Abstract: An electric watercraft, wherein the electric watercraft includes at least an electric propulsor configured to propel the electric watercraft in a fluid. Electric watercraft further include a plurality of battery packs located beneath a deck of the electric watercraft and configured to poser the at least an electric propulsor. Electric watercraft further include at least a drainage system configured to drain fluid from the deck, wherein the at least a drainage system further includes at least a drainage path having a drainage path inlet and a drainage path outlet, and the deck and the drainage path inlet are configured to flow fluid from a top side of the deck of the electric watercraft.

Abstract: A small watercraft system includes: a watercraft body; a watercraft body manipulation member through which a watercraft body manipulation command is input by an operator; a drive source that allows the watercraft body to plane; a steering device that allows the watercraft body to be steered; and a control device that controls the drive source and the steering device to operate the watercraft body. The control device determines whether a mode switching condition is satisfied, the mode switching condition including an operator's absence condition that the operator is absent from the watercraft body. Upon determining that the mode switching condition is satisfied, the control device executes an operator-absent manipulation mode in which the control device moves the watercraft body by controlling the drive source and the steering device based on an operator-absent manipulation command independent of the watercraft body manipulation command.

Abstract: A small planing watercraft with an imaging device includes: the imaging device incorporated in the small planing watercraft, and capturing an image of surroundings of the small planing watercraft; and a display device incorporated in the small planing watercraft at a location where the display device is recognizable by an operator of the small planing watercraft, and displaying the image of surroundings captured by the imaging device.

Abstract: An internal combustion engine includes a crankshaft that is rotatably supported on the crankcase, a cylinder block that is joined to the crankcase and defines a plurality of cylinders in a V-type arrangement in which the cylinders are disposed above a virtual horizontal plane including a rotational axis of the crankshaft and intersect each other at a bank angle, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that is mounted from an outside at a position, lower than the virtual horizontal plane, of a front face of the crankcase that receives air flow, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body. Thereby provided is a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision in a so-called V-type internal combustion engine.

Abstract: An internal combustion engine includes a crankcase that rotatably supports a crankshaft, a case cover that liquid-tightly covers a side of the crankcase, a cylinder block that is joined to the crankcase and divides a plurality of cylinders in a V-type arrangement in which the cylinders are disposed above a virtual horizontal plane including a rotational axis of the crankshaft and intersect each other at a bank angle, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that is mounted from the outside on the crankcase at a position higher than the virtual horizontal plane and is made to face a trajectory of the to-be-detected body to generate a pulse signal in response to movement of the to-be-detected body. This provides, in a so-called V-type internal combustion engine, a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision.

Abstract: Marine vessel propulsion systems and methods for controlling speed and direction of marine vessel propulsion systems. A processing device can receive, from a user device, a signal indicative of a desired direction and speed input to the user device; store the desired direction and speed signal in the memory; generate control signals indicative of a power input, wherein each of the control signals is associated with a particular motor of the marine vessel propulsion system; and transmit each of the control signals to a corresponding one of the motors to move the marine vessel in a desired direction and at a desired speed.

Abstract: A water propulsion electric powered water recreation surf board with an integrated water propulsion jet to provide additional thrust for maneuvers and different selectable thrust levels as needed during the maneuver. The water propulsion electric powered water recreation surf board includes a body having an upper surface and bottom surface and a water propulsion system integrated into the body including a water inlet on the bottom surface, and a water propulsion nozzle and propeller on the upper surface. An electric motor connects to rotate propeller for drawing water into the propulsion system and expels a pressurized column of water through the water propulsion nozzle. A removable rechargeable battery is connected with the electric motor and a controller with a user control pad on the top surface of the body to allow the user to control the operation of the water propulsion system.

Abstract: A jet propelled watercraft includes a watercraft body, an engine housed in the watercraft body, a jet propulsion unit that suctions and jets water with a drive force of the engine, a first exhaust pipe connected to an exhaust port of the engine, and a catalyst storage connected to the first exhaust pipe, wherein the first exhaust pipe and the catalyst storage are integral and unitary with each other.

