Fluid reaction surfaces (i.e. – impellers) – Plural impellers having relative movement or independent... – Shiftable support
Patent
1981-06-03
1983-05-03
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Plural impellers having relative movement or independent...
Shiftable support
416133, 416189, B63H 116, B63H 508
Patent
active
043819010
ABSTRACT:
A marine propeller system comprising three individual elements, two of which are propellers mounted on a common shaft driven by a prime mover and the third being a cylindrical tube surrounding and movable relative to the two propellers, the tube having its interior surface in the form of a pair of equal and opposing truncated cones meeting midway of the ends of the tube. The rearward propeller is conventionally keyed to the driven shaft and fast thereon and the forward propeller is axially movable on the shaft and is arranged to be driven by the rearward propeller whereby, depending upon hydraulic pressures within the cylinder, the forward or driven propeller is shiftable relative to the rearward or driving propeller to maintain a spiral discharge from the cylinder with annular wake influence lines and substantially free of cavitation regardless of vessel load or speed.
REFERENCES:
patent: 1612696 (1926-12-01), Beres
patent: 1688808 (1928-10-01), Gill
patent: 1788307 (1931-01-01), Lack
patent: 2133853 (1938-10-01), Feige
patent: 2192469 (1940-03-01), Green
patent: 3023813 (1962-03-01), Fengler
patent: 3209156 (1965-09-01), Struble
patent: 3549271 (1970-12-01), Kuboya
patent: 3806278 (1974-04-01), Grennan
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