Fluid reaction surfaces (i.e. – impellers) – Radially extensible or retractible rotor working member – Having pitch adjustment
Patent
1987-11-03
1989-01-31
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Radially extensible or retractible rotor working member
Having pitch adjustment
416142, 416202, 416238, B63H 122
Patent
active
048012432
ABSTRACT:
An adjustable diameter screw propeller includes a hub having a plurality of spindles, each mounted in the hub for rotation about an axis disposed radially of the hub axis and a mechanism for synchronously turning the spindles in a common direction. A plurality of propeller blades having a fixed pitch contour and a skew in the range of 60.degree. to 90.degree. are attached to respective ones of the spindles, such that as the spindles are turned, the blades rotate between a first disposition in which the diameter of the propeller is maximum and a second disposition in which the diameter of the propeller is reduced. In addition, the pitch of the propeller increases as the propeller diameter decreases to compensate for the loss of power that would otherwise occur as the propeller diameter is decreased.
REFERENCES:
patent: D141235 (1945-05-01), Birsh
patent: 938291 (1909-10-01), Thompson
patent: 993126 (1911-05-01), Thompson
patent: 997884 (1911-07-01), Wells
patent: 1947560 (1934-02-01), Manasek
patent: 2012987 (1935-09-01), Chillingworth
patent: 2134660 (1938-10-01), Everts
patent: 2374833 (1945-05-01), Rippingille
patent: 2481751 (1949-09-01), James
patent: 2528609 (1950-11-01), Rouse
patent: 3226031 (1965-12-01), Holland
patent: 3565544 (1971-02-01), Marshall
patent: 3589647 (1971-06-01), Burkham
patent: 4364711 (1982-12-01), Brandt et al.
patent: 4427341 (1984-01-01), Eichler
patent: 4565531 (1986-01-01), Kimon
"Propeller's Pitch, Diameter Adjust Automatically", by David J. Bak, East Coast Editor, taken from Design News, 1-21-85.
Bird-Johnson Company
Powell Jr. Everette A.
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