Abstract: The invention relates to a method and apparatus for installing a propeller assembly (1) in an opening (9) in the bottom (8) of a swimming vessel and for removing the propeller assembly (1) from the opening (9). The propeller assembly (1) comprises an underwater section (2) including the actual propeller and a top section (3) inside the vessel, between which is fitted a flange element (4) for tightly sealing the opening (9). The apparatus comprises a hoisting chamber (7), which is fitted in the opening (9) in the bottom of a vessel, extends inside the vessel to above waterline and surrounds the top section (3) of the propeller assembly. The apparatus further includes guide elements for guiding the propeller assembly (1) during the course of lifting or lowering.

Abstract: The invention relates to a method and apparatus for installing a propeller assembly in an opening in the bottom of a swimming vessel and for removing the propeller assembly from the opening. The propeller assembly comprises an underwater section including the actual propeller and a top section inside the vessel, between which is fitted a flange element for tightly sealing the opening. The apparatus comprises a hoisting chamber, which is fitted in the opening in the bottom of a vessel, extends inside the vessel to above waterline and surrounds the top section of the propeller assembly. The apparatus further includes guide elements for guiding the propeller assembly during the course of lifting or lowering. In the method, the propeller assembly is lifted away by way of the top of the hoisting chamber after clampings of the propeller assembly to the hull of a vessel are unfastened and hoisting means are secured to the propeller assembly. Installation proceeds in a reversed order.

Abstract: A propeller device for a ship rotates 360.degree. and may be raised when it is not in use. The transmission system of the propeller device includes a drive shaft for the propeller device, which is placed in the upper part of such propeller device. The shaft is driven by the shaft of the engine and transmits rotation via an upper angular gearbox to a vertical shaft and a lower angular gearbox to a propeller shaft at the bottom part of the propeller device. A coupling is fitted between the drive shaft of the propeller device and the engine shaft rotating same. A coupling member of the coupling permits the propeller device to be uncoupled from the engine and to be displaced in the axial direction, so that the propeller device may be raised.