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The trip point of the valve mechanism, and therefore the cut-off, would be adjusted either manually or automatically by the governor. The valve is opened by the mechanical valve gear mechanism, and when the trip gear trigger releases the mechanism the valve is snapped closed, usually by a spring acting against a dashpot .
Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position, [1] and then machining a conical-section surface into the valve seat that will mate with a corresponding conical section of the ...
To miss stays is to fail in the attempt to go about; [4] if the vessel fails to go about, she is said to refuse stays. [3] In stays, or hove in stays, is the situation of a vessel when she is staying, or in the act of going about. [4] A vessel in bad trim, or lubberly-handled, is sure to be slack or loose in the stays: she may refuse stays ...
Period cutaway diagram of a triple-expansion steam engine installation, circa 1918. This particular diagram illustrates possible engine cutoff locations, after the Lusitania disaster and others made it clear that this was an important safety feature. A marine steam engine is a steam engine that is used to power a ship or boat.
Reconstruction of a 19th-century naval architect's office, Aberdeen Maritime Museum General Course of Study leading to Naval Architecture degree Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and operation ...
The middle rowers of a crew (numbers 2 and 3 in a four/quad, and 3, 4, 5 and 6 in an eight) are normally the most powerful and heaviest rowers, colloquially known as the Fuel Tank, Engine Room, Power House, Big Watts or Meat Wagon. [1] The boat pitches and yaws less in the middle, and the rowers there have less effect on these movements, being ...
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A tugboat, or tug, is a boat used to maneuver large ships in harbours, over the open sea, or through rivers and canals. They also tow barges , disabled ships, and oil rigs . Equipped with powerful engines producing thousands of horsepower, extensive rigging equipment, and a fender of tires for protection, tugboats can push or tow large vessels ...