Abstract: A watercraft paddle has a composite structure of shaft components joined by adjustable joints enabling the shape of the composite structure and orientation of individual shaft components relative to other shaft components to be altered, a first paddle blade joined at a first outboard end of the composite structure, a second paddle blade joined at a second outboard end of the composite structure, opposite the first outboard end, and a first and a second grip region on the composite structure equally spaced to each side from center for a user to grip the composite structure to paddle the watercraft.

Abstract: The present disclosure provides a human-powered entertainment device. The entertainment device includes an inflatable base and a paddling component which is connected with the inflatable base, wherein the paddling component is adapted to swing when a force is imposed thereon, so as to perform paddling in water to make the human-powered entertainment device move on water. Accordingly, the entertainment device of the present disclosure can be driven to move and low in cost.

Abstract: A stand up paddleboard is provided. The paddleboard includes a base portion having an upper facing surface configured for being stood upon by a user and a downward facing generally flat planar surface and a support selectively engageable with the base portion and defining one or more pivot points for pivoting an oar about the pivot point during rowing. The paddleboard has a first configuration in which the support is not engaged with the base portion and second configuration in which the support is engaged with the base portion and extends in a generally upwardly direction from the upper facing surface of the base portion.

Abstract: The invention relates to a paddle device (10) for water vehicles, wherein a double or single paddle (2) is attached to a height-adjustable spar (1) so as to be movable in all directions, and the spar can be movably and detachably connected to the floating body (6) of a water vehicle, wherein the paddle device has a device (14, 16) for fixing the spar (1) in the direction of the bow and/or stern of the water vehicle; the paddle device (10) is used for force-saving paddling together with improved propulsion.

Abstract: A Forward Facing Rowing Apparatus and the associated vessel. The apparatus has a single attachment point and pivot assembly for supporting the oars. A built-in set of leaf spring elements reduce user effort by providing lifting force to raise the oar members. The apparatus is deployable on vessel hulls of virtually unlimited configuration, while still offering proper rowing leverage between the user's hands and the blades without the need for supplemental mounting systems or outriggers. The apparatus is stowable within the center area of the vessel hull. The positioning of the central pivot point for the oars can be adjusted along the axis of the vessel hull so that it can accommodate a wide variety of user preferences. An alternate design includes a foot-assisted sliding trolley mounting assembly that enables the user to add leg/foot power to the stroking motion. Furthermore, the apparatus is removable from the hull for transport or storage.

Abstract: A vehicle propulsion system having a mount; a rotation shaft oriented substantially normal to a plane of travel of a vehicle; a fixture coupled to the rotation shaft, the fixture being rotatable about a rotation shaft axis of the rotation shaft; and an oar assembly coupled to the fixture; wherein the coupling is coupled to the fixture, wherein the rotation shaft axis is substantially normal to the rotational axis; wherein the coupling is coupled to the fixture to permit rotation of the oar assembly about the rotation axis when the lock is locked.

Abstract: The invention relates to a paddle device (10) for water vehicles, wherein a double or single paddle (2) is attached to a height-adjustable spar (1) so as to be movable in all directions, and the spar can be movably and detachably connected to the floating body (6) of a water vehicle, wherein the paddle device has a device (14, 16) for fixing the spar (1) in the direction of the bow and/or stern of the water vehicle; the paddle device (10) is used for force-saving paddling together with improved propulsion.

Abstract: This embodiment relates generally to the Rowing Rig (30) for a suspended device (314), that may lead to the stabilization of a watercraft (32), such as kayaks and canoes, which allows an operator (316) to move and steer the watercraft (32) in a safe, ergonomic, and convenient manner. The rowing rig (30), with the example oarlock (40) adjustably connected to an outrigger (38), enables the support of and the counteraction of oaring forces imparted on oarlock (40), while allowing oarlock (40) to meaningfully adjustable in 3 independent axis relative to operator (316) location in watercraft (32). An inner guide system (52) can trap outrigger (38) in a secured position, or allow it to slidably travel within watercraft (32). The rowing rig (30) also allows the mounting of other systems, such as an anchor winch system, mounted to the base foundation (36) to counteract forces in deploying anchor.

