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US 8,215,255 B2Granted
Ship rudder and ship provided therewith
AssigneeAloys Wobben
InventorsAloys Wobben, Rolf Rohden, Dirk Holtkamp
Life of this patent
Estimating the term…
Abstract
A twisted rudder blade for a ship having a twist that is adapted to the configuration of the flow of the water in the region of the rudder blade if no propeller in operation is disposed in front of the rudder blades in the direction of travel of the ship.
Claims7
A ship comprising:
- a hull having a stern portion with sides that converge toward a keel line of the ship;
- and
- a pair of twisted rudder blades arranged for steering the ship, the rudder blades coupled to the stern portion of the ship with one twisted rudder blade positioned on each side of the keel line, and each twisted rudder blade having a twist that varies over a height thereof to align with a converging flow of water in a region of the twisted rudder blade generated by a geometry of the sides of the ship when the ship travels through the water in a forward direction, an angle of the twist of each blade varying progressively in the same direction between an upper end of the rudder blade near the hull and a lower end of the rudder blade remote from the hull, and in which a chord line of a cross-sectional profile of each of the twisted rudder blades at any height is directed from a leading edge of the rudder blade to a trailing edge of the rudder blade in a direction toward the keel line of the ship.
A ship comprising:
- a hull having a stern portion with sides that converge toward a keel line of the ship;
- and
- two twisted rudder blades, each rudder blade positioned at the stern portion of the ship offset from the keel line and having a twist that varies progressively in the same direction over a height thereof between a region of the rudder blade near the hull and a region of the rudder blade remote from the hull, and an angle of incidence of each rudder blade relative to the keel line defined by a chord line of the rudder blade at a respective height being between 10 degrees and 20 degrees in the region near the hull of the ship and between 2 degrees and 5 degrees in the region remote from the hull of the ship such that each rudder blade twists at least 5 degrees and less than 18 degrees over the height thereof, and the chord line of the rudder blade at any height being directed from a leading edge of the rudder blade to a trailing edge of the rudder blade in a direction toward the keel line.
Dependencies are inferred from the claim text.