Propulsion system
AssigneeFuturetech Technologies Limited
InventorsIan James Duncan, Hugo Anthony Duncan
Life of this patent
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Abstract
A propulsion system for a water craft having at least one shaft extending rearwardly form the transom of the hull of the craft and a drive system for driving the at least one shaft. A surface piercing propeller is mounted on the at least one shaft, proximal to the trailing edge of the hull, so that the propeller operates in a transom cavity created behind the hull, in use of the craft. The ratio (S/C) of the spacing of the blades to the blade cord for each propeller is at least 2.0 along substantially the whole length of the blades. The propulsion system has a high operational efficiency particularly suited for high speed marine craft.
Claims38
A propulsion system for a water craft, the system comprising:
- at least one shaft which extends rearwardly from the transom of the hull of the water craft;
- a surface-piercing propeller mounted on said at least one shaft, proximal to a trailing edge of the hull, so that said propeller operated, in use, in a transom cavity created behind the transom of the hull;
- and
- drive means for driving said at least one shaft;
- wherein said propeller comprises a hub and a plurality of blades angularly spaced apart, substantially equidistantly, therearound, the ratio of the spacing of the blades to the blade chord being at least 2.0 along substantially the whole length of the blades, and
- wherein the end profile of the hull of the craft comprises at least one convex, generally arcuate profile projection which corresponds generally to the profile of the hub of the propeller.
A propulsion system for a water craft, the system comprising:
- at least one shaft which extends rearwardly from the transom of the hull of the water craft;
- a surface-piercing propeller mounted on said at least one shaft, proximal to a trailing edge of the hull, so that said propeller operates, in use, in a transom cavity created behind the transom of the hull;
- and
- drive means for driving said at least one shaft,
- wherein said propeller comprises a hub and a plurality of blades angularly spaced apart, substantially equidistantly, therearound,
- wherein the end profile of the bottom portion of the hull of the craft comprises at least one convex, generally arcuate profile projection which corresponds generally to the profile of the hub of the propeller and increases the area of water swept out by the propeller underwater thereby increasing the efficiency of the propeller.
Dependencies are inferred from the claim text.