Abstract: Disclosed is a device for facilitating direct arm-and-leg tandem (quadrimanual) production of the power stroke in forward-facing rowing that allows the placing of the oars into the water for the power strode and the clearing of the oars from the water in the recovery stroke to be done with the arms independently of the legs. Starboard side pivotable vertical axis (100 and port side pivotable vertical axis (11) provide the means for starboard side off-set pedal bar (4) and port side off-set pedal bar (5) to pivot in a horizontal dimension along with starboard side off-set oar (6) and port side off-set oar (7). By pushing forward on the off-set pedal bars and off-set oars denoted, one engages the power stroke in rowing the device. By moving said pedal bars and oars backward, one repositions the oars in the horizontal dimension during the recovery stroke for a subsequent power stroke.

Abstract: A mainframe for a float structure is described. The mainframe is detachably connectable to the dorsal surface of the float structure inflatables and comprises: a plurality of segmented and connectable cross-structure support members transversely attached to a plurality of segmented and connected longitudinal connector members via a connector member. Each of the longitudinal members and crossmembers may be made up of a plurality of detachable sections.

Abstract: A personal watercraft paddle mounting system includes a personal watercraft that has a hull and a top wall attached to the hull. The hull includes an aft portion and a bow portion. The top wall has an opening therein to receive a person. The opening is positioned between the aft and bow portions. A sleeve extends into the top wall adjacent to a forward edge of the opening between the opening and the bow portion. A mount is removably positioned in the sleeve and extends upwardly therefrom. A coupler is attached to the mount and is engageable with a double ended paddle to allow the paddle to rest on the mount while ends of the paddle are engageable with water to propel the personal watercraft.

Abstract: A pocket applied to a crate and formed to retain a paddle in an upright attitude. The crate is fixed to a stand up paddle surfboard to allow a board rider to stow the paddle in a manner that does not interfere with the rider during activities, such as fishing.

Abstract: A watercraft (1) includes at least two oar handles (3a, 3b) which are designated to be actuated by a passenger of the watercraft in order to propel the same. A considerably expanded functionality is achieved in such a way that the oar handles (3a, 3b) are connected to a control unit which controls at least one power-actuated driving motor (6a, 6b; 7; 16a, 16b; 26a, 26b) of the watercraft depending on the actuation of the oar handles (3a, 3b).

Abstract: A rowing boat foot support assembly is provided with a support member, a shoe attachment member and a release trigger mechanism. The support member is configured to be coupled to a rowing boat. The shoe attachment member is pivotally supported on the support member. The shoe attachment member includes a base portion and a movable fixing portion that is movably arranged with respect to the base portion between a shoe retaining position and a shoe releasing position. The release trigger mechanism is provided between the support member and the movable fixing portion to move the movable fixing portion from the shoe retaining position to the shoe releasing position.

Abstract: An improved oar that has an oarlock assembly, which holds the main oar shaft and parallel link in line with each other while allowing them to pivot fore and aft and up and down; an oar shaft; a parallel link; and a knuckle. The knuckle positions the handle via a sleeve, and the parallel link that is positioned by a pivot on the end of an arm. Additionally, there is a universal joint between the oar shaft and the handle, in line with the parallel link pivot, that allows the blade to be feathered while keeping the handle perpendicular to the rowing shell at every point in the stroke.

Abstract: An adjustable rigging system for a boat including a bracket adapted to connect to an outboard end portion of a stay mechanism for a boat, the bracket including a top hole and a bottom hole, wherein an axis is defined between a center of the top hole and a center of the bottom hole, a pin extending along the axis including two ends, each end removably connected to the bracket adjacent to one of the top and bottom holes, and wherein the location of at least one of the top and the bottom holes is adjustable to change a pitch of the axis and the pin.

Abstract: This is an apparatus to paddle a kayak, canoe, or other small watercraft, employing twin paddles, joined at the upper portion. A locating arm, connected to this juncture, and also to an anchor point at or near the bow, restricts fore/aft movement, in effect creating a “third hand”. In use, this allows paddling with reduced motion, effort, fatigue, craft yaw, and inboard water incursion.

Abstract: A paddle clip for a human powered watercraft, comprising a first flexible resilient portion with an opening to fit around the gunwale or cockpit rim of the watercraft. A second portion of the paddle clip includes a flexible portion for removably receiving a cylindrical shaft of an oar or a paddle used for propelling the watercraft. The paddle clip may further comprise at least one accessory clip for receiving an additional cylindrical shaft or an accessory. The paddle clip is configured to be quickly installed, repositioned or removed from the watercraft without tools or hardware.

