Rudder and fittings in dry dock

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From: kpbosun views 32767
Filename: M Gulf rudder+ lg.jpg

This is the stern of a C-3 class vessel. The "wheel" has been removed for replacement. The "boss" where the shaft passes through is just visible on the left. The Third Engineer is standing next to the "skeg" which positions the lower end of the rudder. A close look will reveal that upper and lower parts of the rudder have slightly different angles. This is because the blades of the "wheel" are going in opposite directions as they pass it top and bottom. This compensates for the difference in the water flow at each position.
As I recall, the "pitch" of the blades was 19 feet 6 inches per revolution, and at sea it turned at a bit over 70 RPM. Typical speed was a bit over 16.5 knots.

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