COMBINED PROPELLER CAP FOR REDUCING ROTATING FLOW AND HUB VORTEX AND ENHANCING PROPULSION EFFICIENCY

摘要

The present invention relates to a structure of a propeller cap. In order to solve the problem of a conventional propeller boss cap fin (PBCF) which requires precision processing and thus is difficult to manufacture and has high manufacturing costs, the present invention provides a combined propeller cap configured by combining a diffusion type propeller cap with the tip end of an existing contraction type propeller cap so that hub vortex cavitation occurring in the rear of a propeller can be reduced. In addition, provided is a combined propeller cap having a guide fin for reducing rotating flow and hub vortex and enhancing propulsion efficiency, the combined propeller cap being configured so as to be capable of additionally reducing occurrence of hub vortex cavitation due to attachment of a plate shaped guide fin to a contraction type portion of such a propeller cap or between a contraction type portion and a diffusion type portion thereof.