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US 6,599,159 B1Granted
Drive means a boat
OwnerBenny Hedlund, Kare Jonssoninventors
Life of this patent
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Abstract
A boat propeller drive with an underwater housing which is connected in a fixed manner to a boat hull and has tractor propellers which are arranged on that side of the housing facing ahead and the blade areas of which are adapted to one another in such a manner that, at least under certain operating conditions, the aft propeller works in a cavity-generating manner whereas the fore propeller works in a cavitation-free manner.
Claims12
Drive assembly in a boat, comprising:
- a propeller drive which is arranged in a fixed manner on the outside of a boat hull and has an at least essentially vertical shaft which, via an angle gear enclosed in an underwater housing, drives in a counter-rotating manner a pair of at least essentially horizontal propeller shafts each with their own propeller, and
- a drive unit which is arranged on the inside of the hull and to which the vertical shaft is drivably connected,
- wherein the propellers are tractor propellers, and
- wherein the blade areas of the propellers are adapted to one another in such a manner that, at least within a predetermined upper speed range, the aft propeller works in a cavity-generating manner and the fore propeller works in a cavitation-free manner.
1 more element
Dependencies are inferred from the claim text.