Abstract: A boat hull having an upper hull section, a pair of spaced apart substantially parallel elongated outer sponsons extending from a forward portion to a stern portion of a bottom of the upper hull section, the outer sponsons and upper hull section defining a tunnel therebetween; and an elongated center sponson extending along the bottom of the upper hull and positioned in the tunnel between and substantially parallel to the pair of outer sponsons and having a forward section with an upwardly extending trailing step wall defining an upward step in the center sponson, and an aft section that is located aft of the forward section, the aft section having an upwardly curved leading edge intersecting the step wall of the forward section. The upper hull section can have planar bottom.

Abstract: A hull of a boat, which is particularly intended for use with a jet pump propulsion system, is provided with two channels formed in the port and starboard surfaces of the hull and displaced from a keel line. Each channel comprises a forward edge that intersects the hull at an angle to define a continuous surface with a portion of the hull that is immediately forward of the channel. The channel intersects the transom of the boat at a rearward edge. Each channel has a pair of sidewalls which are contiguous with their associated generally planar surface of the channel. The sidewalls are generally parallel to a central vertical plane which extends from a bow of the boat to a transom of the boat and in which the keel line is disposed. Each pair of sidewalls are generally parallel to each other.

Abstract: An unventilated, stepped hydroplaning boat hull has at least one midship step. Two separated wetted planing surfaces are thereby established—a forward surface just forward of the step and an aft surface just forward of an aft edge of the hull. The angles of attack of each planing surface preferably lie in the range 2.0-6.5 degrees, and are preferably equal. The midship step is preferably located longitudinally in a range of 0.45 to 0.51 times the projected chine length of the hull, measured aftward from a forwardmost point of the chine.

Abstract: A device for reducing the resistance to the advancement on water of a motorboat (1), including a keel (2), on the underside of which at least one step (3) is provided; projecting element (6) for increasing the points of separation of the motorboat (1) from the water are provided at the step (3) and extend away from its free edge, on the projecting element (6) there acting the weight of the boat which is hence distributed over a greater number of points than those of the step (3), the projecting element provided regularity in the streams of air and water which flow below the keel (2) downstream of the projecting element, and creating a microvotex effect between the projecting element and the keel which contributes to the support of the boat, such that there is a smaller resistance to the advancement of the motorboat on water, with consequent higher boat speed.

Abstract: Presented is an air lubricated ship that offers improved efficiency and stability over the prior art. Features of the preferred embodiment of the invention include: 1) a submerged bow that is generally proximal in depth to the stem, 2) a hydrofoil at the bow that not only adds stability but also allows the pressurized air layer(s) to extend further forward under the hull thereby reducing wetted area friction, 3) use of more than one air layer in series which is generally accomplished by water deflecting steps at the air layers forward portions, 4) special positioning of propulsors so that they do not interfere with the air layer(s) by aspirating pressurized air from the air layer(s), 5) optional outrigger hulls to aid to stability and to also increase useful deck area, and 6) optional configurations that allow for use of more than one air lubricated hull where such hulls are connected by structure in catamaran or other arrangements.

Abstract: A hull configuration for a vessel that utilizes multiple effects to reduce friction between the vessel and the water's surface is provided by the present invention. In various embodiments, a surface effect is employed such that a supporting cushion of air is provided underneath the hull to substantially isolate portions of the hull from coming into contact with the water's surface. A blower is used to provide pressurized air to the air cushions. The inlet of the blower is positioned in the direction of the vessel's movement such that a ram air effect decreases the power required by the blower. An amount of thrust is also generated by the forward placement of the blower inlet. The vessel has a superstructure that is shaped to create a low pressure zone above the vessel. This low pressure zone creates a lifting body effect such that the friction between the hull and the water's surface is reduced.

Abstract: A marine vessel air induction system introduces air into an under-hull cavity bounded by an underside, first and second sides, and fore and aft planing surfaces. An air inlet receives ambient air. A plenum receives air from the inlet. A fore planing surface has a trailing edge. The trailing edge and the plenum define a step that communicates with the plenum to generate a first pressure that is less than ambient pressure as a free stream of water moves past the step. Air communicated from the plenum is entrainable in the water. A mixing chamber communicates with the step, and the step and the mixing chamber cooperate to permit kinetic energy of the water to increase pressure of entrained air. At an aft end of the mixing chamber, the entrained air exerts a second pressure that is greater than ambient. Air is exhausted upwardly into the cavity.