Abstract: A manually-operable reciprocating rowing system having a reversible oar for forward or reverse propulsion. The oar has a plurality of pivoting blades mounted in a housing and movable between open and closed positions with each stroke of the oar. In the open position, the blades are positioned to allow water passage through the housing, while in the closed position, the blades are positioned to obstruct water passage through the housing. Gates are provided for stopping the pivoting movement of the blade at the blade housing. A reversing mechanism selectively pivots the gates to allow the blades to pass from one side to an opposite side of the housing, thereby allowing propulsion in a reversed direction.

Abstract: A water craft or canoe paddle device is provided for one-arm use. The paddle device enables a user to produce power strokes similar to strokes that are achieved with a traditional canoe paddle used by an individual using two unimpaired arms and two unimpaired hands. In one embodiment, one end of the paddle device for one-arm use is fastened to the upper torso, or shoulder area of the user. In a second embodiment, one end of the paddle device for one-arm use is fastened to the biceps area of the user. The design of the paddle shaft enables a user with one unimpaired arm to grasp the shaft of the paddle with their one unimpaired hand in substantially a perpendicular configuration to the shaft of the paddle. The power is achieved because the canoe paddle device for one-arm use design enables the large muscle groups of the shoulder, torso, back, and abdominal muscles to be utilized during each stroke of the paddle.

Abstract: Equipment for assisting in rowing a boat with oars comprising an active means (5) of receiving, storing and releasing energy, which receives the energy conveyed from the rower to the oar (4) during the return movement of the oar blade. The means (5) releases the energy with a certain degree of damping in order to prevent uncontrolled movement of the oar (4) during its forward movement.

Abstract: A new and improved leg assisted forward facing rowing system is disclosed wherein a rower applies leg power to propel a boat by means of a rope connected between his or her foot and an oar. A unique feature is a roller, fastened under the heel of the rower's foot, that rolls along the bottom of the boat supporting the weight of the rower's leg while the reciprocating motion of the leg is transmitted by rope going through pulleys to reverse the force applied to the oar. The oar is pivoted at the center of the boat above the rower's knees by a mechanism that includes provision for applying lifting force to support the oar weight thereby holding the oar blade out of the water when no force is applied. The rower's legs, back and arms simultaneously apply rowing force. Feathering at the end of a stroke and squaring action at the beginning are provided by wrist action to rotate the oar blade.

Abstract: This invention provides an attachment for inflatable watercraft such as inflatable rafts to render such watercraft more suitable for sports fishing. The attachment includes a swivelable seat mounted at a convenient height for fishing, oarlocks mounted at the optimum position for rowing while seated, and, in the preferred embodiment, means for deploying an anchor or drag to keep the watercraft in the desired location. The attachment is mounted on and supported by the gunwales of the inflatable watercraft, to distribute the weight of the attachment and its user over as wide an area as possible in order to enhance the stability of the watercraft in use.

Abstract: A rowing shell adapted for phase shift rowing, seating multiple groups of rowers such that all rowers within a group are seated for synchronous rowing, but each group is seated for asynchronous rowing with respect to the adjacent group. The phase shift rowing overcomes deficiencies encountered In boats supporting unison rowing, and provides greater average velocity for the same power input. The spacing provided between adjacent groups of rowers rowing out of phase is approximately twice or greater than the spacing between adjacent rowers rowing in phase within each group, wherein the spacing is defined by the distance between adjacent oarlock pins.

Abstract: Equipment for assisting in rowing a boat with oars comprising an active means (5) of receiving, storing and releasing energy, which receives the energy conveyed from the rower to the oar (4) during the return movement of the oar blade. The means (5) releases the energy with a certain degree of damping in order to prevent uncontrolled movement of the oar (4) during its forward movement.

Abstract: A paddle support for a vessel, such as a kayak or canoe. The paddle support includes an upright support member of adjustable length and a retainer at the top portion of the upright support member for retaining a paddle. The upright support member has an elastic cord that allows the paddle to extend past a predetermined set height to allow a rower a greater range of operation motion, while allowing return to the predetermined set height upon release of an external force.

Abstract: A paddle support having a storage device assists in rowing a vessel. The paddle is retained in the upper portion of a support that has a base section that may be connected to the storage device or a support strap. The storage device may rest directly on the floor of the vessel, or may be suspended over the opening of a vessel by a support strap. The storage device may be a backpack, bag, box or insulated cooler. The use of the support strap allows the storage device and support to be used with a watertight skirt or covering stretched over the opening of the vessel.

