Water Screws, page 2

By Xah Lee. Date:
boat propeller
Propeller for a small boat. (Source) The scars on the blade are Cavitation damage.
Schraube Europa 04
MS Europa (Build in 1938).
Schraube U Boot
Submarine from World War 1.

Above photos are taken in the Villa Hügel, Essen, Germany, ~2004, contributed by Volker Peters.

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