Abstract: The present invention relates to a hull in particular for a container ship, a bulk carrier and a tanker. The hull includes an elevation of an outer contour of the hull with respect to an upwards directed vertical direction of the hull in the region of a first body plan and a second body plan in relation to a surface section immediately adjoining to the elevation. Therein, the elevation is arranged in a region between a middle and a stern of the hull.

Abstract: One or more propulsion arrangements for water vessels, and in particular propulsion arrangements that include flanking rudders with bidirectional high-lift sections to improve performance, particularly in the reverse direction. The flanking rudders are positioned adjacent a propulsor for directing a slipstream flow when the vessel is travelling in the reverse direction. Each flanking rudder has an elongated profile extending from a first edge to a second edge, and in which each elongated profile has a first bulb portion, a convex middle portion, and a second bulb portion.

Abstract: A cockpit extension that extends aft of a boat transom for increasing the afterdeck area of the boat. The cockpit extension includes a deck that can be accessed from the afterdeck of the boat and an under-face beneath the deck that can be above or below the water-line of the boat. The cockpit extension can also include one or more of a gunwale, inner bulkhead, and outer freeboard. A running surface can also be provided on the under-face that improves the backing down process of the boat. The boat has at least two outboard engines, attached on the port and starboard sides of the boat transom, respectively.

Abstract: A cockpit extension extends aft between port and starboard outboard engines mounted on a tri-pontoon boat transom for increasing the usable afterdeck area of the boat. The cockpit extension includes a topside deck that can be accessed from the afterdeck of the boat and an under-face beneath the topside deck that can be above or below the water-line of the boat. A lower surface of the under-face can be configured to improve the backing down characteristics of the boat.

Abstract: The invention relates to an arrangement for multi screw vessels, in particular twin screw vessels, with external propeller shafts, as well as to a method for producing such an arrangement. The arrangement according to the invention is in particular suitable for a drive system of an above-mentioned multi screw vessel and to improve the energy efficiency thereof.

Abstract: A propulsion device of the ship includes a port side screw propeller; and a starboard side screw propeller provided in a forward or backward direction in a longitudinal direction of the ship from the port side screw propeller, such that a part of propeller wings of the starboard side screw propeller overlaps with propeller wings of the port side screw propeller. One of the port side screw propeller and the starboard side screw propeller, which is on a forward side in a longitudinal direction of the ship, is the forward screw propeller, and the other is the backward screw propeller. The forward screw propeller has a wing shape by which tip vortex cavitation is more difficult to be generated by the forward screw propeller than the backward screw propeller.

Abstract: A stern structure of a ship includes a plurality of propellers, a plurality of propeller shafts and a stern structural body. A plurality of propeller shaft tubes is provided correspondingly to the plurality of propellers, and the plurality of propeller shafts connected to the plurality of propellers is inserted into the plurality of propeller shaft tubes. The stern structural body extends backwardly from the stern body, spreads externally with respect to a ship body center line C, and contains portions of the plurality of propeller shafts extending backwardly from the stern body. An inner side of the stern structural body is equivalent to an interior portion of a ship body. The stern structural body supports the plurality of propeller shaft tubes in the interior portion of the ship body.

Abstract: A stern structure of a ship includes a plurality of propellers, a plurality of propeller shafts and a stern structural body. A plurality of propeller shaft tubes is provided correspondingly to the plurality of propellers, and the plurality of propeller shafts connected to the plurality of propellers is inserted into the plurality of propeller shaft tubes. The stern structural body extends backwardly from the stern body, spreads externally with respect to a ship body center line C, and contains portions of the plurality of propeller shafts extending backwardly from the stern body. An inner side of the stern structural body is equivalent to an interior portion of a ship body. The stern structural body supports the plurality of propeller shaft tubes in the interior portion of the ship body.

Abstract: A stern shape of a displacement-type marine vessel enables reduction of the hull resistance and prevents propeller cavitation. The displacement-type marine vessel which travels in a velocity range in which the Froude number is smaller than the last hump and the stern includes knuckle lines connecting knuckle points provided on the surface of the hull, from a starting point in front of a propeller to an end point behind the propeller. A portion of the stern located inside the knuckle line in the direction of the width of the hull has a dome shape with upward curvature, and the length of the portion which has the dome shape is set to 10% or more of the entire hull length or at least the diameter of the propeller.

