FIELD: fans and axial-flow pumps; flying vehicles, sea-going and river ships.
SUBSTANCE: propeller with Laval nozzles has hub with blades radially secured to it. Laval nozzles are made in each blade in the immediate vicinity of hub; all inlet orifices of Laval nozzles are made on front end surfaces of blades.
EFFECT: enhanced efficiency of propeller.
3 dwg
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