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US 2003/0157849 A1Published application
Hull and propeller arrangement
AssigneeStormfageln Projekt AB
InventorTorbjorn Eriksson
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AssigneeStormfageln Projekt AB
InventorTorbjorn Eriksson
Estimating the term…
Hull and propeller arrangement for a surface watercraft (1), provided with at least one propeller (3), in addition to which the propeller (3), at high speeds of the watercraft, is surface-piercing, and the propeller (3) is arranged in such a manner that only the propeller blades (11) or parts thereof are submerged in the water at high speeds of the watercraft (1), in addition to which the hull (2) is provided with at least one streamlined projecting part (4) extends essentially in the longitudinal direction of the hull (2), the projecting part (4), in terms of its outer shape, has, at its aft end (6), an end edge (15) which, at least in part, extends essentially transversely to the longitudinal direction of the projecting part (4), the propeller (3) is locaded immediately astern of the end edge (15), and a part of the propeller, in the radial direction, extends beyond the delimiting surfaces of the projecting part (4). Each projecting part (4) is arranged in such a manner that, at high speeds of the watercraft (1), a bearing area (8) for the watercraft (1) is formed, which consists essentially of a part of the surface of the projecting part (4), which is situated immediately forward of the end edge (15) and on the very bottom of the projecting part (4).
Hull and propeller arrangement for a surface watercraft (1), provided with at least one propeller (3) which, at high speeds of the watercraft, is surface-piercing and is arranged in such a manner that only the propeller blades (11) or parts thereof are submerged in the water at high speeds of the watercraft (1), characterized in that the hull (2) is provided with at least one streamlined projecting part (4) which extends essentially in the longitudinal direction of the hull (2), in that the projecting part (4), in terms of its outer shape, has, at its aft end (6), an end edge (15) which, at least in part, extends essentially transversely to the longitudinal direction of the projecting part (4), in that the propeller (3) is located immediately astern of the end edge (15), in that a part of the propeller, in the radial direction, extends beyond the delimiting surfaces of the projecting part (4), and in that each projecting part (4) is arranged in such a manner that, at high speeds of the watercraft (1), a bearing area (8) for the watercraft (1) is formed, which consists essentially of a part of the surface of the projecting part (4), which is situated immediately forward of the end edge (15) and on the very bottom of the projecting part (4).
Hull and propeller arrangement according to any one of the preceding claims, characterized in that each propeller (3) is, in relation to the propeller blades (11), designed with a relatively large hub (9), in that the hub (9) has, at its periphery, a peripheral delimiting surface (10) which is essentially shaped like a cylinder, in that the hub (9) has an aft delimiting surface (12), and in that the junction between the aft delimiting surface (12) and the peripheral delimiting surface (10) is designed as a relatively sharp hub edge (13).
Hull and propeller arrangement according to any one of the preceding claims, characterized in that the watercraft (1) is provided with two propellers (3) located at a distance from one another in the transverse direction of the hull (2), and in that these are arranged in such a manner that, while the watercraft (1) is underway, the pitch angle of the propeller blades (11) can be adjusted individually for each propeller (3).
Hull and propeller arrangement according to any one of the preceding claims, characterized in that the leadthrough (18) of the drive shaft (17) through the hull (2) is located immediately next to the propeller hub (9).
Dependencies are inferred from the claim text.