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Photographer's Note

the propeller of a wooden boat on the dry at içmeler seaside.

propeller:

A propeller is the most common propulsor on ships, imparting momentum to a fluid which causes a force to act on the ship.

The ideal efficiency of any size propeller is that of an actuator disc in an ideal fluid. An actual marine propeller is made up of sections of helicoidal surfaces which act together 'screwing' through the water (hence the common reference to marine propellers as "screws"). Three, four, or five blades are most common in marine propellers, although designs which are intended to operate at reduced noise will have more blades. The blades are attached to a boss (hub), which should be as small as the needs of strength allow - with fixed pitch propellers the blades and boss are usually a single casting.

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Additional Photos by efser unsal (efi) Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 280 W: 46 N: 509] (5303)
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