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By either hauling or easing the line, the tension in the luff can be changed, thereby shifting the point of maximum draft of the sail forward or aft respectively, optimizing sail shape and thus performance. It is a fine control which is used more frequently on racing sailboats than on cruising or day-sailing boats. [2]
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 ...
A bulb alone forces the water to flow up and over it forming a trough. Thus, if a bulb is added to a conventional bow at the proper position, the bulb trough coincides with the crest of the bow wave, and the two cancel out, reducing the vessel's wake. While inducing another wave stream saps energy from the ship, cancelling out the second wave ...
Edit 2 Original color scheme and dots, fixed captions in arial font and reduced pointer line thickness Reason Great picture with great encyclopedic value Proposed caption 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 ...
Waterline of a ship. The mark above the waterline indicates the Plimsoll line. The waterline is the line where the hull of a ship meets the surface of the water.. A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position.
As of 2005, kerosene and other fuel-based illumination methods consume an estimated 77 billion litres (20 billion US gallons) of fuel per year, equivalent to 8.0 million gigajoules (1.3 million barrels of oil equivalent) per day. [1] [2] This is comparable to annual U.S. jet-fuel consumption of 76 billion litres (20 billion US gallons) per year.
In small boats and yachts, this flat termination of the stern is typically above the waterline, but large commercial vessels often exhibit vertical transoms that dip slightly beneath the water. [2] On cruising boats, a counter stern may be truncated to form a "truncated counter stern", in which there is a part of the stern that approximates a ...
Merchant shipping companies (and particularly liner companies such as Cunard Line and ferries such as Red Funnel) were quick to recognise the publicity value of distinctive funnels, both in terms of shape, number of funnels, and the colours they were painted. In an era when ship hulls were uniformly painted black (to conceal inevitable dirt ...
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969 E Main St, Columbus, OH · Directions · (614) 257-0248