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| Number | Title | Issue Date |
| 7387556 | Exhaust system for a marine propulsion device having a driveshaft extending vertically through a bottom portion of a boat hull An exhaust system for a marine propulsion device directs a flow of exhaust gas from an engine located within the marine vessel, and preferably within a bilge portion of the marine vessel, through a housing which is rotatable and supported below the marine vessel. Th... | 06/17/2008 |
| 7258710 | Maritime emissions control system An Advanced Maritime Emissions Control System (AMECS) includes several Exhaust Intake Bonnets (EIBs) of different size and/or shape, an Emissions Capture System (ECS), and an Advanced Maritime Emissions Control Unit (AMECU) mounted on an Unpowered Seagoing Barge (US... | 08/21/2007 |
| 7186157 | Turning propeller drive for a boat 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 o... | 03/06/2007 |
| 7056092 | Modular propeller A modular propeller comprises a center hub with an integrated front cap and an aluminum core encapsulated with fiber-reinforced composite polymer resin. A set of replaceable blades have bases that slip into and interlock with corresponding slots in the center hub. A... | 06/06/2006 |
| 6887117 | Pump jet with an exhaust bypass and associated methods A marine outboard motor includes a power unit and a pump jet. The power unit includes a drive output and an exhaust outlet, and the pump jet includes a rotor hub and a rotor carried thereby. The rotor hub is connected to the drive output of the power unit for select... | 05/03/2005 |
| 6722934 | Marine jet drive with through-the-nozzle exhausting A marine jet drive having through-the-nozzle engine exhaust, thereby to avoid or minimize noxious odors, noise and heat problems. A method for improving marine jet drive engine performance, including producing suction to facilitate exhaust flow from the engine by di... | 04/20/2004 |
| 5967866 | Texture gearcase for a marine propulsion system A lower unit for a marine propulsion system has a flow disrupter positioned along the side wall of the vertical strut above the torpedo gearcase. The strut has a high pressure side and low pressure side which results from the strut being positioned at an ... | 10/19/1999 |
| 5470263 | Method and apparatus for improving reverse thrust of a marine drive A marine drive has a reverse thrust cup on the propeller shaft between the propeller hub and the rear retaining nut. The reverse thrust cup permits the propeller hub to slide on the propeller shaft fore and aft. When the marine drive is in the forward dir... | 11/28/1995 |
| 5423701 | Propeller arrangement for a marine propulsion unit A double propeller arrangement for a marine propulsion unit, for example of the type which includes a so-called stern-drive. Each propeller has a hub consisting of an inner sleeve with splines for attachment to a propeller shaft, an outer sleeve with prop... | 06/13/1995 |
| 5352141 | Marine drive with dual propeller exhaust and lubrication A marine drive (10) has a spool (36) positioned in the lower horizonal bore (28) and supporting a dual propeller shaft assembly (38, 40). An exhaust passage (130) includes a passage (132) in the drive housing (26) communicating with the horizontal bore (2... | 10/04/1994 |
| 5325662 | Advanced exhaust discharge for pump jet propulsion apparatus An exhaust-through-the-hub system described herein includes an apparatus for discharge of exhaust gases from a marine outboard motor to the outer perimeter of an attached pump jet. Exhaust gas is ducted downwardly through the central body of the motor and... | 07/05/1994 |
| 4820210 | Lower gearcase shift mechanism for marine propulsion device The invention provides a marine propulsion device having a lower unit including a power transmission mechanism comprising a bevel gear having a first clutch element, a propeller shaft having a second clutch element and mounted for rotational movement and ... | 04/11/1989 |
| 4676758 | Combined cutter and bypass for propeller A motor-driven marine propeller is disclosed for propelling a marine vessel. The propeller includes a hub member driven by the motor and a can member disposed coaxially relative to the hub member the can member having a fore and an aft end. The hub member... | 06/30/1987 |
| 4578040 | Fish line entering prevention device for marine propeller Several embodiments of propeller constructions employing an improved fish line and weed cutting device that extends into a recess formed in the lower housing. In each embodiment, the cutting member is disposed radially inwardly of the recess to define a g... | 03/25/1986 |
| 4540369 | Counterrotating dual-propeller boat drive A propeller assembly is usable in combination with a watercraft drive unit having a generally horizontal drive support tube fixed on the craft and a drive shaft projecting from the rear end of the support and rotatable about a drive axis. The drive assemb... | 09/10/1985 |
| 4373922 | Outboard propulsion gearcase An outboard drive unit for a watercraft having a through-the-propeller hub exhaust system for engine exhaust has a bearing support member (22) which carries the propeller shaft (18) and separates the exhaust passages from the propeller shaft gears (24) an... | 02/15/1983 |
| 4331429 | Symmetrical propeller A propeller (18) having an exhaust discharge passage (22) through the propeller hub has blades (24) symmetrical in thickness about the nose-tail pitch line and symmetrical in plan form about a rake line (26). The propeller (18) is particularly effective t... | 05/25/1982 |
| 4306867 | Apparatus for increasing the rearward propulsion of boat motors provided with reverse gears The invention relates to an accessory for outboard motors, Z-drives for boats or the like, the exhaust gas of which is normally conducted through the propeller hub into the water. By means of a valve system, which is suitably automatically changed over by... | 12/22/1981 |
| 4023353 | Multi-flow marine jet-propulsion apparatus An outboard marine propulsion apparatus has a rotor unit axially displaceable between forward and reverse operating positions. In the forward position, concentric horizontal paths through the apparatus are provided for rearward discharge of the propulsive... | 05/17/1977 |
| 3947151 | Hollow hub marine propeller with anticavitation groove This invention relates to hollow hub marine propellers provided with an external groove girdling the hub disposed between the propeller blades and the rear hub opening. The walls of the groove or annular cavity do not extend outwardly of the hub and there... | 03/30/1976 |
