Abstract: An aluminum hull boat includes a running pad formed through an extrusion process. The running pad includes a lower planing element at least a portion of which is in contact with the water when the boat is at planing speed, and opposed sidewalls which attach the running pad to the boat's undersurface. The extrusion process efficiently produces a running pad that is highly rigid and uniform with relatively sharp outer edges that allow water migrating from beneath the running pad to break cleanly off and away from the running pad, thereby eliminating hydrodynamic drag and improving the boat's performance characteristics.

Abstract: A boat hull comprising a bottom panel that makes up the bottom of the boat hull. A first chine member has a base edge and an extended edge. The first chine member is coupled to the bottom panel at the base edge and protrudes generally in a vertical direction away from the boat hull. A curved member couples the extended edge of the first set of chines to a set of side panels. The set of side panels extend from the curved member to the gunwale making up the sides of the boat hull. A second set of chines are located on the set of side panels of the boat hull and extend in a horizontal direction away from the boat hull.

Abstract: Spaced cambered wedges having flow diverting surfaces thereon are deployed from retracted positions within the smooth surfaced sides of a marine vessel hull undergoing water travel above a high speed, under which air ventilated cavities are established by the deployed wedges along the sides of the hull, imposing drag on the hull sides of a substantially reduced magnitude as compared to that otherwise imposed directly by the water alone.

Abstract: The invention concerns a motorboat with a skimmer hull. The hull is a W-shaped cross section and comprises an inverted V-shaped longitudinal central tunnel formed by two median faces of the hull and extending substantially over all the length of the hull, the vertex of this tunnel being level with the waterline.

Abstract: Presented is a highly efficient and stable ship concept that is at least partially supported by an artificially produced gas cushion(s). Addition of a stern bustle aft of the gas cushion(s) improves hull efficiency. Special location of water inlets for waterjet propulsors allows the inlets to take in the ship's boundary layer to thereby enhance the waterjet's efficiency. Other features of the invention include an aft stabilizer that can have trim capabilities, a forward stabilizer that can include trim capabilities and that can also provide an expansion of gas cushion area, and forward stabilizing fins that can retract into the gas cushion recess which is an advantage when operating in shallow water or near docks. A further enhancement includes water deflectors disposed mainly in a gas cushion recess(es) whereby impingement of a bow wave on such water deflectors adds to the overall lift and hence efficiency of the ship especially at low to medium speeds.

Abstract: A float having symmetrical fore-aft and port-starboard cross sectional surfaces in the shape of multiple, above- and below-centerline, ellipsoids is hydrodynamically-contoured to support suspended devices, typically a seismic air cannon, at even height/depth in the water, and at even attitude (roll, pitch and yaw). The float places nearly constant force on the tow line over a broad range of tow speeds from at least 3 to 12 knots during sea states from 0 to 6 and in the presence of variable direction surface winds to 25 knots. The float transitions easily and smoothly from displacement to hydroplaning operational modes, permitting that seismic equipment may be towed smoothly and at even depth in the water even at high speeds, thus accelerating seismic surveys. The preferred fore-to-aft contour of the lower surface is in the substantial shape of an ellipsoidal surface of from 4-10 feet, and most commonly 7 feet, in length with a height of from 6-14 inches, and most commonly 10 inches.

Abstract: A boat hull comprising a bottom panel that makes up the bottom of the boat hull. A first chine member has a base edge and an extended edge. The first chine member is coupled to the bottom panel at the base edge and protrudes generally in a vertical direction away from the boat hull. A curved member couples the extended edge of the first set of chines to a set of side panels. The set of side panels extend from the curved member to the gunwale making up the sides of the boat hull. A second set of chines are located on the set of side panels of the boat hull and extend in a horizontal direction away from the boat hull.

Abstract: A hull for a planing type watercraft has a rear portion that includes one or more steppers and a step plate fixed to the hull rearward of the first stepper so as to create a gap between a leading end of the step plate and the corresponding stepper. The step plate may additionally include longitudinally extending channels. The gap may further include apertures to supply air to the gap.

