Abstract: A marine propeller drive (1) for boats, including a gearbox (10) for a motor transmission and an associated impelling propeller (12). The propeller (12) is provided with a propeller hub (14), the main peripheral cross-section dimension (A) of which is less than the main peripheral cross-section dimension (B) of the gearbox (10) and where a transition cone (18) is located between the gearbox (10) and the propeller hub (14). The transition cone (18) has a front end (20) located in connection with the gearbox (10), where the front end (20) has an initial peripheral cross-section dimension (C) essentially corresponding to the main peripheral cross-section dimension (B) of the gearbox (10). A rear end (22) of the cone is located in connection with the propeller hub (14), where the rear end (22) has a connecting peripheral cross-section dimension (D) essentially corresponding to the main peripheral cross-section dimension (A) of the propeller hub (14).

Abstract: A rotatable propeller drive (1) for a boat, where the propeller drive (1) includes an upper fixing plate (4) adapted for rotationally fixed attachment to the hull bottom (2) of the boat. A lower underwater housing (6) is provided on which at least one propeller (10, 10a, 10b) is mounted, which underwater housing (6) is mounted rotatably in the fixing plate (4) about an essentially vertical axis of rotation (8). An exhaust duct (50) is provided with an exhaust exit (14) located in the underwater housing (6). The exhaust duct (50) has an upper duct section (54) which extends through the fixing plate (4) and has an outlet opening (62) located in proximity to an opposite inlet opening (60) in a lower duct section (56) which extends through the underwater housing (6). One of the outlet opening (62) and inlet opening (60) overlaps the other at least within a limited first rotation angle range for the propeller drive (1).

Abstract: A transport package for a boat propeller drive (2) that has a suspension fork (6) for suspending the drive in a suspension plate mounted on the stern transom of a boat. The package includes a bottom plate (14) and a cover that can be removed from the bottom plate. The drive is held in a fixed position in the package by means of upper and lower spacing elements (21, 22). When the cover and the upper spacing elements are removed, the suspension fork is exposed and the drive is held stable in an upright position by the bottom plate together with the lower spacing elements to serve as a mounting fixture.

Abstract: An outboard drive for boats, having a steerable underwater housing (1) which has a wing-profiled portion (2). Projecting at an approximately 90 degree angle from the aft part of one side face (31) of the wing profile is a face portion (32), the lateral extent of which amounts to about 1-2% of its distance to the steering shaft (36) of the wing profile. As a result of this construction, a lifting force will be generated during forward travel in the water. The face portion is configured on that side of the profile which produces a lifting force counter-directional to a steering force, deriving from the motor torque, upon the wing profile.

Abstract: Method and arrangement for accommodating indirect ascertainment of fill-characteristics of fluid tanks on marine vessels. The invention includes providing an experientially-based mapping of volume characteristics of a fluid tank positioned on a marine vessel that are correlated with respect to measurable fluid surface positions within the fluid tank. In consideration of this volume characteristic mapping, fluid fill condition information is output for operator use based on quantification of a parameter other than sensed fluid level in the fluid tank. While it is contemplated that the other parameter may be any characteristic that readily reads back to the volume characteristic mapping, it is particularly advantageous, and a preferred embodiment of the invention, that the other parameter be a volumetric quantification of fluid consumed out of the tank that can be compared to an earlier ascertained tank volume.

Abstract: A propeller spinner (5) for a marine propeller (1) having multiple propeller blades (2) attached to a propeller hub (3) that is adapted for attachment to a propeller shaft (4) and includes a sacrificial anodic material for protecting the propeller shaft (4) and/or propeller hub (3) from corrosion. There is included a hollow spinner cone (6) made of a non-anodic material and the spinner cone (6) has at least one perforation in its outer peripheral surface. An anodic insert body (9) that is made of the sacrificial anodic material constitutes an insert body (9) that is substantially contained within the hollow spinner cone (6). The insert body (9) has at least one radical protrusion (10) extending at least partially through said perforation (7) in the spinner cone (6).

Abstract: A method of steering a planning V-bottomed boat with double individually steerable outboard drive units with underwater housings (6), which extend down from the bottom (1) of the boat. When running at planning speed straight ahead, the underwater housings are set with “toe-in”, i.e. inclined towards each other with opposite angles (alpha) of equal magnitude relative to the boat centre line (b). When turning, the inner drive unit is set with a greater steering angle than the outer drive unit.

Abstract: System and method for providing a hydraulic system (1) arranged between a first marine propulsion device (2, 42) and a second marine propulsion device (3, 43). Each propulsion device is arranged to rotate about a respective axis (6, 7, 46, 47) at a distance from one another. The system (1) includes a first hydraulic piston-cylinder device (8, 50) and a second hydraulic piston-cylinder device (13, 55) arranged between the second propulsion device (2, 3, 42, 43) and an element (12, 17, 54, 59) fixed in relation to the axis (6, 7, 46, 47). Connecting the piston-cylinder devices (8, 13, 50, 55) to one another via a first hydraulic circuit (18, 60) and a second hydraulic circuit (19, 61) leads to rotation of one propulsion device (2, 3, 42, 43) resulting in rotation of the other propulsion device (2, 3, 42, 43). The method and arrangement afford a tie bar function.

