A marine drive has an internal combustion engine that rotates a propulsor shaft that is operatively coupled to a propulsor to impart a propulsive thrust in water. The marine drive has a gearcase housing having an upper portion above a lower portion, the lower portion supporting the propulsor shaft. An exhaust passage in the gearcase housing is configured to convey exhaust gas from the internal combustion engine. An exhaust outlet on the upper portion of the gearcase housing is configured to discharge the exhaust gas from the exhaust passage to the water. The exhaust outlet faces the propulsor so that the exhaust gas is discharged into the water and towards the propulsor so as to aerate the water encountered by the propulsor.

A marine drive has an internal combustion engine that rotates a propulsor shaft that is operatively coupled to a propulsor to impart a propulsive thrust in water. The marine drive has a gearcase housing having an upper portion above a lower portion, the lower portion supporting the propulsor shaft. An exhaust passage in the gearcase housing is configured to convey exhaust gas from the internal combustion engine. An exhaust outlet on the upper portion of the gearcase housing is configured to discharge the exhaust gas from the exhaust passage to the water. The exhaust outlet faces the propulsor so that the exhaust gas is discharged into the water and towards the propulsor so as to aerate the water encountered by the propulsor.

A pump jet apparatus for a motor includes an annular exhaust channel to receive exhaust gas from the motor. At least one hollow exhaust vane extends radially from a vane hub surrounding the annular exhaust channel. The at least one hollow exhaust vane is in flow communication with the annular exhaust channel to discharge the exhaust gas received from the motor through an exhaust discharge outlet. An impeller driven by the motor is mounted rearward of the annular exhaust channel and the at least one hollow exhaust vane and exhaust outlet.

A pump jet apparatus for a motor includes an annular exhaust channel to receive exhaust gas from the motor. At least one hollow exhaust vane extends radially from a vane hub surrounding the annular exhaust channel. The at least one hollow exhaust vane is in flow communication with the annular exhaust channel to discharge the exhaust gas received from the motor through an exhaust discharge outlet. An impeller driven by the motor is mounted rearward of the annular exhaust channel and the at least one hollow exhaust vane and exhaust outlet.

A marine drive has an internal combustion engine that rotates a propulsor shaft that is operatively coupled to a propulsor to impart a propulsive thrust in water. The marine drive has a gearcase housing having an upper portion above a lower portion, the lower portion supporting the propulsor shaft. An exhaust passage in the gearcase housing is configured to convey exhaust gas from the internal combustion engine. An exhaust outlet on the upper portion of the gearcase housing is configured to discharge the exhaust gas from the exhaust passage to the water. The exhaust outlet faces the propulsor so that the exhaust gas is discharged into the water and towards the propulsor so as to aerate the water encountered by the propulsor.

A marine drive has an internal combustion engine that rotates a propulsor shaft that is operatively coupled to a propulsor to impart a propulsive thrust in water. The marine drive has a gearcase housing having an upper portion above a lower portion, the lower portion supporting the propulsor shaft. An exhaust passage in the gearcase housing is configured to convey exhaust gas from the internal combustion engine. An exhaust outlet on the upper portion of the gearcase housing is configured to discharge the exhaust gas from the exhaust passage to the water. The exhaust outlet faces the propulsor so that the exhaust gas is discharged into the water and towards the propulsor so as to aerate the water encountered by the propulsor.

A two-piece axle bushing for marine propeller includes a first transmission member including an accommodation chamber and longitudinal inner ribs spaced around an inner perimeter of the accommodation chamber, and a second transmission member, which includes a tube shaft that includes a first transmission segment inserted into the accommodation chamber and including longitudinal outer ribs spaced around the outer perimeter thereof and respectively movably inserted into one respective buffer space of the first transmission member and selectively engageable with one respective longitudinal inner rib and a second transmission segment connected to the first transmission segment, and a shock absorber fixedly surrounding the outer perimeter of the second transmission segment. Thus, the two-piece axle bushing of the present invention can generate power hysteresis effects when the engine starts up, reducing vibration due to a sudden high torque and further enhancing marine propeller start-up stability and smoothness.

A pump jet apparatus for a motor includes an annular exhaust channel to receive exhaust gas from the motor. At least one hollow exhaust vane extends radially from a vane hub surrounding the annular exhaust channel. The at least one hollow exhaust vane is in flow communication with the annular exhaust channel to discharge the exhaust gas received from the motor through an exhaust discharge outlet. An impeller driven by the motor is mounted rearward of the annular exhaust channel and the at least one hollow exhaust vane and exhaust outlet.

A pump jet apparatus for a motor includes an annular exhaust channel to receive exhaust gas from the motor. At least one hollow exhaust vane extends radially from a vane hub surrounding the annular exhaust channel. The at least one hollow exhaust vane is in flow communication with the annular exhaust channel to discharge the exhaust gas received from the motor through an exhaust discharge outlet. An impeller driven by the motor is mounted rearward of the annular exhaust channel and the at least one hollow exhaust vane and exhaust outlet.

THIS invention relates to a propeller and more particularly, but not exclusively, to a propeller for use with inboard and outboard boat engines. The propeller includes a hollow hub and a plurality of primary blades extending substantially radially outwardly from the hub, with each primary blade including a blade face, a blade back and a root section. The propeller is characterized in that a set of secondary blades are provided inside the hub, and that an inner volume of the hub is in flow communication with a volume radially outwardly of the propeller hub.