Abstract: A boat hull represented in a high speed attitude relative to a water surface-has a generally monohull section. A forward keel portion is flattened to form a plank-like planing surface having a replaceable shoe including stability extensions. Main bodies of sponsons are configured with air dams or spray walls. The sponsons define outer walls of side tunnels. The hull form, inboard of the side tunnels, provides side planing surfaces that step down transversely to the keel planing surface. Front and rear portions of the sponsons are connected by the air dam or spray walls and bound side tunnels having side planks or planing surfaces disposed at their inner edge. A step in the keel is provided to define a tunnel disposed between two downwardly depending side walls. Across afterplanes an integrated undersurface has an outboard motor insertion space with a continuation of the recess upper surface and provides a lateral boundary of a space.

Abstract: A watercraft incorporates a vertically elongated displacement hull section to elevate the riders of the watercraft well above the water level when the watercraft is up on plane. During normal low-speed displacement hull-type operation, the elongated displacement hull section remains submerged, and does not appreciably affect the stability of the watercraft. When the watercraft is accelerated to planing speed, however, the elongated displacement hull section rises out of the water, and the watercraft planes on the planing surface disposed at the bottom of the elongated displacement hull section. In this manner, the operator/riders are lifted a significant distance above the surface of the water. The watercraft further incorporates an elongated displacement hull section having a bulged section which is sized to accommodate the watercraft engine within the elongated displacement hull section.

Abstract: A device for reducing the resistance to the advancement on water of a motorboat (1), this latter comprising a keel (2), on the underside of which at least one step (3) is provided; projecting means (6) for increasing the points of separation of the motorboat (1) from the water are provided at the step (3) and extend away from its free edge, on said means (6) there acting the weight of the boat which is hence distributed over a greater number of points than those of the step (3), the projecting means providing regularity in the streams of air and water which flow below the keel (2) downstream of said means, and creating a microvotex effect between said means and the keel which contributes to the support of the boat, such that there is a smaller resistance to the advancement of the motorboat on water, with consequent higher boat speed.

Abstract: A method of controlling the attitude of a boat at high speed through boat hull design involves a first step of forming a pair of high speed steps in the hull of the boat. The pair of high speed steps provide enough surface area to control ride attitude, while reducing the wetted area of the hull to decrease drag. A second step involves forming transition steps to provide a transition to the high speed steps as the boat accelerates. In addition to reducing drag, the method aids in turning and lifting of the hull by trapping air and water in the steps.

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 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 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 channeled air planing apparatus improves low speed performance of boats without adversely affecting high speed performance. The apparatus includes structural elements for channeling air to a transverse step adjacent a running surface. Air channeled to the transverse step eliminates low pressure at the step caused by flow of water past the step, which in turn enhances low speed performance by lowering the bow of the boat and reducing drag on wetted propulsion equipment and other aft boat structure. In a preferred embodiment, the channeled air planing foil includes a lower hydrofoil member attached to a setback area of the boat by a pair of substantially parallel sidewalls aft and above the boat's running surface. When the boat is at rest, a channel defined by the lower hydrofoil element and sidewalls contains water. As the boat moves forwardly through the water during takeoff, water is evacuated from the channel and replaced with air which ventilates the transverse step.

Abstract: A boat hull system for reducing the friction between boats and water. The boat hull system includes a boat with a front and a rear. Towards the front there is a hull with a forward portion that includes a width tapering smaller toward the front and towards the rear there is a rearward portion that includes a substantially uniform width between the forward portion and the rear. The hull includes a lower surface with a keel ridge. The forward portion is substantially smooth between the keel ridge and a lateral side of the lower surface. The lower surface of the rearward portion includes a plurality of strake ridges extending substantially parallel to the keel ridge, and includes at least two strake ridges on each lateral side of the keel ridge. The adjacent strake ridges define a channel therebetween. An air duct extends from the lower surface of the forward portion and the lower surface of the rearward portion for moving air between the forward and rearward portions.

Abstract: An improved method for raising a propeller up into the hull of a marine water craft for the purpose of reducing the likelihood of underwater impact and improving shallow water operation without encountering the high efficiency losses normally associated with shallow draft drive systems or water jets. It utilizes a unique tunnel which is open bottomed and extends longitudinally in the running surface of the hull. The lead in to the tunnel, which is termed the “chute” forms the entry to a deeper portion of the tunnel located further aft. A super-cavitating propeller is positioned in the aft tunnel section. The propeller is raised vertically into the tunnel such that the propeller blade tips can be above, below or flush with the running surface of the hull but the prop shaft is always above the running surface of the hull. The invention relates to the longitudinal position of the chute with respect to the propeller, the general shape of the chute and its normal method of operation.

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 boat hull of exceptional performance and stability combines a deep V entry configuration transitioning to a catamaran-like after section to produce the soft water entry that is characteristic of a deep V design together with the lateral stability that is characteristic of a catamaran.

