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The present application is a method and apparatus for moving and steering a vessel traveling in water. The arrangement for moving and steering a vessel includes a propulsion unit having a chamber positioned outside the vessel equipment for rotating a propeller arranged in connection with the chamber

The present application is a method and apparatus for moving and steering a vessel traveling in water. The arrangement for moving and steering a vessel includes a propulsion unit having a chamber positioned outside the vessel equipment for rotating a propeller arranged in connection with the chamber, and a shaft means connected to the chamber for supporting the chamber in a rotatable manner at the hull of the vessel. At least one hydraulic motor if used for turning the shaft means in relation to the hull of the vessel for steering the vessel. The arrangement also includes a means for altering the rotational displacement of the hydraulic engine.

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1. An arrangement for moving and steering a vessel traveling in water, said arrangement comprising: a propulsion unit (6) comprising a chamber (5) positioned outside the vessel, equipment for rotating a propeller (4) arranged in connection with said chamber, and a shaft means (8) connected to sai

1. An arrangement for moving and steering a vessel traveling in water, said arrangement comprising: a propulsion unit (6) comprising a chamber (5) positioned outside the vessel, equipment for rotating a propeller (4) arranged in connection with said chamber, and a shaft means (8) connected to said chamber (5) for supporting said chamber, in a rotatable manner, at the hull (9) of said vessel, at least one hydraulic motor (20) for turning said shaft means (8) in relation to the hull (9) of said vessel for steering said vessel, wherein the arrangement comprises means (22) for variably altering the displacement volume of the hydraulic motor (20). 2. An arrangement according to claim 1, wherein said means for altering the displacement volume comprise a two-speed valve (22), three-speed valve or a valve providing a higher number of motor speeds, arranged in the connection with said hydraulic motor (20). 3. An arrangement according to claim 1, wherein said means for altering the displacement volume of the hydraulic motor are integrated into said hydraulic motor (20). 4. An arrangement according to claim 1, further comprising two hydraulic pumps (23, 24) and electric motor drives arranged to rotate them, and four hydraulic radial piston motors (20) arranged so that their displacement volume can be altered, which motors are arranged to rotate a turning rim (10) arranged in said shaft means (8). 5. An arrangement according to claim 1, wherein control means for the hydraulic motor's (20) power input unit (23, 24) includes a frequency transformer. 6. An arrangement according to claim 1, wherein the adjustment of the turning speed of the shaft means (8) is arranged to be stepless. 7. A method for moving and steering a vessel traveling in water, in which method the vessel is moved using a propulsion unit (6), which comprises a chamber (5) positioned outside the vessel, equipment positioned inside the chamber for rotating a propeller (4) arranged in connection with said chamber, and a shaft means (8) connected to said chamber for supporting said chamber, in a rotatable manner, to the hull (9) of said vessel, the shaft unit (8) is turned, by at least one hydraulic motor (20), in relation to said hull (9) of said vessel for steering said vessel, wherein the turning speed of said shaft means (8) in relation to said hull (9) is altered by variably altering the displacement volume of said at least one hydraulic motor (20). 8. A method according to claim 7, wherein the displacement volume of said hydraulic motor (20) is altered by means of a two-speed valve (22), a three-speed valve, a four-speed valve or valve allowing for more speeds. 9. A method according to claim 7, wherein the displacement volume of the said hydraulic motor (20) is altered in a ratio of 2:3. 10. A method according to claim 7, wherein the turning speed of said shaft means (8) is controlled, in addition to controlling the displacement volume of said hydraulic motor (20), by controlling at least one of the electric input and volume flow rate of the pumps (25) of the hydraulic system (23, 24) which operates at least one of said hydraulic motors (20).