Abstract: The power boat includes a bow and a stern, a hull with a longitudinal dimension extending from the bow to the stern, and a platform extending across the stern for enabling boarding of the boat, the platform being located at or slightly above the water surface when the boat is stationary in the water. The hull has a planing zone located at a stern region of the hull shaped so that a longitudinal line extending along the surface of the hull from the bow to the stern upon reaching the planing zone turns upwardly towards the water surface relative to the longitudinal line forwardly of and before reaching the planing zone. When the boat is travelling through the water at speed, drag of the water travelling relatively along the planing zone assists stable travel of the boat through the water. The planing zone is located below the boarding platform.

Abstract: A performance aluminum vee boat hull with a concave bow section, elongated, parallel strakes, a central keel and a triangular shaped, substantially flat pad adjacent the transom and between the innermost strakes that increases the top speed of the boat and adapts the same to easily handle 150-200 horsepower engines.

Abstract: A hull is described having bow, stern, port and starboard sides. At least one chine extends longitudinally from a first point near the bow to a second point near the stern of the hull. At least one wedge section is disposed along the at least one chine and is adapted to minimize porpoising of the hull when in operation. A boat having such a hull is also described.

Abstract: An improved planing watercraft hull having reduced surface area in contact with the water resulting in a minimization of drag said hull capable of being adapted for use with a small, easily transportable waterjet propelled watercraft.

Abstract: Provided is a hull shape of a personal watercraft which can enhance speed performance, and still more, can also reduce rolling of a body. A bulging face 12 is formed on an outside part of a rear portion of a hull bottom 20 having a substantially V-shaped cross section and protrudes downward from an outside front face 20a positioned in front of the outside part. The bulging face 12 includes a fore part 13 inclined downward in the rearward direction, and a rear part 14 positioned above a virtual face A extended rearwardly from the fore part 13.

Abstract: A skidplate projecting into a body of water from a marine craft hull has a symmetric wedge formation extending from the leading edge to differently profiled surfaces on opposite sides of the skidplate producing lift and side force during travel. No side force is however produced during straight line travel by virtue of ventilated cavity enclosure of the profiled surfaces on both sides between cavity establishing streamlines extending through the water from the symmetric wedge formation.

Abstract: Improvement in water craft of single-hull type or multi-hull type and having a drive apparatus or a hub (7) carrying a ventilated propeller (6) of so called “surface piercing” type, in which the drive or the hub (7) with the surface piercing propeller (6) is mounted close to the end of a fin like hull body (4), or a fin like part of an integral hull body, preferably having an elongated torpedo like (11) bottom body, and which fin like body (4) is so deep that the propeller (6), at all speeds of the ship, operates entirely under water, and in which the rear end of the conical fin body (4, 11) extends transversally to the longitudinal direction of the ship and has an average width in this direction which is substantially less than the diameter of the propeller (6). The torpedo like body (11) may have a front cone which can be expelled some distance in front of the torpedo body (11).

Abstract: An improved planing watercraft hull having reduced surface area in contact with the water resulting in a minimization of drag said hull capable of being adapted for use with a small, easily transportable waterjet propelled watercraft.

Abstract: An improved shallow water fishing boat hull includes a generally S-shaped chine segment having a sloped intermediate portion that is intersected by the mean waterline. One or more generally Shaped strake elements may be formed along the hull adjacent to the chine segment. Due to the chine configuration, the bottom of the hull intersects the plane of the water at an increased angle so that unwanted and fish distracting hull noise is reduced. The chine segment and the strakes also form spray deflectors.

Abstract: A planing boat's primary hull has an adjunct hull surface rotatably connected thereto near its forward end. The adjunct hull surface extends along the hull of the planing boat to aft of amidships and is constructed of a rigid material that conforms to the shape of the hull of the planing boat. A position controller is coupled to the adjunct hull surface to selectively position the adjunct hull surface relative to the hull of the planing boat. When the adjunct hull surface is spaced apart from the hull of the planing boat, the position controller also absorbs shock loads experienced by the adjunct hull surface.

Abstract: A hull for a boat comprises a centrally located V-shaped keel a first strake disposed at an outboard edge of a first deadrise adjacent the keel portion, a second strake disposed at an outboard edge of a second deadrise adjacent a first chine rising from the first strake and a third strake disposed at an outboard edge of a third deadrise wherein the third dead rise is joined to the second chine. At least one of the first, second or third chines is a flat chine, at least one of the first, second or third chines is a reverse chine and at least one of the first, second or third chines is a combination chine wherein the combination chine further comprising a pad superimposed upon a reverse chine.

