WATER-JET PROPULSION SYSTEM Russian patent published in 2017 - IPC B63H1/00 B63H1/16 B63H5/14 

FIELD: transportation.

SUBSTANCE: water-jet propulsion system comprises a conduit, which is designed as a profiled annular axisymmetric nozzle, within which the impeller is coaxially mounted on the shaft taken. The impeller has a hub with fixed blades, and it is equipped with blades, attached to the ends of the annular shell. The conduit housing is formed by mating mentioned shell circular recess, in which the annular shell is placed movably and is flush with the inner surface of the conduit body. The form of straightened contour of the impeller blades in the area of the abutment of the blade to the shell ring, has a crescent thing towards flowing stream, whose radius of curvature is 4-5% of the rotor radius.

EFFECT: increase in acoustic and cavitation characteristics, while maintaining efficiency.

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