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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 ...
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True wind (V T) is the same everywhere in the diagram, whereas boat velocity (V B) and apparent wind (V A) vary with point of sail. Forces on sails result from movement of air that interacts with sails and gives them motive power for sailing craft, including sailing ships , sailboats , windsurfers , ice boats , and sail-powered land vehicles .
Cross-sectional diagram of a trireme, showing the positions of the rowers in one file The quinquereme was a galley , c. 45 metres (150 ft) long, c. 5 metres (16 ft) wide at water level, with its deck standing c. 3 metres (10 ft) above the sea, and displacing around 100 tonnes (110 short tons ; 100 long tons ).
On the smallest surface vessels, such as a sport fishing boat, the flying bridge may have controls permitting the ship to be piloted from the flying bridge, but will lack the full range of controls of the pilot house. On larger small vessels, the flying bridge may actually be enclosed, in which case it is more properly called an "upper pilot ...
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Small outboard motors, up to 15 horsepower (11 kW) or so, are easily portable. They are affixed to the boat via clamps and thus easily moved from boat to boat. These motors typically use a manual start system, with throttle and gearshift controls mounted on the body of the motor, and a tiller for steering. The smallest of these weigh as little ...
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