Abstract: A personal watercraft comprises a body; a driving power source mounted in the body; a water jet pump driven by the driving power source to eject a water jet in a rearward direction; a handle bar gripped by a rider; a rider operation member provided on the handle bar, the rider operation member being operated by the rider to be movable to an acceleration position for providing a forward movement command, a deceleration position for providing a rearward movement command, and a neutral position for providing an idling command, the neutral position being set to a position between the acceleration position and the deceleration position in a movement path of the rider operation member; and a control unit which controls the driving power source in response to the rider's operation for moving the rider operation member.

Abstract: A stand-up type personal watercraft comprises a body including a deck and a hull; a standing deck provided at the deck and located rearward relative to an engine room; a pair of deck fins located on right and left sides of the standing deck, respectively, and protruding upward; a muffler through which an exhaust gas from the engine flows; a first exhaust pipe which guides the exhaust gas from the engine to the muffler; and a second exhaust pipe which guides the exhaust gas outside from the muffler. The muffler is placed below the deck fin located on one side, and accommodated in the hull. The first exhaust pipe extends rearward on the one side from the engine and is connected to the muffler. A portion of the second exhaust pipe extends in a forward and rearward direction inside the deck fin located on the other side.

Abstract: A jet propelled watercraft includes a watercraft body, an engine in the watercraft body, a jet pump configured to generate a jet thrust by a driving force of the engine, an intake pipe configured to supply air to the engine, an air intake box, and a filter. The air intake box includes a connecting port connected to the intake pipe and an inlet configured to take in ambient air. The filter is disposed in a space in an internal space of the air intake box. The filter divides the space into a lower region and an upper region. The lower region is connected to the inlet and the upper region is located higher than the lower region and connected to the connecting port. The filter is configured to clean air taken into the internal space from the inlet and directed to the connecting port.

Abstract: A jet propelled watercraft includes a front stopper that is disposed between a hull and an engine, that faces the hull across a space therebetween in an up-down direction, and that is made of an elastic material. The engine includes a crankshaft rotatable around a crankshaft axis, a crankcase that houses the crankshaft, a case cover attached to the crankcase, and a stopper attachment portion that is integral and unitary with the case cover and to which the front stopper is attached.

Abstract: An operation device of a straddle type vehicle includes a controller used to select multiple function menus of equipment incorporated in the straddle type vehicle. The controller has a rotary selection controller constituting a part of a grip portion, and provided adjacent to a switch box. A rotation detection portion is provided in the switch box, and detects rotation of the selection controller.

Abstract: A vessel includes a body including a hull and a deck, a float disposed on both right and left sides of the hull and extending in the front/rear direction along the hull, a propulsion unit that propels the vessel, a steering handle disposed above the deck, and a seat disposed at the rear of the steering handle on the deck. The deck includes a flat portion extending from the lateral side of the seat to the rear end edge of the deck.

Abstract: A self-propelled personal watercraft. The watercraft includes a hull with a middle narrower than a bow and a stern of the watercraft and with a bottom of the bow being raised with respect to the middle and the stern, and a propulsion device within the hull. While the watercraft is propelled through water by the propulsion device with a rider on board, shifting of the rider's weight to either side of the watercraft increases contact of the bow with the water on that side, the increased contact resulting in increased drag and turning the watercraft to that side. While the watercraft is propelled through water by the propulsion device with the rider on board and the watercraft is not turning, the bottom of the bow makes contact with the water across a narrower distance than the bottom of the middle.

Abstract: A vehicle for use on the water that can be propelled into the air above the water is provided. The vehicle can include a main body, a board provided on the bottom of the main body, a seat, an inlet for receiving a pressurized incoming water stream, a main nozzle positioned to direct a flow of water beneath the board, handlebars having handle conduits, each handle conduit ending in a nozzle for discharging a flow of water out of the handle conduit and rotatable relative to the vehicle, and conduits supported by the main body, the conduits connected to the inlet and positioned to route a first portion of the incoming water stream to the main nozzle and a second portion of the incoming water stream to the handlebars. The water stream can be supplied to the vehicle from an outlet on a personal water craft.

Abstract: A personal watercraft has a saddle with a seating surface, first and second opposite sides, and front and back ends. A pair of footing surfaces proceed from proximate lower edges of first and second opposite sides. A front recess is defined in the front end and has upper and lower portions that extend further away from the saddle than a medial portion. A back recess is defined in the back end and has upper and lower portions that extend further away from the saddle than a medial portion. The front and back recesses are configured to secure an inflatable body that substantially surrounds the saddle with the footing surfaces at least partially exposed.

