COAXIAL PROPELLER (VERSIONS) Russian patent published in 2013 - IPC B64C11/48 

FIELD: transport.

SUBSTANCE: set of invention relates to devices intended for converting mechanical energy into fluid flow power. In compliance with first version, coaxial propeller consists of two screws of opposite rotational direction fitted on driven shafts. External screw has scimitar blades with their starting and end parts with different location angles at two hubs. One of the latter is equipped with end bearing of internal drive shaft extending through splines of third hub arranged between first two hubs. In compliance with first version, solid blades are fitted on third hub to run in internal space of external screw arched blades. In compliance with second version, semi-elliptical-profile central groove is made along external screw blade front side. In compliance with third version, external screw blades surrounding internal screw are jointed at medium part by flat spacer ring while their ends are jointed together by split lock ring.

EFFECT: improved design.

11 cl, 10 dwg