Adjustable diameter screw propeller
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United States of America Patent
Stats
-
Jan 31, 1989
Issued Date -
N/A
app pub date -
Nov 3, 1987
filing date -
Dec 28, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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