Patent ID: 6500035
Filing Date: 2002-12-31
Classification: B63H

Abstract:
Water jet propulsion unit, comprising a jet tube, open at its upper inlet and lower outlet end, and accommodating therein a rotatingly driven propulsion means with in the outflow opening of the unit a rotatable grid of essentially mutually parallel guide plates crossing the axis of the propulsion means under an acute angle, in which the jet tube is, outside the inlet end, surrounded by a curved guide surface which has, in cross-section in a radial plane through the axis of the jet tube and starting from the wall of said tube an at least semicircular configuration, and ends at the outlet end in a guide chamber in which the end edges of two opposite walls, which bound the outflow opening of said chamber, cross the axis of the tube under an acute angle, said grid of plates being provided in said outflow opening with at least the end parts of the plates parallel to said end edges, the whole being rotatable, together with the grid, around the axis of the propulsion means.