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Tugboat diesel engines typically produce 500 to 2,500 kW (~ 680 to 3,400 hp), but larger boats (used in deep waters) can have power ratings up to 20,000 kW (~ 27,200 hp) [citation needed]. Tugboats usually have an extreme power : tonnage -ratio; normal cargo and passenger ships have a P:T-ratio (in kW: GRT ) of 0.35 to 1.20, whereas large tugs ...
In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines.
A bearing is the angle between the line joining the two points of interest and the line from one of the points to the north, such as a ship's course or a compass reading to a landmark. On nautical charts, the top of the chart is always true north , rather than magnetic north , towards which a compass points.
The USCG 65' small harbor tug is a class of fifteen tugs used by the United States Coast Guard for search and rescue, law enforcement, aids-to-navigation work and light icebreaking. The tugs are capable of breaking 18 in (0.46 m) of ice with propulsion ahead and 21 in (0.53 m) of ice backing and ramming. [ 2 ]
The first 30 boats were powered by two 600 horsepower (450 kW) Cummins diesel engines, except for 82314 (later Point Thatcher), which was powered by two 1,000 horsepower (750 kW) gas turbine engines with controllable pitch propellers [5] and 82318 (later Point Herron) which had two 800 horsepower (600 kW) Cummins diesels installed.
The Santa Cruz Small Craft Harbor (also "Santa Cruz Harbor", but see below) is situated in Santa Cruz, California, on the site of the former Woods Lagoon. Built in 1962–1963, its public use specializes in boating and extracurricular marine activities for the local community and visitors. [ 1 ]