Abstract: In a displacement-type marine vessel which travels in a velocity range where the Froude number is smaller than the last hump, a stern shape includes knuckle lines connecting knuckle points, provided on the surface of the cross sections of the hull at the stern, continuously from a starting point in front of a propeller to an end point behind the propeller in the fore-and-aft direction of the hull, and a frame line located inside the knuckle line in the width direction of the hull which has a dome shape with upward curvature, the length of the hull portion which has the dome shape is 10% or more of the entire hull length or at least the diameter of the propeller, and the position of the starting point in the width direction of the hull is outside the position of the radius of the propeller.

Abstract: The invention relates to a watercraft, particularly a river boat, with a hull for receiving useful devices and with propulsion units for generating a driving force and which are located on the hull. The watercraft according to the invention is characterized in that guiding elements are provided in the bow area on the underside of the hull, which have a vertical, forwardly tapering wedge shape, that the propulsion units in the bow area are set back from the wedge-shaped guiding elements, that between the guiding elements is provided a partial area of the hull constructed in the form of a horizontal wedge and that the propulsion units are pivotably mounted.

Abstract: A boat hull comprises a hull body having two lateral flanks linked by a bottom surface, and at least two propulsion compartments provided in two bulges protruding below the bottom surface of the hull body. Each propulsion compartment lodges a propulsion engine located below the bottom surface of the hull body. The propulsion engines are located at the deepest position in the hull and below the water plane.

Abstract: A ship of a displacement type with a pointed bow and a transom stern, a longitudinal length of L, and defining a base plane and a design waterline plane, the ship comprising: approximately sinusoidal waterlines; a surface extending from the transom stern at the design waterline plane to the base plane at about L/2 and defining an angle between: the base plane and an oblique plane, the oblique plane being defined by: a line at the intersection of the transom stern and the design waterline plane and a point located on the surface at about 0.2 L from the transom stern, and a first propeller which is attached to the ship so that the hull wake through the first propeller is less than 0.50.

Abstract: A hull for a water vessel which includes an elongated displacement vessel having bow and stern extremities, a major longitudinal and normally horizontal axis, a vertical and normally perpendicular axis, a length of about L along the longitudinal axis, a propeller mechanism near the stern extremity and a guide vane which is located at a distance of between about 1/4 L and 1/2 L (preferably about 1/3 L) ahead of the propeller mechanism.

Abstract: A propulsion system capable of more efficiently accomplishing all that the prior art propulsion systems can accomplish and additionally providing for maneuvers that had hereto been unavailable with purely stern-driven craft through the use of a first and second method for generating propulsion mounted at the rear of the craft to be driven. The two methods for propulsion are arranged one over the other so that the centerlines are substantially aligned vertically. A movable rudder is mounted substantially vertically at the rear of the craft parallel to the centerline of and in the effluent streams of said first and second propulsion method. A fixed fin array is also mounted at the rear of the craft in the effluent streams of said first and second propulsion method just forward of the rudder.

Abstract: A motor boat with auxiliary and main motors and having a transom with a pocket or recess constructed and arranged to receive and support an auxiliary outboard motor. The auxiliary motor is connected to a steering control in a helm control center which steers both the auxiliary and main motors. Preferably operating controls enable starting, tilting and steering of both motors and associated propulsion assemblies from the helm. Preferably, the operating controls include a cable carried in a sheathing attached to a steering wheel mounted in the helm control center and adapted to turn or move the rudder of the main motor and the auxiliary motor propulsion assembly to thereby steer the boat.

Abstract: A control surface design for submerged vehicles. The control surfaces are vably mounted or radially extending support members such that the wake created by the deflection of the control surfaces will not be transmitted to the propeller. The support members have a cross section that minimizes flow disturbances in the region of the propeller.

Abstract: A hull for a water vessel which includes an elongated displacement vessel having bow and stern extremities, a major longitudinal and normally horizontal axis, a transverse and normally perpendicular axis, a length of about L along the longitudinal axis, a propeller mechanism near the stern extremity and a guide vane which is located at a distance of between about 1/4 L and 1/2 L (preferably about 1/3 L) ahead of the propeller mechanism.