Abstract: A hull design with a maximally narrowed lower hull comprised of a stepped inboard chine and a concave centerline section resulting in the center of buoyancy and center of gravity preferably being in the same longitudinal position. The narrow lower hull optimally reduces the wetted surface area required, thereby reducing power requirements, fuel costs, and increasing speed potential. Exemplary dimensions for a forty-five (45′) foot hull are disclosed. The hull has a much deeper transverse step (note FIG. 3) to more effectively exploit the potential advantages of internal chines and lifting strakes, which deeper transverse step effectively achieves a bi-modal hull form—displacement and planing. The hull form consistently achieves and maintains the flow separation needed to assure the low surface area needed for minimum planing resistance and minimum sea wave impact acceleration.

Abstract: A performance vee hull that can be made with conventional aluminum manufacturing techniques on a relatively economical basis. The hull uses the lift of a concave bow, the off-setting “hold down” of strakes without lift characteristics, the tracking and drag of a keel and an integrally formed off-set motor mount with a full transom to produce a “severe vee” hull configuration (10-15 degrees inclination per side, 20-30 degrees total vee shape). The hull has a curved, reverse or concave flared bow. A bottom surface of the hull terminates at a rear edge. Behind the rear edge is a set-back section. A transom extends across the rear of the boat, and is relatively flat all the way across. The set-back section extends rearwardly 4-8 inches from the transom and has a bottom surface that is above the bottom edge of the transom, about 3-6 inches.

Abstract: A boat wake enhancer is described comprising a water tank mounted at the rear of an inboard motor boat, wherein the tank can be filled and emptied while the boat is in use. When filled, a more desirable wake is provided for water skiing and when emptied, the boat will plane more easily and generate a smaller wake.

Abstract: The present invention provides a design for a water going vessel hull and a method for determining useful hull design, and particularly multihull design, with emphasis on applicability to smaller trimaran vessels operating as displacement hulls but at speeds comparable to planing hulls. The present invention further relates to a trimaran design that includes a slender displacement type main hull with two outrigger hulls. More particularly, the invention relates to a boat hull that utilizes planing hulls or slender ellipsoidal displacement hulls as outrigger hulls, and an ellipsoidal hull (preferably, one which is longitudinally non-symmetric with and without a transom stern) as a main hull.

Abstract: A kayak comprising a hull and a deck with one or more louvers provided in said hull at least in a stern section thereof to force water to separate from said hull whereby forming voids which are replaced with air from the water surface or water from the sides as said kayak is displaced thereon. This reduces drag and the kayak benefits from a speed improvement.

Abstract: A boat comprises a central hull member (10), such member having no flat surfaces below the waterline such as could support the boat in a planing mode, the ratio of the length of such member to its beam being no less than 5 to 1, and a respective auxiliary member (12, 14) connected to each side of the central hull member and extending therealong, the auxiliary members extending to a lesser depth than the central hull member, the ratio of the beam of the boat to the beam of the central hull member being no more than two.

Abstract: A detachable hydro-planing foil for a marine outboard propeller drive comprises a plate having leading edges that are substantially backswept symmetrically from a plate centerline and trailing edges that are arced in a forward concavity substantially symmetrically from the centerline. Laterally of the centerline, the plate terminates with plate tips that are down turned with a negative dihedral of between about 25.degree. and about 45.degree.. The forward concavity of the trailing edges sweeps the trailing edge forward of the forward propeller rotational plane.

Abstract: A spray deflector for a personal watercraft, jet ski or boat including at least one pair of guards adapted for securement to opposing sides of a bow of a boat. Each of the guards have a pair of countersunk holes extending therethrough. An interior surface of each of the guards is positioned against a surface of the bow of the boat with a pair of screws extending through the countersunk holes for securement of the guards to the bow of the boat.

