooth on the tiller between the slots is selectively engageable with notches on the top of the peg to secure the rudder in intermediate positions.

Abstract: A recovery buoy which is carried underwater by a diver and comprises an indented spool-like body of lightweight material around which is wrapped a cord. A weight is detachably mounted to the body and is attached to the cord so that the weight end of the cord can be attached to a structure to be recovered or marked, and when the body is released, its buoyancy causes it to rise, thereby unspooling the cord.

Abstract: An apparatus and method wherein a pair of frame members each having four jacks and placed one upon another are provided with other jacks which are horizontally movable to change the relative position of the frame members, and the jacks are suitably operable sequentially to provide the frame members with a capacity to be moved freely within a dock, whereby a propeller or rudder for a large ship is held between a pair of scaffolds provided on the frame members and the article is then conveyed to the desired place and mounted in the desired position of the ship.

Abstract: A rudder is pivotably mounted in an integral rudder-tiller support having a spring-loaded detent engageable by a lock on the rudder which may be adjusted to change rake and which may be released to free rudder to swing on its pivot by moving detent out of locking engagement with the lock.

Abstract: A rudder lock for pivotally mounting a rudder on a boat and comprising a bracket attachable to the rudder, a pintle attached to the bracket, and a mounting member attachable to the boat and having an aperture sized to receive the pintle. A resilient lock element is carried by the mounting member and engageable with the pintle when the pintle is received in the aperture of the mounting member. Cooperating surfaces on the resilient lock element and the pintle retain the pintle against withdrawal from the aperture of the mounting member. The resilient lock element is resiliently movable to allow withdrawal of the pintle from the aperture.