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A rudder mechanism for a marine vessel comprising of rudder that contains a first water flow surface essentially in planar form and an opposite second water flow surface essentially in planar form; a vertical rudder shaft that the rudder is linked by rotation around an axis that essentially extends

A rudder mechanism for a marine vessel comprising of rudder that contains a first water flow surface essentially in planar form and an opposite second water flow surface essentially in planar form; a vertical rudder shaft that the rudder is linked by rotation around an axis that essentially extends perpendicular to the water flow surfaces of said rudder; and a drive mechanism for rotating the rudder around said axis. The rudder mechanism contains a rudder slot comprising the vertical rudder shaft and extending from the top section of the rudder towards the bottom section, wherein the rotatable link of the rudder and the vertical rudder shaft is essentially located close to the bottom of said rudder slot and is essentially linked to the vertical rudder shaft of said drive mechanism in such manner to exert force in the radial direction.

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1. A rudder mechanism for a marine vessel comprising: a rudder (1) having an upper side, a lower side, a first water flow surface (2) having substantially planar form and an opposite second water flow surface (3) having substantially planar form;a vertical rudder shaft (7) rotatably communicating wi

1. A rudder mechanism for a marine vessel comprising: a rudder (1) having an upper side, a lower side, a first water flow surface (2) having substantially planar form and an opposite second water flow surface (3) having substantially planar form;a vertical rudder shaft (7) rotatably communicating with the rudder (1) about an axis that substantially extending perpendicular to the water flow surfaces of the rudder (1); anda drive mechanism for rotating the rudder (1) around the axis, the rudder mechanism further comprises a rudder slot (4) extending from the upper side of the rudder (1) towards the bottom side thereof for receiving the vertical rudder shaft (7);wherein the rotatable communication of the rudder (1) and the vertical rudder shaft (7) is provided substantially close to a rudder slot bottom (16) and the drive mechanism is communicated with the vertical rudder shaft (7) to exert force in the radial direction thereto. 2. A rudder mechanism according to claim 1, wherein the rudder slot bottom (16) is at a lower level than the center of the rudder (1) height with respect to the vertical length of the rudder (1). 3. A rudder mechanism according to claim 1, wherein the rudder (1) comprises a first rudder part (1.1) having a shell form, and a second rudder part (1.2) having a shell form and fixed to the first rudder part (1.1). 4. A rudder mechanism according to claim 3, wherein the first rudder part (1.1) is larger than the second rudder part (1.2) and has a different form and that the external surface of the first rudder part (1.1) covers one lateral surface of the rudder (1) completely and covers a certain portion of the other lateral surface of the rudder (1). 5. A rudder mechanism according to claim 4, wherein the first rudder part (1.1) comprises at least one support piece (13, 14) having an arcuate form, at least one support piece (13, 14) extending substantially in horizontal direction at its inner surface. 6. A rudder mechanism according to claim 5, wherein the vertical rudder shaft (7) comprises at least one radial shaft slot (15) supported by at least one support piece (13, 14). 7. A rudder mechanism according to claim 1, wherein the drive mechanism comprises a motor (17), a threaded motor shaft (18) communicating with the motor (17), and a slide (26) on the motor shaft (18), the slide (26) being linearly movable upon rotation of the shaft (18) and being communicated with the rudder shaft (7). 8. A rudder mechanism according to claim 7, wherein the slide (26) comprises oppositely provided slide pins (25) extending outwardly from sides thereof, and the vertical rudder shaft (7) comprises axial slide supporting cavities (24) oppositely formed for receiving the slide pins (25). 9. A rudder mechanism according to claim 8, wherein the vertical rudder shaft (7) comprises oppositely formed axial shaft inlet cavities (23) for insertion of the motor shaft (18) therethrough. 10. A rudder mechanism according to claim 4, further comprises a motor housing (22) formed at a spot close to the upper side of the first rudder part (1.1) for receiving the motor (17). 11. A rudder mechanism according to claim 1, wherein the drive mechanism is a hydraulic piston mechanism. 12. A marine vessel including the rudder mechanism of claim 1. 13. A rudder mechanism for a marine vessel comprising: a rudder comprising an upper side, a lower side, a first water flow surface having substantially planar form and an opposite second water flow surface having substantially planar form, said rudder further comprising a first lateral surface, a second lateral surface, a first rudder part having a first external surface and a first shell form, and a second rudder part having a second external surface and a second shell form fixed to the first rudder part, wherein the first rudder part is larger than the second rudder part, the first rudder part having a different form than the second rudder part, further wherein the first external surface completely covers the first lateral surface and a portion of the second lateral surface;a vertical rudder shaft rotatably communicating with the rudder about an axis that extends substantially perpendicular to the water flow surfaces of the rudder; anda drive mechanism for rotating the rudder around the axis, the rudder mechanism further comprises a rudder slot extending from the upper side of the rudder towards the bottom side thereof for receiving the vertical rudder shaft;wherein the rotatable communication of the rudder and the vertical rudder shaft is provided substantially close to a rudder slot bottom and the drive mechanism is communicated with the vertical rudder shaft to exert force in the radial direction thereto. 14. A rudder mechanism according to claim 13, further comprises a motor housing formed at a spot close to the upper side of the first rudder part for receiving the motor. 15. A rudder mechanism for a marine vessel comprising: a rudder having an upper side, a lower side, a first water flow surface having substantially planar form and an opposite second water flow surface having substantially planar form;a vertical rudder shaft rotatably communicating with the rudder about an axis that extends substantially perpendicular to the water flow surfaces of the rudder; anda drive mechanism for rotating the rudder around the axis, the rudder mechanism further comprises a rudder slot extending from the upper side of the rudder towards the bottom side thereof for receiving the vertical rudder shaft, said rudder slot having a shaft leaning surface and a shaft leaning edge;wherein the rotatable communication of the rudder and the vertical rudder shaft is provided substantially close to a rudder slot bottom and the drive mechanism is communicated with the vertical rudder shaft to exert force on the vertical rudder shaft in a radial direction positioning said vertical rudder shaft proximate to said shaft leaning surface in a first position and positioning said vertical rudder shaft proximate to said shaft leaning edge in a second position.