Abstract: The aquatic vehicle includes centers of mass (COM), of propulsion (COP) and of resistance (COR); a propulsion force (P) provided by propulsion sources (43, 44 or 143, 144); a neutralization of the propulsion and resistance torques; double blade control surfaces (20, 22, 24, 26 or 120, 122, 124, 126), each having two blades mounted on the opposite sides of a rotational axis; the surfaces being arranged such that the control effects are transmitted through COM; lateral boards (28, 30, 32, 34 or 128, 130, 132, 134) to provide the vehicle a lift in motion and structures of displacement volume (70, 72) to support the vehicle at rest. In one embodiment, the vehicle includes top and bottom components (12, 14) of equal normal cross-sectional areas (w1, w2). In another embodiment, the vehicle includes top and bottom components (112, 114) and top and bottom extensors (116, 118).

Abstract: The inventive combination of a stern wedge and a stern flap demonstrates hydrodynamic properties which, for purposes of enhancing the powering performance of a ship, are superior to those of either a solitary stern wedge or a solitary stern flap. For many inventive embodiments, the stern wedge portion's lower surface and the stern flap portion's lower surface are slanted at approximately equal angles with respect to the buttock centerline, thereby optimally consolidating the stern portion's lower surface and the flap portion's lower surface so as to effectively create an overall hydrodynamic lower surface which is slanted approximately at one and the same angle.

Abstract: A surface effect craft of simple construction achieving improved operational stability and performance at various speeds. The craft includes first and second main wing sections merge into the central hull to form a continuous aerodynamic wing structure. The wing structures are very thick with maximum thickness ratio of wing thickness to chord length on the order of 25-30% with the first and second wing sections being swept back, merging into first and second vertical side wall directional stabilizers, the wing shaped structure forming a generally U-shaped rear section (as best viewed from a rear plan or sectional view). The craft preferably includes an aft elevated secondary wing structure extending between the first and second vertical side wall directional stabilizers whereby both the main wing sections and the aft elevated secondary wing structure provide lift.

Abstract: An improved design for the lower part of the hull of a planing amphibian. The design contains an immovable member, a dampening movable member in the form of a set of overlapping plates attached to the immovable member by the length of the front edge, and air balloons placed in between the movable and immovable members. There is also a flexible coupler attached to the longitudinal edges of the immovable and movable members permitting elastic bending of the plates. The plates forming the movable member are made of a nonwettable, elastic material, allowing elastic deformation of the movable member when the amphibian encounters land obstacles. The air balloons help to dampen the deformations. When operating on rough water, the plates forming the movable member elastically deform and compress the air balloons, decreasing the loads on the lower part of the hull. When the amphibian returns to land, the plates elastically deform and impact one another, shaking off any adhering ice.

Abstract: Transitional time through the transplaning speed realm of a high speed sport/utility boat is reduced by narrow, concave planing tabs secured along the inside bottom surface of after-sponsons in alignment with the hull lifting strakes. Such planing tabs originate from the lower transom plane with an abrupt, 1 to 3 inch, step above the intersection edge of the hull bottom surface with the lower transom plane. From the lower transom plane, the planing tab length is terminated at or shortly past the boat propeller plane.

Abstract: An improved V-bottom hull for sport/utility boats is formed with intermediate lifting strakes along the aft half of the hull bottom. Such intermediate strakes are positioned laterally along the boat bottom between the planing pad step and the chine. These intermediate strakes are proportioned to provide a strake riser face width that is about 1 in. or greater and a horizontal tread width of the strake of less than about 3 in. An included angle between the tread surface and the riser face is preferably between about 95.degree. to about 110.degree.. The riser face intersection with the adjacently higher bottom surface panel is faired with a longitudinal fillet.

Abstract: The invention includes new hull systems and watercraft. In particular, the invention provides a watercraft hull that has a pivot axis forward of the hull waterline fore-aft center line. That pivot axis will be the deep water point of the hull and provides a fulcrum point around which the hull turns during a direction change. The forward pivot axis surprisingly imparts high maneuverability (i.e. the ability to execute turns of reduced radius) relative to prior systems, even at low speeds.

