A flared out aft section of the side/bottom of the boat. The purpose is to prevent the hard chine of the boat catching a wake or small wave on a sharp turn.
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CENTRE OF BUOYANCYThe center of the area of the underwater transverse or longitudinal section of a hull at a particular trim, hence the point at which the force of buoyancy is regarded to be acting vertically upwards. |
PIVOTED WINDOW
A window having a section which is pivoted near the center so that the top of the section swings in and the bottom swings out.
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PISTON DISPLACEMENT
The volume which a piston in a cylinder displaces in a single stroke, equal to the distance the piston travels times the internal cross section of the cylinder.
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PHLEGER CORER
A device for obtaining ocean bottom cores up to about 4 feet (1.2 meters) in length; consists of an upper tube, main body weight, and tailfin assembly with a check valve that prevents the flow of water into the upper section and a consequent washing out of the core sample while hoisting the corer.
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PERMISSIVE BLOCK SYSTEM
A block system in which a railroad train is permitted to enter a block section already occupied by a train.
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NOZZLE THROAT AREA
The area of the minimum cross section of a nozzle. npin transistor
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NEUTRAL FIBER
A line of zero stress in cross section of a bent beam, separating the region of compressive stress from that of tensile stress.
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MOMENT DIAGRAM
A graph of the bending moment at a section of a beam versus the distance of the section along the beam.
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MODULUS OF RUPTURE IN BENDING
The maximum stress per unit area that a specimen inner portion of a section of wood.
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MICRO HEAT PIPE
A very small heat pipe that has a diameter between about 100 micrometers and 2 millimeters (0.004 and 0.08 inch) and a triangular cross section or other cross section with sharp corners, and that uses the sharp corner regions instead of a wick to return the working fluid from the condenser to the evaporator; it has potential applications in the electronics (cooling circuit chips), medical, space, and aircraft industries.
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