The flat part of an oar that is immersed in the water.
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MUD FLAT
A tidal flat composed of mud.
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CIRCULAR STEP BEARING
A flat circular hydrostatic bearing with a central circular recess.
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ROTARY BLADE COMPRESSOR
Mechanism for pumping fluid by revolving blades inside cylindrical housing.
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LEADING EDGE
Refers to the point where the steam enters the blade of an impulse turbine.
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ICE CAKE
Any relatively flat piece of sea ice less than 20 meters across
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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.
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FLEMISH
To coil a line that is not in use so that it lies flat on the deck.
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FLIGHT DECK
The flat deck used for the launch and recovery of aircraft.
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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.
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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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