WATER-JET PROPELLER Russian patent published in 2015 - IPC B63H1/26 B63H11/08 

FIELD: transport.

SUBSTANCE: water-jet propeller comprises working wheel with cylindrical hub with constant or variable pitch blades with leading and trailing edges fitted in cylindrical adapter. Diameter of working wheel blades at inlet is larger than that at outlet to make frontal area is smaller than that at inlet by 1.5-2 times. Said case accommodates fixed blades of opposite direction relative to blade profile direction. Height of blades varies along the flow from minimum to maximum to make constant clearance with working wheel blades. Blades are smoothly curved to axial direction at outlet.

EFFECT: higher thrust and efficiency, better stability under cavitation.

2 dwg