Water Screws (p1)

boat propeller boat propeller

above: Two large ship propellers found near some wharf on the north side of San Francisco, California, USA, 2002-09. Note the erosions on the edge of the blades, caused by air bubbles when it spins fast (called Cavitation↗).


boat propeller boat propeller

above: A propellers on exhibit in a northen wharf of San Francisco, California, USA, 2002-09.


boat propeller boat propeller

above: This boat propeller measures approx 116cm in diameter. (photo from a email contributor, 2004-09)

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Page created: 2003-05.
© 2003 by Xah Lee.
Xah Signet