A cooling system for an outboard motor of a marine vessel is provided. The cooling system includes an oil sump housing having an inner housing wall and an outer housing wall. The inner housing wall defines a transmission mounting cavity, and the inner housing wall and the outer housing wall defines an oil containment cavity that at least partially surrounds the transmission mounting cavity. The cooling system further includes a first sprayer nozzle and a second sprayer nozzle. Both the first sprayer nozzle and the second sprayer nozzle are coupled to the oil sump housing and configured to spray cooling fluid within the transmission mounting cavity onto an inner surface of the inner housing wall.

An intake plenum is for a marine engine, the marine engine having first and second throttle devices for controlling flow of intake air to the marine engine. The intake plenum has an airbox providing an expansion volume, first and second inlets that convey the intake air in parallel to the expansion volume, first and second outlets that convey the intake air in parallel from the expansion volume to the first and second throttle devices, and first and second Helmholtz-style attenuator devices located at the first and second outlets, respectively. Together the first and second inlets, expansion volume, and first and second Helmholtz-style attenuator devices are configured to attenuate different frequencies of sound emanating from the marine engine via the first and second outlets.

An outboard motor is provided with: an engine cover in which a first outside air inlet port, an exhaust port, and second outside air inlet ports are formed; and a lower housing that is disposed below the engine cover. The engine cover is provided with a front guide and a rear guide that guide outside air, introduced respectively from the first outside air inlet port and the second outside air inlet ports into the engine cover, downward in the gravity direction.

A V8 engine, each bank of which is configured such that four crank pins connected to four piston pins via a connecting rod are positioned at 90° intervals when viewed from one end of a crankshaft. The four crank pins on the bank side are offset by 60° relative to the four crank pins on the bank side when viewed from the one end.

A solar powered airship includes a cabin, at least one fuselage having an interior volume filled with a volume of a lighter-than-air gas such as helium, and a wing affixed to the fuselage. A plurality of solar panels are affixed to the wing and to the fuselage. A plurality of rotors are affixed to the wing, wherein each rotor is powered via an electric motor having a battery that is operably connected to the plurality of solar panels, thereby allowing for continuous flight. The solar powered airship may further include propellors, which may also be powered via the solar panels, or which may include gasoline powered motors. The solar powered airship can include various configurations and numbers of fuselages, wings, rotors, and propellors.

A solar powered airship includes a cabin, at least one fuselage having an interior volume filled with a volume of a lighter-than-air gas such as helium, and a wing affixed to the fuselage. A plurality of solar panels are affixed to the wing and to the fuselage. A plurality of rotors are affixed to the wing, wherein each rotor is powered via an electric motor having a battery that is operably connected to the plurality of solar panels, thereby allowing for continuous flight. The solar powered airship may further include propellors, which may also be powered via the solar panels, or which may include gasoline powered motors. The solar powered airship can include various configurations and numbers of fuselages, wings, rotors, and propellors.

An outboard motor to be attached to a hull of a marine vessel that reduces an amount of oil in blow-by gas reaching a breather chamber includes an internal combustion engine including a cylinder block including at least one cylinder. The cylinder block includes two blow-by gas flow paths to guide blow-by gas from a crank chamber to a breather chamber, and the internal combustion engine is oriented such that a crankshaft extends along a direction perpendicular or substantially perpendicular to a bottom of the hull when the marine vessel is sailing.

A vessel propulsion apparatus includes an engine and a propulsion unit to be driven by the engine. The engine includes a cylinder head including a combustion chamber and a pair of intake openings to communicate with the combustion chamber. The engine further includes a pair of intake ports respectively including a pair of downstream portions respectively connected to the pair of intake openings. A distance between the pair of downstream portions decreases toward the pair of intake openings.

Combustion air intake ports are provided on left and right side faces of an upper part of an engine cover. An outer louver is disposed to confront the combustion air intake port, and an inner louver is disposed inward of the outer louver at a predetermined interval to face the outer louver. The combustion air received from the combustion air intake port passes through the outer louver and the inner louver and is guided to the engine unit from the guide hole. In this case, a splash of water is dispersed in the outer louver, and a large-sized water droplet falls down due to its self-weight before the combustion air reaches the inner louver, so that a small-sized water droplet can be collected and removed using inertial impaction at the inner louver. Therefore, it is possible to effectively separate water.

A pump device includes a first case, a second case, a sacrificial anode. The first case has a channel in which hydraulic fluid flows. The second case provides in contact with the first case. The sacrificial anode is coupled to one of the first case and the second case and suppresses corrosion of the first case and the second case. At least one of the first case and the second case includes an insulating section that interrupts electric coupling between the first case and the second case. The pump device further includes a valve member provided in the channel, controlling the flow of the hydraulic fluid flowing in the channel, and electrically coupling the first case and the second case.