Abstract: A paddle support assists in rowing a vessel. The paddle is retained in the upper portion of a support that has a base section that rests, preferably unattached or at least readily releasably attached on the floor of a vessel. The support allows the paddle to be freely manipulated unencumbered by attachments to the vessel. The paddle support may be attached to webbing suspended across an opening in the vessel so that a base of the support is attached near the center of the webbing. The paddle support may also be attached to a harness suspended across an opening in the vessel so that the upright support is attached near the center of the harness. The use of the webbing or harness facilitates use of the support with a watertight skirt or covering stretched over the opening of a vessel.

Abstract: Device for removably securing an oar (3) to an edge of a boat, comprising an oarlock (4) accommodating a coupling member secured to the shaft (6) of the oar (3); the oarlock (4) comprises a base (7) supporting, via a spindle (22), a pivoting transverse arm (12) which has a cylindrical housing (13) opening into its front end (14) and locking means which have, to the rear and along the axis of the orifice of the housing (13), selectively a section provided with a hole (15) of the same diameter as the housing and a section provided with a hole (16) of a smaller diameter; a pivot (17) secured radially to the shaft (6) of the oar (3) having the same diameter as the housing (13) and hollowed by an annular groove (18) of a diameter equal to the smaller diameter of the locking means.

Abstract: A paddle support having a storage device assists in rowing a vessel. The paddle is retained in the upper portion of a support that has a base section that may be connected to the storage device or a support strap. The storage device may rest directly on the floor of the vessel, or may be suspended over the opening of a vessel by a support strap. The storage device may be a backpack, bag, box or insulated cooler. The use of the support strap allows the storage device and support to be used with a watertight skirt or covering stretched over the opening of the vessel.

Abstract: According to one aspect of the invention an aquatic propulsion device is provided comprising a harness to be worn on the body of a person, at least a first elongate member, and at least a first paddle. The first elongate member has first and second opposed ends and a first grip. The first end is pivotally securable to the harness. The first paddle is secured to the second end of the first elongate member. The first grip is positioned so that a person, when wearing the harness, can reach and hold onto the grip with a first hand and move the first grip so that the first elongate member and the first paddle pivot relative to the harness.

Abstract: An oarlock (26) for a rowing shell (42) is threaded onto an adjusting tube (10) longer than the oarlock and just shorter than an oarlock pin (16). This oarlock/tube assembly is slipped over the pin and secured so that it is free to pivot. The pin is attached to a sill (28) of a rigger (32). Manual turning of the tube will raise or lower the oarlock without disassembly to make adjustment for height and weight of rowers or changing water conditions.

Abstract: The watercraft has an elongated hollow hull having a pair of integral outwardly and upwardly projecting outrigger wings, onto which are mounted oar mounting devices each having a flat casing attached to rods protruding out of the outrigger wings. The attachment of the casing to the rods is accomplished with sockets installed on the rods, which have spherical housings engaged by ball joint portions provided on the casing, to form a ball and socket joint. The sockets are longitudinally spaced-apart on the hull side edge portion, so as to allow the casing to swivel about an axis parallel to the watercraft longitudinal axis. The casing is engaged by a pair of oar members pivoted therein in the plane of the flat casing. A pair of wires interconnect the pivoted oar members inside the casing, to allow pivotal displacement of the oar members only in opposite directions.

Abstract: A new and improved leg assisted forward rowing system wherein a user can mechanically advantage the rowing of a boat by first pushing his foot forward along a foot glide member which is slidably engaged within a first track member. This force is transferred to the oar via a pulley belt system that engages both the foot sliding mechanism and an oar movement mechanism. The oar movement mechanism comprises an oar glide member that is forced by the pulley belt system to slide within a second track member in the opposite direction of the foot sliding mechanism. Attached to the oar glide member is an oar support mechanism in which the handle of an oar is received within an oar lock having a downwardly extending stem. The oar lock stem is slidably received by a stem support member that allows the stem to slide upward and downward therein. Additionally, the oar lock is dimensioned to allow movement of the oar handle; however, this movement may be controlled/restricted by the insertion of filler material (i.e.