Abstract: The ferry boat has a rectangular main deck with superstructure above and hull structure below. The superstructure is essentially rectangular in all views and has one or more decks with a plurality of traffic lanes on each deck in addition to those on the main decks with optional passenger carrying compartments. The lanes are straight and parallel and there are no deck-to deck ramps. The hull structure has two sidewalls, one along each of the long sides of the main deck and two skirts, one at each end of the main deck. The skirts extend between the sidewalls and have vertical aft surfaces and front surfaces which slope downward and aft. The lower extremities of the sidewalls are further from the main deck than the apexes of the skirts. The volume enclosed by the sidewalls, skirts, main deck and water surface is filled with entrapped air which will compress to provide a major part of the support of the boat. There are two hydrofoils, one forward, one aft and extending between the sidewalls.

Abstract: A boat with a unique hull that stabilizes watercraft during turning conditions in water, thereby substantially reducing or eliminating the side-to-side oscillation that is typical of prior art craft undergoing this maneuver. To achieve this enhanced stability, the hull has a series of ridges or troughs, or both, to disrupt laminar flow along the hull, when the craft turns. This disruption of laminar flow stabilizes the hull and substantially eliminates side-to-side oscillation.

Abstract: A marine or naval craft having a triple catamaran-type hull (3, 3, 4) from the bottom of which project three respective ventral fins (6, 6, 7) provided with propulsion and control means (14, 17, 18) and which support a load platform (5) having a wing-like longitudinal section suitable for producing aerodynamic lift at speed.

Abstract: A light-weight, portable container is provided for the stern of a boat in order to add weight to the stern and enhance the wake of the boat. The container is formed from an outer bag resistant to abrasion and puncture and an inner, liquid impermeable bladder positioned within the bag and protected from puncture and abrasion by the bag. The bladder is filled with water through one or more nozzles accessed through openings in the bag.

Abstract: A new Hydro-Lift Boat Hull for offering greater stability and higher speeds. The inventive device includes a keel portion having a keel channel provided therein, a pair of opposed chines positioned on opposite sides of the keel portion, a pair of angled panels symmetrically positioned about the keel portion intermediate the keel channel and the pair of opposed chines, and a pair of opposed gunwales extending upward from the pair of opposed chines, wherein each of the pair angled panels has a chine channel provided therein adjacent each of the pair opposed chines. The lower edge of each of the pair of angled panels extends into the water surface, whereby the pair of angled panels and the keel channel define a water capturing keel tunnel. The base portion of each of the pair of opposed chines extends into the water surface, whereby the pair of opposed chines and the chine channels define a pair of opposed water capturing chine tunnels.

Abstract: In a Vee bottom planing boat running chines dry at top speed, running trim angle is increased by reducing wetted planing surface area by removing wetted planing surface at areas of least dynamic pressure and by shifting a portion of the trailing edge of the wetted planing surface forwardly, in combination, until running trim angle is slightly less than porpoising trim angle and such that the boat can be made to porpoise by trimming the drive when the boat is running at 70% to 100% of top speed.

Abstract: The ferry boat has a rectangular main deck with superstructure above and hull structure below. The superstructure is essentially rectangular in all views and has one or more decks with a plurality of traffic lanes on each deck in addition to those on the main deck. The lanes are straight and parallel and there are no deck-to-deck ramps. The hull structure has two sidewalls, one along each of the long sides of the main deck and two dams, one at each end of the main deck. The dams extend between the sidewalls and have vertical aft surfaces and front surfaces which slope downward and aft. The lower extremities of the sidewalls are further from the main deck than the apexes of the dams. The volume enclosed by the sidewalls, dams, main deck and water surface is filled with entrapped air which will compress to provide a major part of the support of the boat. There are two hydrofoils, one forward, one aft and extending between the sidewalls. Each foil is supported from the deck structure by several struts.

Abstract: Hull for a high speed boat, comprising a V-shaped hull bottom and channels extending in the longitudinal direction of the hull, arranged below the waterline of the hull and adapted for ballasting with water, comprising two channels (1, 2) being arranged near the hull bottom, as structural parts of the hull below the waterline of the hull, symmetrically to the centre axis of the boat, the front portions of the channels (1, 2) being connected with air apertures (4) arranged above the waterline, the channels (1, 2) comprising substantially open outlets (3) below the waterline in the stern of the boat, such that the channels are completely or partly filled with water when the boat is stationary or moved slowly, however, filled with air when the hull planes.

