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Boat propeller drive unit with an underwater housing ( 5 ), which is solidly joined to a boat hull and has pulling propellers ( 15, 16 ) on the forward facing side of the housing. At the aft edge of the underwater housing, a rudder is mounted, comprising a first rudder blade ( 22 a ) mounted in th

Boat propeller drive unit with an underwater housing ( 5 ), which is solidly joined to a boat hull and has pulling propellers ( 15, 16 ) on the forward facing side of the housing. At the aft edge of the underwater housing, a rudder is mounted, comprising a first rudder blade ( 22 a ) mounted in the underwater housing and a second rudder blade ( 22 c ) mounted on the aft edge of the first rudder blade.

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1. Drive arrangement in a boat, comprising a propeller drive unit fixedly arranged to the outside of a boat hull, having an at least essentially vertical drive shaft, which, via an angle gearing enclosed in an underwater housing, drives at least an essentially horizontal propeller shaft with a tract

1. Drive arrangement in a boat, comprising a propeller drive unit fixedly arranged to the outside of a boat hull, having an at least essentially vertical drive shaft, which, via an angle gearing enclosed in an underwater housing, drives at least an essentially horizontal propeller shaft with a tractive propeller arranged on the forward facing side of the underwater housing, a rudder mounted in a wing-profile-like portion of the underwater housing for pivoting about a vertical axis aft of the propeller and a drive unit arranged inside the hull, with which the vertical drive shaft is drivably connected, characterized in that the rudder comprises a first rudder blade ( 22 a ), which is mounted in the underwater housing ( 5 ) for pivoting about a first vertical pivot axis (s′), and a second rudder blade ( 22 c ), which is mounted in an aft-facing edge of the first rudder blade for pivoting relative to the first rudder blade about a second vertical pivot axis (s″). 2. Drive arrangement according to claim 1, characterized in that control means ( 60 , 61 ) are arranged which, upon pivoting of the first rudder blade ( 22 a ) relative to the underwater housing ( 5 ), pivot the second-rudder blade ( 22 c ) relative to the first rudder blade. 3. Drive arrangement according to claim 2, characterized in that the control means ( 60 , 61 ) are arranged to pivot the second rudder blade an angle ( 13 ) which is dependent on the pivot angle (α) of the first rudder blade. 4. Drive arrangement according to claim 3, characterized in that the control means ( 60 , 61 ) are arranged to pivot the second rudder blade ( 22 c ) an angle ( 13 ) relative to the first rudder blade ( 22 a ), which is essentially equal to the pivot angle (α) of the first rudder blade relative to the underwater housing ( 5 ). 5. Drive arrangement according to claim 3, characterized in that the control means comprise transmission means ( 60 , 61 ) arranged between the second rudder blade ( 22 c ) and an element ( 7 ) separate from the first rudder blade. 6. Drive arrangement according to claim 5, characterized in that said transmission means comprise at least one steering arm ( 60 ) joined to the second rudder blade ( 22 c ), said steering arm engaging and being pivotable and longitudinally displaceable relative to a guide ( 61 ) separate from the first rudder blade. 7. Drive arrangement according to claim 1, characterized in that second rudder blade ( 22 c ) has a cross-sectionally convex forward edge ( 23 a ), which is lodged in a concave gutter ( 24 a ) in the aft-edge of the first rudder blade ( 22 a ). 8. Drive arrangement according to claim 1, characterized in that the second rudder blade ( 22 c ) has a steering surface, which amounts to between 30% and 40% of the steering surface of the first rudder blade ( 22 a ). 9. Drive arrangement according to claim 1, characterized in that the angle gearing ( 10 , 11 , 12 ) drives counter-rotationally a pair of concentric, at least essentially horizontal, propeller shafts ( 13 , 14 ) for individual propellers ( 15 , 16 ). 10. Drive arrangement according to claim 1, characterized in that the underwater housing ( 5 ) has a lower torpedo-like portion ( 20 ), which is joined to the lower edge of the wing-profile-like portion ( 21 ) and in which the propeller shaft(s) is(are) mounted. 11. Drive arrangement according to claim 10, characterized in that the length of the torpedo-like portion ( 20 ) is at least essentially equal to the sum of the lengths of the wing-profile-like portion ( 21 ) and the rudder blades ( 22 a , 22 c ). 12. Drive arrangement according to claim 11, characterized in that the torpedo-like portion ( 20 ) has, in its aft-facing end portion, an exhaust port ( 25 ) from an internal combustion engine driving said vertical shaft. 13. Drive arrangement according to claim 12, characterized in that the aft-facing portion of the torpedo-like portion ( 20 ) is shaped so that a screen ( 27 ) is formed between the second rudder blade ( 22 c ) and an exhaust port ( 25 ). 14. Drive arrangement according to claim 1, characterized in that the propeller(s) ( 15 , 16 ) are made with a hub ( 15 a , 16 a ), the largest diameter of which is less than the largest diameter of the torpedo-like portion ( 20 ). 15. Drive arrangement according to claim 14, characterized in that the largest propeller hub diameter is circa 20% of the propeller diameter. 16. Drive arrangement according to claim 1, characterized in that the wing-profile-like portion ( 21 ) of the underwater housing has means ( 7 ) for fixing the portion to the underside of the hull bottom. 17. Drive arrangement according to claim 1, characterized in that the underwater housing ( 5 ) is joined to a drive leg ( 32 ), which is fixable to a hull transom. 18. Drive arrangement according to claim 9 characterized in that the blade areas of the propellers are so adapted to each other that, at least under certain operating conditions, the aft-propeller ( 16 ) operates cavitatingly, while the forward propeller ( 15 ) operates non-cavitatingly. 19. Drive installation in a boat, comprising two laterally arranged drive arrangements according to claim 1, characterized in that the rudders are pivotable individually to provide rudder steering angles in opposite directions. 20. Drive arrangement in a boat, comprising a propeller drive unit fixedly arranged to the outside of a boat hull, having an at least essentially vertical drive shaft, which, via an angle gearing enclosed in an underwater housing, drives at least an essentially horizontal propeller shaft with a tractive propeller arranged on the forward facing side of the underwater housing, a rudder mounted in a wing-profile-like portion of the underwater housing for pivoting about a vertical axis aft of the propeller and a drive unit arranged inside the hull, with which the vertical drive shaft is drivably connected, wherein that the rudder comprises a first rudder blade, which is mounted in the underwater housing for pivoting about a first vertical pivot axis, and a second rudder blade, which is mounted in an aft-facing edge of the first rudder blade for pivoting relative to the first rudder blade about a second vertical pivot axis, wherein a sealing strip is arranged between the underwater housing and the first rudder blade and between the first rudder blade and the second rudder blade. 21. A drive arrangement in a boat, comprising:a propeller drive unit having an essentially vertical drive shaft, which drives an essentially horizontal propeller shaft with a tractive propeller arranged on the forward facing side of a housing;a rudder mounted in the housing for pivoting about a vertical axis aft of the propeller, said rudder comprising a first rudder blade that pivots about a first vertical pivot axis, and a second rudder blade, which is mounted in an aft-facing edge of the first rudder blade and pivots relative to the first rudder blade about a second vertical pivot axis; anda transmission arrangement which transmits a pivot movement of the first rudder blade relative to the housing to generate a pivot movement of the second rudder blade relative to the first rudder blade about the second pivot axis, said transmission arrangement comprising a steering arm having a forked end, said steering arm being connected to the second rudder blade at an end opposite said forked end, and a fixed vertical steering pin extending into said forked end, so that a certain steering angle of the first rudder blade creates a certain steering angle for the second rudder blade.