Abstract: The present invention is a mounting bracket for use with a kayak having a deck and a paddle having a median portion and a blade portion. In one embodiment, the bracket comprises first and second sides, first and second ends, an upper support surface adapted to receive the median portion of the paddle, a lower mounting surface adapted to engage with the deck of the kayak, and a strap disposed within a channel formed in the lower mounting surface. The strap is moveable from a first position whereby the median portion of the paddle may be removed from the upper support surface to a second position whereby the median portion of the paddle is secured within the upper support surface. The mounting bracket of the present invention allows quick and secure attachment of the paddle to a kayak for assisting in the re-entry of the kayak and can be easily mounted to a variety of kayaks.

Abstract: A canoe attachment includes a frame made of cylindrical members arranged in a substantially rectangular configuration. A seat is suspend between the forward frame member and the rearward frame member. A "forward-facing" rowing assembly is rotatably mounted on each of the opposite side frame members.

Abstract: Device for attaching an oar (3) to the peripheral inflatable cushion (1) of an inflatable dinghy, characterized in that it comprises: a base (5) secured to the inflatable cushion (1) and having a retaining head (7), and a fastener (4) comprising, on the one hand, a mounting root shaped to complement the retaining head (7) so that it can be clipped removably onto this head and, on the other hand, above the said root, a ring (11) that can be deformed elastically in the radial direction and is shaped to grip tightly and elastically around the shaft (12) of an oar (3).

Abstract: An inflatable boat comprises an inflatable body, at least one inflatable wing member and at least one holding device. The inflatable wing member is attached onto the inflatable body, while the holding device is connected to the inflatable wing member. Furthermore, the inflatable wing member has a rowing plate on which at least one check valve is provided. The inflatable boat can go ahead on a surface of water when the inflatable wing member is pulled by the holding device to paddle the water.

Abstract: Improvement to boat rowing in which the oars are upwardly biased, rotationally biased and forwardly biased to lift out of the water, rotate into the feathered position and swing to the front of the boat when at rest. A cord, attached to foot pedals, pulls the oars into the vertical position, down into the water and rearward in the water for the power stroke. Oars may be operated by hands only, by feet only or by hands and feet.

Abstract: An apparatus for use in forward facing rowing of a boat having oars mounted ahead of the oarsman and having a seat fixedly secured in the boat is disclosed. The apparatus comprises an inboard support assembly and an outboard support assembly. The outboard support assembly is connected to boat oars for pivotal movement of the oars with respect to the outboard support assembly in at least horizontal and vertical planes, and also allows rotational movement of the oars with respect to the outboard support assembly. The inboard support assembly is comprised of a mounting bracket slidably secured within the boat, as well as a first elongate support and a second elongate support, both of which are pivotally attached to the mounting bracket for horizontal movement of the first elongate support and the second elongate support.

Abstract: A support for boat oars to hold the oars in a fixed stationary and at rest position without the use of the rower's hands. The support is of particular use in a single sculling boat and consists of securing oar straps fastened to a bar. An overall riser rod assembly is formed by placing upper and lower riser rods on a connecting rod. The overall riser rod assembly is pivotally connected at one end to a plate attached to the bar and, at the other end, to a plate attached to a mounting bracket. The mounting bracket is fastened to the structure of the boat. The overall riser rod assembly can be adjusted in length to conform to various boats and rowers. The support is easily lowered to an out of the way location when not in use.

Abstract: A multi-functional accessory arrangement for converting a sail board into a paddling craft, rowing craft or conventional sailing craft consisting of a sail board hull having a multi-functional seat including an associated back support adapted to be adjustable between a sailing/hiking position, rowing position and paddling position said seat connected to the sail board hull permitting movement of the seat between a forward position and an aft position, a multi-functional propulsion kit for selectively transforming the sail board into a sail boat, a row boat or a kayak board said kit including a hiking device connected to the chassis for use in counter balancing heeling of the hull responsive to the action of wind acting on the sail, a pedestal console for controlling the movement of the sail board including a centerboard, a manual steering device with rigging for controlling a sail, oar locks for use with oars and boom.

Abstract: A small self-propelled watercraft having a main hull and an outrigger hull that is powered by a fin like oar arrangement. The main hull seats the rider and provides the substantial portion of the buoyancy for the watercraft. The fin like oar arrangement includes a blade type fin that is supported for pivotal movement at the end of the oar and the degree of pivotal movement can be adjusted from the handle end of the oar. In addition, the fin like blade is supported for movement between forward and reverse thrust positions and this movement is also controlled at the handle of the oar.