Abstract: A Motorized Water Vehicle (MWV) adapted to operate as a fluid-compression station in addition to the primary transport function thereof. Such an MWV can supply compressed fluid to a third device. In a preferred and non-exhaustive manner, such an MWV can supply a passenger propulsion device allowing the propulsion device to move through the air or through a fluid. A propulsion system is thereby provided, in which a remote station is a motorized water vehicle adapted to engage with a propulsion device.

Abstract: A supercharged internal combustion engine is disclosed which includes a supercharger operatively connected to the crankshaft via a clutch supported by an intermediate shaft such that torque variations are partially absorbed by the clutch.

Abstract: A personal watercraft includes a hull, a deck, a steering handle, a steering shaft, a seat, and a display device. The deck is disposed above the hull. The steering handle is disposed above the deck. The steering shaft is arranged to extend downward from the steering handle. The display device includes a display portion and a switch. The display portion is disposed forward relative to the steering shaft. The switch is arranged to operate the display portion. The switch is disposed on a surface of the deck rearward relative to the steering shaft and forward relative to a central front end of the seat.

Abstract: A water motorcycle includes a motorized surfboard unit having a deck portion and driven by a drive motor, and a motorbike frame unit detachably mounted on the deck portion by means of retaining hook units. The motorbike frame unit includes a seat module provided with a rider's seat, and a handle module provided with an upright handlebar frame. The surfboard unit can be used independently for surfing or combined with the motorbike frame unit to function as a water motorcycle.

Abstract: A method for automatically controlling the speed of a ship, in which the engine speed (nMOT) is automatically controlled by a closed-loop engine speed control system as an inner closed-loop control system, the ship's speed (vS) is automatically controlled by a closed-loop ship's speed control system as an outer closed-loop control system, and the ship's set speed (vSL) is influenced as a reference input of the closed-loop ship's speed control system as a function of an external signal source. The ship's set speed (vSL) is corrected as a function of the underwater topography (TOPO).

Abstract: A personal watercraft includes a hull, a deck, a steering handle, a steering shaft, a seat, and a display device. The deck is disposed above the hull. The steering handle is disposed above the deck. The steering shaft is arranged to extend downward from the steering handle. The display device includes a display portion and a switch. The display portion is disposed forward relative to the steering shaft. The switch is arranged to operate the display portion. The switch is disposed on a surface of the deck rearward relative to the steering shaft and forward relative to a central front end of the seat.

Abstract: A supercharged internal combustion engine is disclosed which includes a supercharger operatively connected to the crankshaft via a clutch supported by an intermediate shaft such that torque variations are partially absorbed by the clutch.

Abstract: A lightweight watercraft device designed for use by general consumers and those without means or desire for a traditional, larger boat. The device comprises a pilot seat, an outboard electric motor and steering means mounted to a lightweight foam hull wrapped in a composite shell. The hull comprises a central region bounded by two forward sweeping sides that form the bow of the vessel. The sides taper from bow to stern, terminating at the rear of the boat in a squared configuration. The hull is a unitary foam structure, wrapped in plys of composite material for structural reinforcement. A plank board is bonded between plys along the central axis of the boat, and provides support for the seat, a rear transom board and an area for carrying supplies. Mounted on the transom board is the outboard electric motor, which provides motive power for the vessel.

Abstract: A water jet propulsion boat has a water jet propulsion device in a body, and is propelled by the water jet propulsion device. An electric unit having a waterproof structure and being separate from the body can be removably disposed in a storage section without using any tools. The storage section is defined by a recess provided in the body and being open upward.

Abstract: In a method for calibrating a system for controlling thrust and steering of a drive arrangement in a watercraft, the system includes an operating device adapted for indicating a requested direction of travel of the watercraft, the operating device being connected to a control unit for providing corresponding thrust and steering commands to the drive arrangement. The method includes receiving an activation command in the control unit, for beginning the calibration, detecting any movements of the operating device, storing values corresponding to the movements in the control unit together with corresponding thrust and steering values, and repeating the detecting step and the storing step until a termination command is received in the control unit, thereby using the stored values in subsequent operation of the operating device for indicating the direction of travel of the watercraft.

