Disclosed are a propulsion device for a ship and a ship having the same. The propulsion device may include a rotational shaft, a rear propeller fixed to the rotational shaft, a front propeller rotatably supported by the drive shaft in front of the rear propeller, a counter rotation unit disposed in an installation space of a stern of a ship body and including a plurality of gears configured to reverse rotation of the rotational shaft and transmit the reversed rotation to the front propeller and a gear box configured to receive the plurality of gears, a coupling unit configured to separably connect the rotational shaft with the counter rotation unit and cut off power transmission from the rotational shaft to the counter rotation unit upon disconnection therebetween, and a rotation preventing unit configured to prevent rotation of the front propeller when the coupling unit is separated.

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.

An input shaft for the torque-transmitting connection of motor and propeller of a ship drive has input-side and output-side interfaces and a composite hollow shaft made of fiber composite material arranged therebetween. The input shaft has a section which is arranged between the input-side and output-side interfaces, is connected to the composite hollow shaft, and is made of non-flammable material. A ship includes a hull, a bulkhead running transversely to the longitudinal axis of the hull, a motor, a propeller and an input shaft described above. The input shaft of the ship is fed through the bulkhead and has the non-flammable section arranged in the region of the feedthrough through the bulkhead.

A marine propulsion device includes a propeller, a propeller shaft, a bushing, a damper, and a spacer. The propeller shaft supports the propeller. The bushing is between the propeller and the propeller shaft and is unitarily rotatable with the propeller shaft. The damper is fixed to the bushing to transmit rotation of the propeller shaft to the propeller. The spacer is spaced apart from the propeller in a back-and-forth direction in front of the bushing to position the bushing in place with respect to the propeller shaft.

A field configurable vehicle includes bladders located interior of the vehicle hull walls. One or more of the bladders can be filled with fluids of varying densities to manage the buoyancy, mass properties, and thermal heat dissipation of the vehicle.

A field configurable vehicle includes bladders located interior of the vehicle hull walls. One or more of the bladders can be filled with fluids of varying densities to manage the buoyancy, mass properties, and thermal heat dissipation of the vehicle.

Marine propellers with compression spring sleeve assemblies for driving engagement by a propeller drive shaft may include a propeller hub having an axis of rotation. A compression spring sleeve assembly may be disposed in the propeller hub. The compression spring sleeve assembly may include a drive core comprising a drive core wall. At least one drive rib may extend from the drive core wall. A shaft bore may be formed by the drive core wall. The shaft bore may be sized and configured to receive the propeller drive shaft for driving rotational engagement by the propeller drive shaft. A drive sleeve may be drivingly engaged for rotation by the drive core and drivingly engage the propeller hub for rotation. The drive sleeve may have a drive sleeve body. At least one axial deformation element may have at least one deformation passageway in the drive sleeve body of the drive sleeve. The axial deformation element or elements may be oriented substantially parallel to the axis of rotation of the propeller hub and substantially encased by the drive sleeve body.

A drive mechanism and a method for installing a drive mechanism for a fluke drive. The drive mechanism converts rotary movement into pivoting movement, and includes a first part, a second part having second-part engagement means, a third part having third-part engagement means; and a rod part having a first and a second end. The second part is rotatable in relation to the first part along a rotary axis which is common to the first part and the second part. The third part is reciprocatingly pivotable in relation to the first part about a first pivot axis which is not the same as the rotary axis. The first pivot axis is fixed in relation to the first part. The second-part engagement means is arranged eccentrically with respect to the rotary axis. The first end engages with the second-part engagement means. The second end engages with the third-part engagement means.

A propeller mother and child transmission assembly with dual protection is provided, which includes a child transmission shaft sleeve and a mother transmission shaft sleeve. An outer peripheral surface of the child transmission shaft sleeve is fixedly provided with a plurality of first transmission protrusions and a plurality of second transmission protrusions, each of the first transmission protrusions and each of the second transmission protrusions are arranged alternately; the mother transmission shaft sleeve is provided with a plurality of first transmission recesses and a plurality of second transmission recesses, each of the first transmission recesses and each of the second transmission recesses are arranged alternately. Each first transmission protrusion is threaded through each first transmission recess, and each second transmission protrusion is threaded through each second transmission recess. The present application has an effect of preventing the transmission assembly from easily losing its transmission capability.

A marine engine coupler for connecting a sterndrive input shaft to an engine flywheel. A splined central shaft connects the sterndrive input shaft to the coupling. Polyurethane dampers interface between the engine to the sterndrive to reduce vibration. There is a visual indicator on the coupler to allow the user to assess the integrity of the dampening material and give the user an indication that the dampening materials needs to be replaced.