Propulsion device and ship using the same
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United States of America Patent
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May 5, 2015
Grant Date -
Apr 25, 2013
app pub date -
Oct 7, 2011
filing date -
Oct 19, 2010
priority date (Note) -
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Abstract
A propulsion device of the ship includes a port side screw propeller; and a starboard side screw propeller provided in a forward or backward direction in a longitudinal direction of the ship from the port side screw propeller, such that a part of propeller wings of the starboard side screw propeller overlaps with propeller wings of the port side screw propeller. One of the port side screw propeller and the starboard side screw propeller, which is on a forward side in a longitudinal direction of the ship, is the forward screw propeller, and the other is the backward screw propeller. The forward screw propeller has a wing shape by which tip vortex cavitation is more difficult to be generated by the forward screw propeller than the backward screw propeller.
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