Abstract: A personal watercraft includes an improved hull design which reduces drag on the watercraft and inhibits porpoising of the watercraft at high speeds, while providing adequate buoyancy when the watercraft is at rest. The watercraft hull includes a pair of steppers positioned toward the aft end of the watercraft hull. The rear stepper has a greater height than the front stepper. This design reduces the wetted area of the hull when the watercraft is up on plane. The second stepper, however, provides additional surface contact should the watercraft to porpoise in order to stabilize the watercraft. The hull design also includes improved foot steps and adjustable sponsons. The foot steps are sloped upwardly in order to provide greater control of the watercraft when leaning the watercraft in a turn.

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: 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: 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: 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 small jet propelled watercraft having a hull undersurface provided with a plurality of stripes and a step at the rear end thereof to reduce porpoising without increasing drag. The watercraft is propelled by a jet propulsion unit having a discharge nozzle which is capable of trim adjustment and which is controlled by a twist grip control mounted on its steering handlebar.

Abstract: A power boat hull has an inner running surface with a central running surface and an outer running surface that flanks the inner running surface. The outer running surface forms a channel with concave curvature which extends from the bow to the stern. An improved channel is shaped so that pressure builds in the channel during turning of the boat to lock the hull to water throughout the turn. A transom is provided with a deflector plate having a curved surface that is lifted out of the water during high speed running of the boat and operatively deflects water downward to force the bow of the boat into the water during low speed running of the boat. The transom dimensions are altered to accommodate varying length boats.

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.

Abstract: A high speed planing hull is provided, which is generally of a deep Vee form and which is provided with multiple steps in the fore-and-aft direction in combination with variable dead rise from keel to chine in the steps. The arrangement is such that, when the hull achieves planing speeds, not only is the hull bottom ventilated at the fore-and-aft steps, but the variable dead rise configurations, which provide for elevation of the keel area in relation to the chine area, provide for increased support of the hull near the chines, and relatively less support near the keel. Reduced wetted surface, and therefore frictional drag, is realized, while at the same time providing for a safer and more comfortable ride by improving both longitudinal and lateral stability.

Abstract: There is provided a boat hull 10 having a keel portion 11, a transom 12 and a deadrise portion 13. The deadrise portion 13 of the hull 10 has a recess 15 in the region of the transom 12 having a substantially planar upper surface 17 and bounded by side walls 20 and leading edges 21. The length of the recess is selected to be about 20% of the overall length of the boat hull 10. The depth of the recess 15 is selected to be about 10% of the length, and is configured such that the upper surface 17 is disposed at an angle substantially parallel to the water trailing from the leading edges 21 when the boat is on the plane. A step 22 is provided such that the upper surface 17 may break contact with the water as the hull accelerates, and the angle .beta. of the leading edges 21 is selected such that the leading edges 21 are substantially parallel to the water surface. A vent 23 is provided connecting the recess 15 to the atmosphere as a vacuum breaker.

Abstract: A pontoon-type boat comprising a deck having opposite sides, and a modified tunnel hull supporting the deck and including a first outer sponson located adjacent one of the sides of the deck, a second outer sponson located adjacent the other of the sides of the deck, and a center sponson which is located and spaced between the outer sponsons, which extends substantially the entire length of the boat, and which includes a rearward portion having a maximum depth and a maximum width, and a forward portion having a maximum width greater than the maximum width of the rearward portion and having a maximum depth greater than the maximum depth of the rearward portion, the forward and rearward portions defining therebetween a step.

Abstract: A catamaran for pastime, model construction or racing with induced hydrodynamic stability, having a hull with a board (1) and a pair of longitudinally extended semi-immersible appendages (2, 3; 8, 9; 13, 14; 24, 25) arranged parallel to each other symmetrically to the center-line of the hull, the respective bottoms of which, at the bow tips (4, 5; 12, 12a; 21, 22; 32, 33) of said appendages, have mutually opposite slopes, each slope being contrary to the slope of the respective aft rest of the bottom with respect to the median symmetry plane of the hull.

Abstract: A power boat hull has an inner running surface with a central running surface and an outer running surface that flanks the inner running surface. The outer running surface forms a channel with concave curvature which extends from the bow to the stern. An improved channel is shaped so that pressure builds in the channel during turning of the boat to lock the hull to water throughout the turn. A transom is provided with a deflector plate having a curved surface that is lifted out of the water during high speed running of the boat and operatively deflects water downward to force the bow of the boat into the water during low speed running of the boat. The transom dimensions are altered to accommodate varying length boats.