Abstract: A propulsion system capable of more efficiently accomplishing all that the prior art propulsion systems can accomplish and additionally providing for manuevers that had hereto been unavailable with purely stern-driven craft through the use of a first and second apparatus for generating propulsion mounted at the rear of the craft to be driven. The two apparatusses for propulsion are arranged one over the other so that the centerlines are substantially aligned vertically. A movable rudder is mounted substantially vertically at the rear of the craft parallel to the centerline of and in the effluent streams of the first and second propulsion apparatus. A fixed fin array is also mountede at the rear of the craft in the effluent streams of said first and second propulsion apparatus just forward of the rudder.

Abstract: Ship's hull, characterized by the fact that the hull below the construction water line (C.W.L.) consists of a bulb-shaped displacement body extending approximately over the entire length of the ship, which is slim in the forebody, then becomes uniformly thicker toward the stern over approximately 2/3 of the ship's length, and then tapers toward a large central propeller (P), and on top of which there is a vessel with lines in the nature of the V-shaped frame, which makes a transition toward the stern into a tunnel, which covers the bulb-shaped body and propeller so that above the bulb, there is a sharply concave, trough-shaped form.

Abstract: A high speed vessel system comprises a surface-craft, a sub-craft, a pair of main foils, at least a pair of auxiliary foils, a narrow strut connecting the sub-craft with the surface-craft. The main propeller and main rudder are located at the stern end of the sub-craft hull. When the vessel system is cruising at a high speed, the surface-craft will be lifted above the water line mainly by the buoyant force of sub-craft hull. The foils will control rolling and pitching of the vessel system. The surface-craft and sub-craft will be connected by a separable ball joint (first embodiment) or a plurality of rotatable links (second embodiment) when the vessel system is in sea operation. The sub-craft can be raised up to the water surface level to minimize the draught of the vessel system when the system is resting in a harbor. The present vessel system is specifically designed for a sea going vessel of big size and large tonnage, which needs to cruise at high speed constantly.

Abstract: A vessel equipped with a single screw comprising a propeller shaft positioned on the vertical hull center plane, an upper deck portion which is substantially symmetrical with respect to the vertical hull center plane, and a stern portion having a longitudinal plane passing through a stern end of the vessel. The longitudinal plane of the stern portion is positioned laterally offset from the vertical hull center plane by 5 to 25% of a diameter of a propeller disc plane. The longitudinal plane of the stern portion is positioned on the port side when the propeller shaft is rotated clockwise. The longitudinal plane of the stern portion is positioned on the starboard side when the propeller shaft is rotated counterclockwise.

Abstract: An outboard motor boat having an aft configuration with a new and improved transom configuration that includes a stand alone, upwardly projecting, cantilever shaped central transom portion. The transom configuration also includes a transom mid portion connected to the base of the central transom portion and a lower transom portion connected to the transom mid portion. The central transom portion is positioned centrally between a port side through transom walkway and a starboard side through transom walkway. The port side through transom walkway and the starboard side through transom walkway project aft from the aft deck along either side of the central transom portion to a position at least adjacent a portion of the side of an outboard motor position at the stern of the outboard motor boat.

Abstract: Improved jet propelled aquatic vessel (1) with a hull (60) profile which increase water entrainment to the jet pump intake orifice (14) and tends to stabilize the vessel. The vessel has a hull (60) with a lowered center section (13) wherein a concave water entrainment groove (15) is located. The vessel includes an operator control panel (43) and an operator support structure (10). The engine (20) is forwardly mounted in a closed engine compartment (21) while the air intake (29) for the engine (20) utilizes a combination of high and low points to avoid flooding of the engine compartment (21) should the vessel (1) capsize. To turn the vessel (1) a jet nozzle (12) is deflected by mechanical linkage (45). The vessel's steering wheel (11) is coordinated with jet nozzle (12) and mechanical linkage (45) to limit maximum deflection.

Abstract: A vessel equipped with a single screw, comprising a hull which is symmetrical with regard to a vertical center plane containing the center line of the hull, and a propeller shaft which is positioned laterally offset from the vertical center plane of the hull. The propeller shaft is positioned such that a ratio (d/D) is from 5 to 25%, where d represents a distance between the propeller shaft and the vertical center plane of the hull, and D represents the diameter of the propeller.

