Manoeuvring device for boats

In a manoeuvring device for a boat and the like having a propulsion means (14) for developing a rearwardly directing stream of water for a reactive forward driving of the boat and the like, a pair of vertically elongate, transversely arced, pivotal tube plates (17, 18), one mounted to each side of the propulsion means and in the normal operating position thereof forming a tube around the propulsion means, said tube plates being mounted for swinging movement to bring the tube plates together along adjoining edges astern of and spaced from the propulsion means to form a blade for interrupting and diverting the rearwardly directed stream of water, the improvement wherein the tube plates extend downward below the propulsion means, and a tube wing (20) positioned transversely between the tube plates immediately under the propulsion means, said tube wing extending in the longitudinal direction and being transversely arced upward toward the propulsion means, said tube wing delimiting a passageway (19B), below and separate from the propulsion means and the rearwardly directed stream of water, for receiving and forwardly directing the diverted stream of water.