Abstract: A small watercraft hull is shaped to prevent spray from being splashed on occupants of a watercraft, to enhance the course stability of the craft during turning, and to reduce the resistance of the craft body 3 to the water. A longitudinal chine, extending in a longitudinal direction, and rearwardly curved transverse chines extending in transverse directions and located in the fore part of the craft body, are provided on a V-shaped hull bottom of the craft body, the transverse chines being so formed as to cross the forward part of the longitudinal chine or an imaginary line extended forwardly from the longitudinal chine.

Abstract: A boat hull having a bow lifting surface, a stepped bottom aft of the bow to create an air space between the water and the bottom of the hull and a stern lifting surface extending downwardly from the stepped bottom such that the bow lifting surface and the stern lifting surface angle of attack is fixed at the angle for maximum lift to drag for a given deadrise angle. The effect is to lift the hull vertically the maximum possible, so the wetted hull area and drag are reduced to the minimum. As the deadrise angle changes from 0 degrees to 25 degrees, the angle of attack for best lift to drag changes from approximately 7 degrees to 14 degrees. For a V-shaped hull the angle of attack is in a range of nine through fourteen degrees. A flat bottom hull should have an angle of attack in a range of six through eight degrees, preferably seven degrees.

Abstract: A thixotropic slurry is used as a drag reducing agent for water borne vess. The slurry comprises a polymer, a carrier, a surfactant and a dispersant. The slurry is buffered against changes in pH which can be the cause of separation of the constituents during storage in the vessel. The slurry also has a more rapid initial drag reduction response time since the polymer is coated with a monomolecular layer of surfactant.

Abstract: A hybrid high performance water vessel consists of two hulls: an upper hull with a pair of main fluid-lifting-plane means (called mainfoils thereafter), for providing hydrodynamic lifting force at high speed; and a torpedo shaped streamlined sub-hull disposed beneath the water line, for providing the majority of flotation. Along the water line is a knife-like slender hull called mainstrut that pierces through water surface to minimize the crucial wave-making resistance. The mainfoils are located close to one end section of the vessel, and the sub-hull is placed at the other end section of the vessel, so that the center of hydrodynamic lifting force of the mainfoils and the center of buoyancy of the water vessel is offset substantially along the longitudinal axis of the vessel system. It enables the water vessel of present invention to have a "Hull Inclination" capability that improves the performances of said water vessels.

Abstract: The invention relates to a boat hull, in particular for high speed crafts, the underside of which has in at least one longitudinal section through or, respectively, parallel to the center plane a profile similar to the profile of an aircraft wing, the vertex of the longitudinal sectional profile, with respect to the bow-side end point of the chord of the longitudinal sectional profile, being positioned in the front half of the entire length of the chord. According to the invention there is provided that the chord (1) of the unloaded boat hull (2) includes an angle () with the horizontal plane defined by the water level (3) of 1.degree. to 3.degree., preferably of 1.5.degree. to 2.5.degree., in particular of 1.8.degree. to 2.2.degree., so that the stern-side end point (4) of the profile is positioned at the lower end point of the stern or, respectively, of the transom (5) below the water level (3).

Abstract: A boat hull constructed with an inverted U-shaped hull bottom, hull sides which are vertical below the at-rest water line and outwardly curved in a deep arc above the at-rest water line, and a rudderless, arcuate concave tunnel from bow to stern is disclosed. Preferably, the port and starboard gunwales are parallel and the port and starboard chines are parallel. The inventive boat hull is capable of smoothly and rapidly assuming a hydroplaning position without use of submerged hydrofoils, and without pounding upon waves. The hull is navigable in fouled water, substantially reduces water sprayed aboard, and eliminates "tripping" when navigated through sharp turns.

Abstract: A submersible boat is provided which utilizes a planing boat hull with a sharp bow and blunt stern. The submersible boat performs as a planing boat until it nears the target location. Then, the boat submerges in order to avoid detection. After this vessel submerges, it travels with the blunt end forward and the sharp end aft.

Abstract: A planing hull having a conical contour extending from the bow portion to a stern portion having a flat surface on each side of the keel, a wide lip chine having a lip portion, and a transom separating the bow portion and the stern portion creating a step between the bow portion and the stern portion. A flat keel portion extends from the stern to the mid hull transom.