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The flat part of an oar that is immersed in the water.

Related Terms

MUD FLAT

A tidal flat composed of mud.

CIRCULAR STEP BEARING

A flat circular hydrostatic bearing with a central circular recess.

ROTARY BLADE COMPRESSOR

Mechanism for pumping fluid by revolving blades inside cylindrical housing.

LEADING EDGE

Refers to the point where the steam enters the blade of an impulse turbine.

ICE CAKE

Any relatively flat piece of sea ice less than 20 meters across

REHEATING CYCLE

In the reheating cycle, superheated steam is expanded in a high-pressure turbine and then returned to the boiler's re-heater to raise the temperature of the steam to the inlet temperature, usually to around 537°C; it is then returned to the turbine to be expanded through intermediate-pressure turbines. In some cases, the steam is again returned for re-heating in the boiler and then expanded in the lower- pressure sections of the turbine. The main purpose of re-heating the steam on large turbo-generators is to avoid condensation in the lower-pressure sections of the turbine, which can rapidly cause blade erosion problems from wet steam.

FLEMISH

To coil a line that is not in use so that it lies flat on the deck.

FLIGHT DECK

The flat deck used for the launch and recovery of aircraft.

PROPELLER

An arrangement which consists of hub and number of blades mounted on a rigid shaft protruding from the hull of a vessel, usually driven by an inboard motor.

STEERING BOARD

A long, flat board or oar that went from the stern to well underwater, used to steer vessels before the invention of the rudder. Traditionally on the starboard side of a ship (the 'steering board' side).
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