Abstract: A thrust collar is disclosed for mounting around the upper portion of the propeller of an inboard/outboard engine. Each thrust collar supports a horizontal hydrofoil wing extending laterally from the collar. A second, similar wing can be provided on an opposing side of the collar. Where the collar is used in pairs on paired engines on a catamaran hull, a single hydrofoil wing can be supported between the thrust collars. The thrust collar is preferably used in conjunction with hull lifting structures. One hull mounted hydrofoil structure is supported at the lower end of the strut extending and includes a generally curvilinear gull-wing shaped lower surface. For V-type hulls, a pair of elongataed mechanical lifting structures, symmetrically positioned on either side of the keel substantially in the vicinity of the keel are attached to the hull so as to extend generally traversedly to the sloping side surfaces of the hull intersecting at the keel.

Abstract: The stern apron is constructed as a volume body tapering to a sharp end in streamlined manner towards the stern of the ship and which at its lower outer edges is in each case wider than in the overlying region, so that the ship's resistance and the necessary propulsive power when travelling in open water is reduced and, particularly when moving astern, the propulsion and control members are protected against contact with the ice.

Abstract: A ship has a stern provided with a propeller that rotates in a plane about a horizontal midline ship axis perpendicular to this plane to displace the ship horizontally forward and a plurality of fins secured to and extending horizontally from the stern ahead of the propeller in the ship displacement direction. Each such fin is curved and has relative to this direction a leading edge directed parallel and into the direction of boundary-layer flow at this leading edge and a trailing edge extending parallel to the axis. The leading edges of this invention are normally directed upward and the fins project horizontally from the stern by a distance at most equal to the thickness of the boundary-flow layer, also measured horizontally and perpendicular to the stern at the respective fin. The fins are arranged in vertical rows on each side of the stern ahead of the propeller.

Abstract: An upstanding panel-like body is provided including top, bottom and front and rear margins and opposite side surfaces extending between those margins. The opposite side surfaces are generally vertically straight and parallel. The front and rear margins are transversely elliptically rounded and the opposite sides of the convexly rounded front margin merge rearwardly into first generally constant radius of curvature laterally outwardly convex forward opposite side partial cylindrical surfaces which in turn merge rearwardly into second generally constant radius of curvature and laterally outwardly concave mid-length opposite side surfaces merging rearwardly into third generally constant radius of curvature laterally outwardly convex rear opposite side partial cylindrical surfaces joined at their rear portions by the convexly rounded rear margin of the body.

Abstract: A seagoing vessel comprises a hull having a forwardly projecting bulb at its bow. The bulb includes an upper periphery oriented substantially horizontally and exposed above the water surface when the vessel is stationary and in a fully loaded condition. A pair of side skegs extend rearwardly from an underside of the vessel at the stern end. Propeller shafts extend through the side skegs. The side skegs and propeller shafts converge in a rearward direction. Each side skeg includes a planar outboard surface and a bulbous inboard surface, the latter inducing an outboard flow of water through a top segment of the associated propeller in a direction opposite the direction of propeller rotation. A center skeg extends between the side skeg and includes downwardly converging and rearwardly diverging sides which induce an outboard flow of water through a top segment of a respective propeller in a direction opposite the direction of propeller rotation.

Abstract: An asymmetric aftbody for the hull of a ship having a twisted shape operative to achieve higher efficiency at practically all aftbody block coefficients by improving water flow and adapted to provide a shape wherein the tangential components of the wake are distributed as favorably as possible over the entire propeller circumference, the aftbody having an upper part above the propeller shaft which is combined with a part of the hull below the propeller shaft, the sectional areas of the hull having a bulbous or a U-shaped configuration with the center lines of the sectional areas being inclined away from the vertical longitudinal plane through the propeller center in opposite directions to that of propeller rotation such that when seen from aft the bulbous or U-shaped stern below the propeller shaft forms an angle of inclination with the vertical longitudinal plane in a direction opposite to that of propeller rotation.