Abstract: An oar stop sound dampener which minimizes the sound produced during the rowing of a boat. It is composed of a flexible, solid, closed-cell foam and is placed on the shaft of the oar adjacent to the oar stop on the side toward the paddle. The dampener is a disk having an aperture at its center to accommodate the shaft of the oar and having a segment adjacent to such aperture which segment can be removed from the disk to provide space for the elongated member some oar stops have extending along the shaft of the oar toward the paddle. By keeping the oar stop, which is usually metal, from contacting the oar lock, which is customarily also metal, through the location of the disk and its resistance to compression, and because of the flexible nature of the disk, no discernible sound is produced during rowing; and wear of the oar stop and oar lock is minimized.

Abstract: An apparatus for forward facing rowing of a boat is disclosed. An elongate outrigger support extends outwardly from a mounting point in the boat and has an end adjacent to the mounting point around which the elongate outrigger support pivots horizontally. An outrigger support and handle connector sleeve is slidably mounted over the elongate outrigger support. An elongate handle is pivotally connected to the sleeve to allow the elongate handle to pivot relative to both the sleeve and the outrigger support. A handle and oar connector attaches the outboard end of the elongate handle to an oar within the midsection of the oar. A rotation transfer mechanism in the handle and oar connector causes corresponding rotation of the oar upon rotation of the elongate handle. The handle and oar connector transfers, from the elongate handle to the oar, pivotal and rotational movement as the elongate handle rotates, as well as moves along and pivots around the elongate outrigger support.

Abstract: Apparatus for propelling a boat in the direction in which the oarsman is facing using oars which are connnected to a support (80) at their innermost ends (18) so that they are movable rotatably in a horizontal plane, rotatably in a vertical plane and linearly up and down, and which are suspended above the water by a downward force from a compression spring (66) applied at a point inboard of a fulcrum (74) which is attached to the oar connection joint clevis (46) and which is supported by a horizontal bearing surface (72) on which the fulcrum (74) slides as the oar is moved.

Abstract: A river raft comprising a first solid pontoon having a hollow interior and a second solid pontoon also having a hollow interior. The first and second pontoons are connected together in a manner so as to define a central portion between the pontoons. The central portion has a depth of less than that of the first and second pontoons. Hatches are formed through the first end second pontoons so as to provide access to the hollow interiors. These hatches are detachably mounted to the upper surface of the pontoons. The first and second pontoons are of a symmetrical configuration. A spar tube connects these symmetrical configurations of pontoons such that the pontoons are maintained in fixed juxtaposition against one another. The first and second pontoons are made of a roto-molded plastic material. The central portion of the raft includes a plurality of openings extending therethrough. These openings are suitable for the receipt of ice chests, water bottles, and other items.

Abstract: This invention relates to a device for suspending a double-ended paddle which is used to propel a small water craft. The device can be readily disassembled and stored and has particular application to kayaks. In the preferred embodiment of the invention the paddle is supported by an elastic member attached at its midpoint. The elastic member depends from a freely swinging overhead boom which projects from a mast mounted to the water craft in front of the paddler. The paddle location and paddle lifting force can be adjusted.

Abstract: An oarlock comprising a pin adapted to be mounted for pivotal movement about a generally vertical axis, the pin including an upwardly facing surface and an upper portion located above the surface, and an oar supporting member mounted on the upper portion of the pin for pivotal movement relative thereto about a generally horizontal axis the oar supporting member including a lower end surface located above the upwardly facing surface of the pin, the lower end surface including a portion which is spaced from the upwardly facing surface so as to permit pivotal movement of the oar supporting member about the horizontal axis, and a portion which engages the upwardly facing surface in response to pivotal movement of the oar supporting member so as to limit pivotal movement of the oar supporting member about the horizontal axis.

Abstract: A knock-down boat assembly comprises bow, mid and stern water-tight transverse hull sections, each having fore and aft ends, concave side walls and a transverse bulkhead at the aft end of the bow section, at the fore and aft ends of the mid section and at the fore end of the stern section. The stern section is nestable in the mid-section and the bow section is nestable in the stern section when in the knock-down configuration. The forward bulkhead of the stern section is secured in a position butting against the aft bulkhead of the mid-section and the aft bulkhead of the bow section is secured in a position butting against the fore bulkhead of the mid-section when the boat is assembled for sailing.