Abstract: A personal watercraft body comprises a recess configured to receive similarly shaped cassettes. A first cassette may be motorized to propel the body relative to a body of water. A second cassette may be non-motorized and may include a storage space therein for storing personal items. An insert may be disposed between the cassettes and the recess to orient and fit the cassettes within the body.

Abstract: This invention discloses three-layer rotomoulded motorboats having excellent floatability prepared from foamed polyethylene.

Abstract: The personnel water jet, or boat jets, haven't really change there design or function that much, and there very limited use. The flying water jet-flying submarine are able to fly above the rough water waves and always get a very smooth ride and the true feeling of true flight, jump in and out of the water or through the waves just like a flying fish and stay in flight for a while and also be able to go under water at any given time, with and adjustable impeller water flow tube that can rotate 360 degrees with fins, at any given time, and also giving the operator a much more creative and thrilling or spectacular ride every time, further more many more uses for personnel and professional operations, and with the impeller having continues fins or blade on the entire impeller its self, and this system will use less fuel in an average motor. Further more this is self energizing with the solar panels that are part or the body it's self with an ever lasting of fuel that will not harm the environment.

Abstract: The present invention is for an apparatus for use on a personal water craft having a hull, a deck disposed on the hull, a hood movably connected to the forward portion of the deck, an engine position within the hull, a seat mounted atop the deck for accommodating at least one rider and comprising: at least one multi-purpose rack is clamped to the personal water craft; wherein at least a portion of the multi-purpose rack is disposed forward of the seat; wherein at least a portion of the multi-purpose rack extends outwardly from the hood to a peripheral edge of the water craft; and wherein the multi-purpose rack has a surface for carrying one or more items. Wherein the multipurpose rack can hold and store items such as fishing equipment, camping equipment, water skies, wake boards, scuba diving equipment, and inner-tubes on the personal water craft.

Abstract: A personal watercraft has a hull and a deck. The deck includes a pedestal, two gunnels, two footrests, and a rear platform. A straddle-type seat is disposed on the pedestal. A steering assembly is disposed at least in part forwardly of the seat. An engine is supported by the hull. A propulsion system is connected to the hull and is operatively connected to the engine. A ballast tank is disposed at least in part on the rear platform. The ballast tank includes a rigid ballast tank body, and at least two apertures in the ballast tank body. A connector releasably connects the ballast tank to one of the hull and the deck. A pump fluidly communicates with one of the at least two apertures in the ballast tank body. A ballast tank having a generally L-shaped rigid ballast tank body is also disclosed.

Abstract: A personal watercraft is disclosed, having a hull and sub-deck (HSD) assembly with left and right gunnels. A deck is disposed above the sub-deck. The left and right lateral edges of the deck are disposed vertically at least as low as the upper end of the left and right gunnels. The left lateral edge and the left gunnel define a left gap therebetween. The right lateral edge and the right gunnel define a right gap therebetween. A left seal member extends laterally outwardly from the left lateral edge. The left seal member extends into the left gap generally toward the left gunnel. A right seal member extends laterally outwardly from the right lateral edge. The right seal member extends into the right gap generally toward the right gunnel.

Abstract: A watercraft with several stability and handling design improvements. It has an enhanced reactive suspension system positioned in the vessel between a set of separating hull and body components. The watercraft also has improved braking, steering and stabilizing systems designed around multiple pivoting mechanisms on the vessel hull that work individually or in unison to achieve the desired braking or steering effect. The stabilizing system is operated by a computerized, gyroscopic hydraulic control to maintain stability and comfort of ride, minimizing the roll, pitch and yaw commonly experienced in the passenger compartment.

Abstract: A power train configuration for an amphibious vehicle especially well suited for sit-astride applications. A prime mover drives a marine propulsion unit and/or at least one road wheel wherein the such road wheel is driven through a speed-change transmission. The speed-transmission is positioned above or below the axis of the prime mover's output shaft and preferably such that its input and output shafts are aligned at an angle of up to 90 degrees relative to the vehicle's longitudinal and lateral axes and/or the axis of the prime mover's output shaft.