Abstract: A hydrofoil craft according to the invention is provided on the bottom of the hull with at least one, usually several, air cushion recesses arranged along the middle of the bottom in a fore-and-aft direction. The air cushion recesses each forms a groove having the upwardly indented bottom, the upper wall front end, to be deeper and becoming shallower toward the rear end and resembling a triangle or sector in shape when viewed in a longitudinal section and generally to be a rectangle in shape when viewed in a plane. The angle from the shallowest end of the air cushion recess to the deepest end is within 1.degree. to 30.degree. and the two side walls on the sides of the bulwarks of the recess extend a little to the lower parts of the fore-and-aft end walls. The hydrofoils are mounted across the lower parts of the air cushion recesses and are close to the air cushion recesses.

Abstract: A power boat hull that has central running surface and na outer running surface that flanks the central running surface. The outer surface forms a channel with concave curvature which extends from the bow to the stern. The channel is shaped so that pressure builds in the channel during turning of the boat to lock the hull to water throughout the turn. A transom may be provided with a deflector plate having a curved surface that is lifted out of the water during high speed running of the boat and operatively deflects water downward to force the bow of the boat into the water during low speed running of the boat.

Abstract: A catamaran design has a third hull positioned between the conventional hulls. The third hull has a length equal to about two-thirds of the length of the conventional hulls, and a recess is formed in the underside of the deck aft of the third hull. The recess has a depth sufficient to accommodate the rooster tail created by the third hull. The third hull enhances the buoyancy of the craft and prevents formation of waves under the leading end of the deck. The recess prevents the rooster tail from impinging against the underside of the deck. The third hull produces a concave wake and it is submerged to a similar extent as the twin hulls when the watercraft is at rest floating in a body of water. In combination, the third hull and recess provide a catamaran that can handle heavy seas, with control and safety, that is not subject to the pounding of waves on the underside of its deck, and which performs in all other respects like a conventional catamaran.

Abstract: A fast watercraft has a central body (11), the V-shaped bottom frames (15) of which become flatter from the foreship towards the stern. In the stern region two mutually symmetrical lateral annexes (12) having chine-like frames are arranged on the central body (11) with the base frames (13a to 13e) of the lateral annexes having the same or a smaller inclination to the horizontal than the bottom frames (15e to 15i) in the same vertical frame plane.

Abstract: A hydroplane hull according to the present invention comprises a forebottom surface and an afterbottom surface connected by a step. The afterbottom surface has an aft portion formed with a positive trim angle and a forward portion with a non-negative trim angle which is of lesser angle than that of the aft portion.

Abstract: The boat has a flap (1) forming a part of its V- or spoon-shaped bow and being unfoldable therefrom. This flap is supported by means of projections (9a,9b) arranged on both of its sides on swivel joints (13a,13b) set back into the inside of the boat with respect to the inner wall of the bow. Upon pivoting the flap (1) out of the bow opening (15), the flap is swung away from the bow wall portion with the uncovering of an interspace (2) between the flap and the bow wall portion which latter lies underneath the bow opening (15). The flap outside wall can be urged underneath the surface of the water and can be fixed in its position. The flap (1) is designed as a buoyant member, and when serving as a working or recreational platform, etc., can be folded back into the bow of the boat in such a way that the hydro- and aerodynamic properties as well as the esthetic appearance of the bow are not impaired.

Abstract: A planing hull of a water craft including side keels and a center keep. A downwardly open chamber is defined rearwardly of the center keel and is flanked on either side by the side keels. The chamber confines a cushion of air which supports the hull in the planing mode, air supply to the chamber being wholly via the underside of the hull by being channelled between the keels without the use of air vents which open into the chamber. The absence of air vents provides improved drag at medium and low speeds.

Abstract: An improved boat construction is disclosed in which a boat, having the typical elongated hull, bow and stern, has a bottom configured as a hydroplane including a transverse step spaced from the bow and stern. A well is provided in the boat bottom and extends from at least the transverse step through the boat stern and receives a powered impeller for engaging and pushing water backwards in a confined flow path within and beyond the well so as to thrust the boat forward. Vertical deflectors are positioned rearwardly of the powered impeller and are attached to the boat in the vicinity of the boat stern for engaging the backwardly moving water in the confined flow path so as to increase or decrease the size of the confined flow path of backwardly moving water emanating from the powered impeller. Immediately forward of the powered impeller in the well is a horizontal deflector which directs more or less water to the powered impeller.