Abstract: A propeller spinner (5) for a marine propeller (1) having multiple propeller blades (2) attached to a propeller hub (3) that is adapted for attachment to a propeller shaft (4) and includes a sacrificial anodic material for protecting the propeller shaft (4) and/or propeller hub (3) from corrosion. The invention includes a hollow spinner cone (6) made of a non-anodic material and the spinner cone (6) has at least one perforation in its outer peripheral surface. An anodic insert body (9) that is made of the sacrificial anodic material constitutes an insert body (9) that is substantially contained within the hollow spinner cone (6). The insert body (9) has at least one radical protrusion (10) extending at least partially through said perforation (7) in the spinner cone (6).

Abstract: A pulling marine propeller (1) including multiple propeller blades (4) attached to a propeller hub (5). The propeller hub (5) is attachable to a propeller shaft (9) extending from a drive housing (10) located downstream of the propeller (1). The invention is especially characterized by the fact that the propeller hub (5) is provided with an annular, radially outwardly flared peripheral portion (11) at an aft end (12) thereof. The flared portion (11) is arranged to axially overlap a front end shoulder portion (13) of the drive housing (10).

Abstract: Apparatus for adapting a propeller system including a propeller shaft (15, 16) and a propeller (7, 8) adapted to be mounted on the propeller shaft (15, 16). The propeller system includes a propeller (7, 8) connected in a rotationally fixed manner to a propeller shaft (15, 16), the propeller shaft (15, 16) having a portion provided with splines (19, 20) which cooperate with corresponding splines (25, 28) inside the hub (23, 26) of the propeller (7, 8) in order to obtain the rotationally fixed connection, where the splines (19, 20) on the propeller shaft (15, 16) and in the hub (23, 26) of the propeller (7, 8) are helical, with a predetermined oblique angle (?, ?). The invention also relates to a propeller shaft (15, 16) and a propeller (7, 8) which are intended to be used in the propeller system.

Abstract: Method and arrangement for accommodating indirect ascertainment of fill-characteristics of fluid tanks on marine vessels. The invention includes providing an experientially-based mapping of volume characteristics of a fluid tank positioned on a marine vessel that are correlated with respect to measurable fluid surface positions within the fluid tank. In consideration of this volume characteristic mapping, fluid fill condition information is output for operator use based on quantification of a parameter other than sensed fluid level in the fluid tank. While it is contemplated that the other parameter may be any characteristic that readily reads back to the volume characteristic mapping, it is particularly advantageous, and a preferred embodiment of the invention, that the other parameter be a volumetric quantification of fluid consumed out of the tank that can be compared to an earlier ascertained tank volume.

Abstract: Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. In the rear edge of the underwater housing, a rudder blade is mounted for pivoting about a vertical rudder axis.

Abstract: Method and arrangement for a marine combustion engine exhaust system. The arrangement includes at least two substantially upstanding exhaust pipe arms that are coupled together in common closed fluid communication with a stem exhaust pipe. A pressure equalizer is fluidly connected between the upstanding exhaust pipe arms. The pressure equalizer is configured to provide sufficient fluid passage from each exhaust pipe arm to another to prevent flow back of sea water to a marine combustion engine associated therewith.

Abstract: Boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers arranged on that side of the housing facing ahead. Arranged in that end portion of the underwater housing facing astern is an exhaust discharge outlet for discharging exhaust gases from an internal combustion engine connected to the propeller drive.

Abstract: Method and apparatus for adapting a propeller system including a propeller shaft (15, 16) and a propeller (7, 8) adapted to be mounted on the propeller shaft (15, 16). The propeller system includes a propeller (7, 8) connected in a rotationally fixed manner to a propeller shaft (15, 16), the propeller shaft (15, 16) having a portion provided with splines (19, 20) which cooperate with corresponding splines (25, 28) inside the hub (23, 26) of the propeller (7, 8) in order to obtain the rotationally fixed connection, where the splines (19, 20) on the propeller shaft (15, 16) and in the hub (23, 26) of the propeller (7, 8) are helical, with a predetermined oblique angle (alpha, beta). The invention also relates to a propeller shaft (15, 16) and a propeller (7, 8) which are intended to be used in the propeller system.

Abstract: Boat propeller transmission with a horizontal input shaft, a bevel gear set, a vertical intermediate shaft, an additional bevel gear set, and at least one horizontal propeller shaft. Between the bevel gear sets, a two-speed planetary gear set is engaged, to provide two gear speeds in the same direction between the input shaft and the propeller shaft. A control unit controls the shifting between the low and high gear speed. A sensor senses the position of a gear selector. When the gear selector is in the reverse position, the control unit locks the planetary gear set in the high speed position, regardless of the engine speed.

Abstract: System and method for protecting a cooling system of a liquid-cooled engine using a protective material. This system enables a boat operator to flush the cooling system using salt, brackish or fresh water. In one embodiment, the system includes a reservoir, a dispenser and a connection device. The reservoir is capable of containing a protective material that can include, among others properties, anticorrosive properties. The dispenser controls release of the protective material from the reservoir and can be controlled manually or through a control unit. The system is coupled with the cooling system downstream from raw water intake ports and upstream from a terminal end of the cooling system as the cooling system terminates at the exhaust port. The protective fluid can be dispensed using gravity feed or a pump.

Abstract: An hydraulic installation in a boat hull for swinging a properller rig pivotably suspended in a shell on a boat transom using a piston-cylinder device arranged in a hydraulic control circuit. A control valve included in the hydraulic circuit for controlling the flow to and from the hydraulic cylinder is sealingly mounted in a through-opening in the shell, so that one side of the valve faces outwardly towards the propeller rig in order to be subjected to water spray during driving and serve as an oil cooler.