Abstract: A small boat with a sponson for preventing splashing of spray onto the deck of the boat. The small boat is provided with a hull sponson at an outer periphery of the hull in order to fit the deck constituting an upper part of a boat body to the hull constituting a lower part of the boat body. A deck sponson is provided at an outer periphery of the deck, and the deck sponson is overlaid so as to bond with the hull sponson. The extent of projection of one member of the hull sponson and the deck sponson at the front section of the boat body is larger than the extent of projection of a member of the hull sponson and the deck sponson at a second member of the boat body. As a result, when the small boat is gliding and collides with a wave, the sponson prevents spray from the wave from splashing onto the deck.

Abstract: A watercraft bumper has an elongate body. The elongate body has a generally C-shaped cross-section. A protrusion extends from one of the end portions of the cross-section and extends towards the other end portion. A watercraft having the bumper is also disclosed. The watercraft has a lip over which the bumper is disposed. The lip has a depression formed in an upper side thereof. The protrusion of the bumper is disposed in the depression and is biased against the upper side.

Abstract: A steering system for a water vehicle includes a housing having a substantially cylindrical member, at least one case member extending through the substantially cylindrical member, a column shaft extending through the pair of case members, including at least one elongated hole disposed on opposed side of the column shaft, and being arranged to move relative to the pair of case members and the housing in an axial direction of the column shaft, and a telescoping mechanism partially disposed in the column shaft. One of the pair of case members includes a plurality of detents provided on an inner surface thereof. The telescoping mechanism includes at least one elongated hole disposed at one end portion of the telescoping mechanism, a locking pin extending through the at least one elongated hole in the telescoping mechanism and the at least one elongated hole in the column shaft, and a lever disposed at an opposite end portion from the one end portion of the telescoping mechanism.

Abstract: A supercharged internal combustion engine is disclosed which includes a supercharger operatively connected to the crankshaft via a clutch supported by an intermediate shaft such that torque variations are partially absorbed by the clutch.

Abstract: A boat includes a connection structure that connects couplings via a transfer shaft on a rear end portion of a crankshaft extending rearward from an engine. The crankshaft and the transfer shaft are connected by screwing an external thread and a front internal thread, and the transfer shaft and the couplings are connected by screwing an external thread and an internal thread. There are provided an inner bolt that strengthens the connection between the external thread and the front internal thread, an end bolt that strengthens the connection between the transfer shaft and the couplings, and an outer nut that strengthens the connection between the crankshaft and the transfer shaft. The boat can prevent movement between the crankshaft and an intermediate member and between the intermediate member and a coupling both in a rotational direction and in an axial direction without causing an increase of processing time or processing cost.

Abstract: A sports apparatus configured to support a rider upon the water surface is disclosed and may comprise either a compartment in the top surface configured to accept personal articles and a watertight cover to prevent damage and loss of personal articles or a propulsion source. The sports apparatus can have a V-shaped hull to add stability when used in the waves. The propulsion source is powered by either a combustion or electric motor that is controlled by a user interface on the board.

Abstract: The invention relates to shipbuilding and is directed at improving nautical properties of a device by increasing the stability thereof at rough maneuvers and by the possibility of hard dynamic breaking produced by using a reverse mode. The small-sized high-speed two-seat hydrocycle comprises a body, a water-jet propeller, a reversing-steering device in the form of a reverse drive pivotable shutter and a pivotable nozzle rudder, the hydrocycle operation control device connected to the engine and the reversing-steering device, driver and passenger seats which are arranged on both sides of center plane of the hydrocycle body along the boards thereof as low as possible with respect to the waterline of the hydrocycle. The hydrocycle operation control device is mounted between two seats and embodied mainly in the form of a joystick arm which is cinematically connected to the rudder and to a steering system which cinematically connects the engine control and the reversing device.

Abstract: In a personal watercraft with a watercraft body including a hull forming a bottom portion and a deck covering the hull from above, a magnet box is integrally combined with a battery storage tray. The watercraft also includes an engine disposed within the watercraft body, and a saddle-type seat disposed above the engine. A magnet box, including a main box body and a lid member, sealingly stores an electromagnetic starter switch therein, and is disposed in front of a battery storage tray, in order to reduce the distance between the magnetic starter switch and a starter motor. The main box body is formed integrally with a battery storage tray which is disposed in back of the engine and fixedly disposed on a floor portion of the watercraft body. The lid member is adapted to sealingly close the main box body of the magnet box in a fluid-tight manner.