Abstract: A boat hull is provided with a unique V-shaped bottom surface to increase lift, to reduce drag, and to maximize speed. The deadrise angle of the V-shaped bottom increases progressively from the stern to a point forward of the stern at a rate of 2.degree. to 6.degree. for each four feet of keel length, i.e., at the rate of about 1/2.degree. to 11/2.degree. per foot of keel length. The bottom surface between the stern and the forward point has a generally convex transverse cross section. The keel is substantially straight from the stern to the forward point and then curves upwardly to the bow.

Abstract: Methods and apparatuses for both reducing and increasing water-side drag of marine vessels are disclosed, to enhance vessel operation and control. The hull of a marine vessel employing the invention would be sectionally constructed, to form a rigid structure. A short central bow section terminating in a primary lateral hydrodynamic step and a longer adjacent aft central hull section are disposed between narrow outboard hull sponsons having large length-to-width aspect ratios which provide substantial buoyant support for the vessel, enclosing an open-channel conduit under the vessel's aft central hull section. Outer water-side surfaces of the elongate outboard hull sponsons are contoured similarly to common racing shells and finished smooth, to delay or prevent flow separation and pressure drag. A shallow-draft aft central hull section having a shingled multi-step bottom surface abuts the central bow section adjacent the primary lateral step.

Abstract: A motor-boat hull (10) includes a planing bottom (C) having a V-shaped forward portion, two float-like side portions (14) connected forwardly to the V-shaped portion (12), and a flat recessed aft portion (16) delimited by the side portions (14) and forwardly by a transverse step (18) connecting it with the V-shaped forward portion (12) of the bottom (C).

Abstract: A planing boat hull including a bow, a transom, a keel and an underside having:a. a transverse step adjacent the transom which extends partially the width of the underside; andb. a recess bounded by the transverse step and a pair of side walls and having an open transom end.The hull underside may further include a pair of substantially planar portions wherein each portion is located adjacent to a respective side wall of the recess. The hull underside may further include a plurality of lift strakes including an outermost lift strake terminating at or adjacent the transom, one or more intermediate lift strakes terminating short of the transom and the outermost lift strake and an innermost lift strake located adjacent to the keel terminating short of the transom end(s) of the one or more intermediate lift strakes.

Abstract: A hard shell shaped to intimately cover the bottom of an inflatable raft. The shell is made of various contoured staves or segments joined together. Straps are used to attach the shell to the raft, bow and transom. A combination transom and mounting frame is used in the raft which do not include a built-in transom. The shell not only protects the raft against abrasion and puncture, but also reduces its drag coefficient, contributes to it stability and enhances its directional control.

Abstract: A design for the bottom of a boat is provided which has particular applicability for the case of single-screw planing boats. The invention comprises stepped regions in each after outboard corner of the hull bottom which are sized and configured so as to give a substantial reduction in wetted bottom area, while at the same time avoiding encroaching on those two regions of the hull bottom which it is desirable to have remain in contact with the water surface in the planing condition. The first of these bottom regions which it is important to have remain wetted is a narrow arrowhead-shaped band which begins at the forward boundary of the region of the bottom which is wetted by solid water at high speed and extends for a short distance aft. This is the region of high pressure on the bottom of the boat which supports its weight in the planing condition.

Abstract: A hull with a convexly down-stepped plane located in the aft section and a "V" shaped hull structure in the forward section. The "V" shaped section and the planar section are connected by a smooth, convexly shaped transition section that is convex in reference to the exterior of the hull and extends below the "V" section. The transition section can be provided with spray root deflectors. The planing surface extends substantially the full width of the lower portion of the hull and can have portions of its after portion upwardly displaced.

Abstract: A deep vee entry hull having a central running surface extending fore and aft thereof, the cross-section thereof transitioning from a pronounced vee to a nearly planar configuration from fore to aft of the hull, the central running surface narrowing at its aft end portion and being flanked, in the after portion of the hull, by first and second inner running surfaces, intermediate running surfaces and outboard running surfaces, the first inner running surfaces being planar and exhibiting, with the central running surface, a vee configuration in cross-section; and the intermediate and outboard running surfaces exhibiting a cross-section of uninterrupted concave curvature commencing amidship to the extreme aft exit end thereof; the hull including sidewalls and the curvature of the concave intermediate and outboard running surfaces, at any given fore and aft positions, are constant, up to and including, an outer lip of said outboard running surfaces merging the same with the hull sidewalls; the intermediate and o

Abstract: A marine hull including a plurality of channels extending rearwardly and inclined, in plan, with respect to the central longitudinal vertical plane of the hull, the cross-sectional shape of each channel being curved so that its surface intercepts water when the hull is mobile and that water is caused to leave each channel in a downward direction thereby imparting lift over a major portion of the length of the hull.

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.