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Match Document Document Title
7556548 Exhaust device for outboard motor  
An exhaust device for an outboard motor includes an engine having a plurality of cylinders, a first expansion chamber case for collecting exhaust from a first part of the plurality of cylinders and...
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...
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...
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...
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...
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...
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,...
6409557 Exhaust arrangement for outboard motor  
An outboard motor includes an improved arrangement for an exhaust system, in association with a lubricant tank and a cooling system, for a four-cycle internal combustion engine that powers the...
6375528 Adjustable variable vent opening plugs for engine exhaust  
A vent plug includes a main body configured to be secured within an opening in a wall of a gear case in flow communication with an exhaust passageway through the gear case. The vent plug main body...
6224434 Pump jet with axial directional flow control device for thrust modulation  
A pump jet in which the axial flow of water through the device is controlled by bleeding exhaust gas into the pump jet water stream, thereby producing a thrust loss. The addition of gas into the...
6190218 Pump jet with redirected exhaust gas through stator vane for drag reduction  
An ETV-type pump jet having a stator housing with an attachment for minimizing the mismatches between the velocity and direction of the exhaust gas stream flowing out of a stator vane outlet and...
6010380 Marine exhaust vented forward of propeller hub  
An exhaust system for marine propulsion units passes engine exhaust gas out through lateral holes in the lower unit casing at the level of the propeller shaft that communicate between an exhaust...
5984742 Outboard motor engine arrangement  
An arrangement for an engine positioned in a cowling of an outboard motor and having an output shaft arranged to drive a water propulsion device of the motor is disclosed. The engine has a first...
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...
5954554 Outboard drive exhaust system  
An outboard drive involves an improved exhaust system that increases the reverse thrust produced by the outboard drive. The exhaust system includes a first exhaust passage and a second exhaust...
5916003 Propeller vent plug with fluid passage  
A propeller device is provided with vent apertures and plugs which fit into the vent apertures to be retained in position during use of the propeller device. The vent plugs are provided with...
5857880 Through-the-hub-propulsion unit exhaust  
An exhaust system for an outboard motor discharges exhaust gases in front of the propeller for improved acceleration. The discharge of exhaust gases upstream of the propeller produces a cavitation...
5816869 Propeller for varying the exhaust length  
A propeller for a marine propulsion system that provides variable length exhaust paths depending upon the speed of the boat and motor. The propeller includes a propeller hub and an exhaust tube...
5795200 Contra-rotating rotor unit  
A marine propulsion unit has two contra-rotating propellers (15, 16) driven by a single shaft (25) through gearing which includes a set of static planetary gears (40), an external gear (30), and an...
5766048 Exhaust system for outboard drive  
An exhaust system for an marine drive discharges exhaust gases between front and rear propellers of a counter-rotating propeller system. The discharge of exhaust gases between the propellers...
5527195 Flow through marine propeller  
A marine propeller (10) has an integral aft skirt portion (30, 74) with a plurality of slots (34, 36, 38, 40, 42, 44) extending forwardly from the trailing end (32, 72) and dividing the skirt...
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...
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...
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...
5295879 Sound deadening pad for an outboard motor  
A marine propulsion device having a powerhead drivingly connected to a propeller shaft, a lower unit rigidly connected to the powerhead and supporting the propeller shaft, a swivel bracket spaced...
5197910 Outboard motor  
A number of embodiments of small lightweight outboard motors adapted to be mounted on a watercraft that does not have a transom through a mounting bracket that spans the sides of the hull and is...
5145428 Shrouded propeller system for a sailboat  
A propeller system for an outboard motor, comprising a revised propeller, a symmetrical or Kort-type accelerating nozzle, and re-routed exhaust passages, is described. This system permits...
5112260 Marine propulsion device exhaust system  
A marine propulsion device comprising a propulsion unit which is adapted to be mounted on a boat transom and which includes an exhaust passageway having an upstream end adapted to communicate with...
5078632 Motorboat propeller  
To reduce engine exhaust gas pressure behind a motorboat propeller formed with a boss for educing engine exhaust gas therethrough, without forming a trumpet-shaped boss end and without allowing...
4927390 Gas exhaustion device for inboard/outboard engine  
An inboard/outboard drive arrangement and specifically an improved exhaust joint therefor wherein at least one of the rigid conduits of the exhaust system is provided with a projection to engage...
4861296 Marine propulsion device exhaust system  
Disclosed herein is a marine propulsion device comprising a stern drive unit including a gimbal housing adapted to be fixed to a boat transom, a gimbal ring connected to the gimbal housing for...
4834683 Apparatus for reducing exhaust gas pressure in outboard and inboard/outboard motors  
A device for increasing the efficiency of operation of an internal combustion engine used in outboard and inboard/outboard motors comprised of a generally cylindrical member having inner and outer...
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...
4802872 Regulated aeration of gases exhausting through a propeller  
Aeration holes defined by an outer propeller hub include closure devices which seal the aeration holes during rotation of the propeller due to centrifugal forces in a predetermined speed of...
4778419 Reverse thrust propeller  
A marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller shaft and including a lower unit exhaust passageway, and a propeller adapted to be submerged...
4764136 Marine drive means  
The invention relates to a marine drive comprising a water-cooled internal combustion engine mounted in a boat, a shield mounted on the transom stern of the boat and supporting a universal joint...
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...
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...
4545771 Propeller  
A propeller and exhaust system for an outboard motor wherein performance is improved by permitting the flow of some exhaust gases in proximity to the propeller blades at low speeds so as to aerate...
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...
4511339 Through-hub exhaust propeller assembly  
A boating propeller for controlling the discharge of engine exhaust gases from the central hub of a boating motor unit by making provision for confining said gases to the inner most fraction of the...
4447214 Anti-ventilation means for marine gear case  
The marine propulsion device includes a lower unit having a gear case normally submerged in water and arranged to discharge engine exhaust gas rearwardly from the rear end into the water exteriorly...
4436514 Exhaust means for marine propulsion unit  
Marine propulsion unit having a propeller assembly formed with exhaust gas passages through the propeller hub. An outer pipe is provided to encircle the propeller hub with a radial spacing and has...
4388070 Propeller exhaust hub and shroud  
A propeller for controlling the discharge of gases and cooling water exhausting from the central hub of an outboard motor unit comprising a cylindrical shroud surrounding the propeller hub to...
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...
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...
4312422 Exhaust silencer for outboard engine with a reflection chamber  
An exhaust silencer for an outboard engine including an expansion chamber for reducing the exhaust noise. A reflection chamber having an open end and a closed end is placed with its open end...
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...
4304558 Marine propulsion device including propeller shroud  
The marine propulsion device includes a lower unit normally submerged in water, a propeller carried by the lower unit, and an annular shroud surrounding the propeller blades and defining a...
4295835 High speed outboard drive unit  
An engine driven outboard drive unit for propelling a watercraft has a vertical drive shaft driving a horizontal propeller shaft on which a propeller is mounted. The drive unit has a gearcase...
Matches 1 - 50 out of 76 1 2 >