Abstract: A personal watercraft is disclosed having a straddle-type seat. The seat is pivotally connected to the deck via a pivotal connection and pivotable with respect to the deck between a raised position and a lowered position. The pivotal connection has first and second links. The seat is pivotally connected to the first and second links and is pivotable with respect thereto about respective first and second axes. The first and second axes are movable with respect to the deck. When the seat is in the raised position, the seat permits access to the engine via an aperture in the deck. When the seat is in the lowered position, the seat covers the aperture in the deck and prevents access to the engine.

Abstract: A watercraft has steering force detection sections. Each steering force detection section includes a pressure receiving section. The pressure receiving sections are spaced from each other and are in the vicinity of a steering shaft. A pressing member is coupled to the steering shaft. The pressing member can press on at least one of the pressure receiving sections when the steering handlebars are rotated to a maximum steering angle. A received pressure detection section detects the pressure applied to the pressure receiving section. The pressure receiving section and the received pressure detection section are coaxially mounted in a pressure receiving section casing and a detection section casing. A guide tube can engage the pressure receiving section and the received pressure detection section. The guide tube is formed with ribs and grooves. The pressure receiving section has a pressure receiving member, a bolt, a plain washer, and a spring member.

Abstract: A personal watercraft has a hull, a deck disposed on the hull, a bin, and hood. The hood is operatively connected to the deck and is movable between an open position providing access to the storage bin and a closed position preventing access to the storage bin. An opening having a contour is provided in the deck forwardly of the watercraft's steering handles. The storage bin is disposed in the opening. The storage bin has a container disposed in the opening and a lid operatively connected to the container. The lid is movable between an open position providing access to an interior of the container and a closed position preventing access to the interior of the container. A storage bin to be used in combination with a personal watercraft is also disclosed.

Abstract: A display device of a personal watercraft is disclosed. The display device typically includes a memory configured to store a plurality of control modes for controlling components of the watercraft, a controller configured to control the components of the watercraft based on a control mode selected from the control modes, and a display portion that is provided in a display panel positioned in the vicinity of a steering handle of the watercraft and is configured to display operating information of the watercraft based on a signal from the controller while the watercraft is traveling. The display portion is configured to display mode information indicating the watercraft is controlled based on the selected control mode instead of the operating information when the controller controls the watercraft based on the selected control mode.

Abstract: In a personal watercraft with a watercraft body including a hull forming a bottom portion and a deck covering the hull from above, a magnet box is integrally combined with a battery storage tray. The watercraft also includes an engine disposed within the watercraft body, and a saddle-type seat disposed above the engine. A magnet box, including a main box body and a lid member, sealingly stores an electromagnetic starter switch therein, and is disposed in front of a battery storage tray, in order to reduce the distance between the magnetic starter switch and a starter motor. The main box body is formed integrally with a battery storage tray which is disposed in back of the engine and fixedly disposed on a floor portion of the watercraft body. The lid member is adapted to sealingly close the main box body of the magnet box in a fluid-tight manner.

Abstract: An air intake device for a watercraft adapted to suppress noise generating from an intake system of an engine and can obtain good intake efficiency. The air intake device includes intake ports opening to a side surface of the engine, and an air cleaner located on the rear side of the engine. An outlet of the air cleaner is connected through an intake passage to the intake ports of the engine. An air duct extends from an inlet of the air cleaner along the side surface of the engine to the position corresponding to the front end of the engine. The air duct has a front opening that faces downward.

Abstract: A personal watercraft having improved bottom hull shapes in general, and improved center keel shapes in particular. The center keel can have a substantial section over which the keel angle becomes sharper progressing from front to rear, and the concavities on either side of the center keel become deeper progressing from front to rear. The center keel can have a point of maximum downward slope on either side of the keel centerline, with the maximum vertically downward slope becoming greater with greater rearward distance over a section of the personal water craft bottom hull. The bottom hull can have keel troughs on either side of the keel centerline that become deeper over a section of the personal watercraft bottom hull, traveling from front to rear over that selected section of personal watercraft bottom hull. The center keel shape can provide a smoother ride and improved handling in rough water.