Abstract: A fishing boat for use with a pair of electrically powered fishing motors wherein the boat hull has double end bottom running surfaces and a bottom pod extending below the running surfaces between the bow and the stern of the hull along the center line of the hull, the pod being shaped to receive an electrical power source for the motors and having a longitudinal dimension greater than the transverse dimension of the pod and each of the dimensions being less than the corresponding dimensions of the boat hull. The boat hull has a first well molded into the bottom thereof between the bow and the adjacent end of the pod along the center line of the hull and the boat hull has a second well molded into the bottom thereof between the stern and the other end of the pod along the center line of the hull. The boat also includes a removably mounted electrically powered fishing motor in each of the first and second wells in the bottom of the boat hull.

Abstract: A clear annular space is provided around the propeller shaft shroud between the aft end of the helical channel proper and the propeller disc. The helical channel is brought far enough around the shaft shroud root so that the aft end of the web formed where the helical channel becomes tangent to the outer hull skin is at an angle not exceeding 40.degree. above the horizontal and preferably not more than 35.degree.. The overall cross-sectional taper of the afterbody takes into account the shaft shrouds as well as the rest of the hull. Because it has been found that the effectiveness of helical channels in smoothing out the torque loads on propeller blades is difficult to predict and sometimes is negative, the method of establishing the configuration by model tests is important. In that method, the radial component of water flow with respect to the propeller disc may be neglected, but both the axial and the peripheral component must be considered in establishing a favorable hull configuration.

Abstract: A marine vessel has a hull which is provided at the stern part thereof with a propeller. In order to decrease the wave resistance at the stern part of the hull, it is provided with a wave generating member which extends aft beyond the aftermost point of the full load water line. The member produces waves which are opposite in phase to and interfere with waves as produced at the stern part of the hull whereby the waves can at least partially be cancelled.

Abstract: A shaft, and especially a ship's propeller shaft, sealing assembly which comprises a solid housing structure having a central bore for receiving the shaft, the housing structure accommodating two seals spaced axially along the bore and a void chamber between the seals. The void chamber gives an indication of seal failure and its radial extent is defined by a solid inner wall of the housing structure.

Abstract: A ship construction comprises a symmetrical hull having two screw propellers which are symmetrically arranged in respect to the longitudinal central plane of the hull. A rudder is mounted aft of the screw propellers and preferably in the central plane. The propellers and the rudder are so dimensioned that the diameter of each propeller is less than the spacing between the center lines of the two propeller shafts. In addition, the distance between the axes of the propellers is equal to or less than the diameter of each propeller plus the thickness of the rudder. The arrangement provides an improved propulsive efficiency without loss in maneuverability.

Abstract: A hull for a small-sized ship has a planing type bottom and a stern having an area curve substantially the same as that of a displacement type hull, whereby during a low speed travelling period the ship is allowed to be travelled under substantially the same characteristics as those of a displacement type hull, while during a high speed travelling period it is allowed to be travelled under substantially the same travelling characteristics as those of a planing type hull.

Abstract: The stern construction has an open channel let in to each side of the hull. The channel merges with the hull at its forward end and terminates in front of the upper part of the propeller disc at its rear end. The lower side of the channel is formed by a depending part of the hull which houses the tailshaft. The upper edge of each channel joins the part of the hull above the channel along a knuckle line. The upper side of the channel is disposed at an angle of inclination to the horizontal which decreases towards the rear of the ship so as to intercept the wake of the ship progressively and divert it into the upper part of the propeller disc.The invention is applicable to full bodied ships such as tankers.

Abstract: With ships fitted with more than one propeller, it has been found that a remarkable increase in a ratio speed/power can be obtained especially in full-form ships, if the under-water portion of the ship's afterbody, at a level corresponding to the top clearance of the propellers, is divided into an upper, full body portion and a lower, narrow body part, with the transient part between said body portions being designed to form a substantially horizontal hull surface at each hull side.

Abstract: A pontoon boat having enhanced handling characteristics includes a deck, a central pontoon mounted to said deck, two outer pontoons mounted to said deck on respective opposite sides of said central pontoon, and a motor, wherein the central pontoon extends below the outer pontoons to create a V-shaped hull, and the motor is capable of causing said center and outer pontoons to plane during normal operation.