Water vessel propulsion apparatus
AssigneeIdc, LLC
InventorFumio Nagata
Life of this patent
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Abstract
A water jet propulsion apparatus creates a high speed water jet rearwardly through a duct in a hull by injecting air and water into the duct from at least one injection port, thereby to impart a thrust to the hull. The need of forming protrusions such as an impeller within the duct thus is eliminated, and the resistance loss of the jet is minimized. Propulsion efficiency is improved remarkably and noise is reduced, while at the same time course stability is improved.
Claims26
In a water vessel hull having a propulsion apparatus for propelling said hull through the water, the improvement wherein said propulsion apparatus comprises:
- a duct connected to said hull and depending therefrom at a position to be beneath the water surface, said duct having extending entirely therethrough a rectilinear passage having an inlet and an outlet both to be open to the water;
- at least one injection port extending into said passage at a position between said inlet and outlet thereof, said at least one injection port being directed toward said outlet;
- a pressurized water port opening into said injection port in a direction toward said outlet;
- a compressed air port surrounding said pressurized water port and opening into said injection port in a direction toward said outlet;
- and
- said pressurized water port and said compressed air port being connected respectively to pressurized water and compressed air sources in said hull, thereby to inject through said injection port into said passage a water jet and a surrounding air jet directed toward said outlet.
A propulsion apparatus for propelling a water vessel hull through water, said propulsion apparatus comprising:
- a duct to be connected to the hull to depend therefrom at a position to be beneath the water surface, said duct having extending entirely therethrough a rectilinear passage having an inlet and an outlet both to be open to the water;
- at least one injection port extending into said passage at a position between said inlet and outlet thereof, said at least one injection port being directed toward said outlet;
- a pressurized water port opening into said injection port in a direction toward said outlet;
- a compressed air port surrounding said pressurized water port and opening into said injection port in a direction toward said outlet;
- and
- said pressurized water port and said compressed air port being connected to respective connections through said duct to enable the respective supply thereto of pressurized water and compressed air, thereby to enable the injection through said injection port into said passage of a water jet and a surrounding air jet directed toward said outlet.
Dependencies are inferred from the claim text.