Unit of propulsion by hydrodynamic reaction

Claim 1

A hydrodynamic-reaction propulsion unit comprising: A casing for attachment along the keel of a vessel, said casing including an upstream fluid inlet and a downstream fluid outlet nozzle; means to provide counterrotation within said casing and to eliminate cavitation therewithin comprising turbine rotor means in said casing between said inlet and outlet for generating fluid pressure in the casing to be emitted from said outlet nozzle, said turbine rotor means comprising two coaxial adjacent, counterrotating rotors, each said rotor carrying a plurality of blades, the blades of one rotor having a reversed helical pitch relative to the blades of the other rotor; power means operatively connected to said coaxial adjacent rotors for rotating each said rotor in an opposite direction to each other and about a longitudinal axis extending generally along the keel to which said casing is attached; means to regulate and maneuver operatively connected to said casing in relation to said outlet nozzle for controlling fluid pressure emission relative to the axis of said turbine rotor means comprising opposed sidewall portions of said outlet nozzle, said opposed sidewall portions comprising plates hinged intermediately of said sidewalls and including upstream and downstream portions positionable into or out of said outlet nozzle; and at least one internal baffle means downstream from said two coaxial adjacent turbine rotors, said internal baffle means extending longitudinally.