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A polar diagram, or polar plot, is a graph that shows a sailboat's potential speed over a range of wind speeds and relative wind angles. [1] It normally consists of the right side of a line chart with the radius representing the yacht speed and the angle representing the wind direction blowing from top to bottom. Several lines are normally ...
A navigator who needed to know the speed of the vessel had a sailor drop the log over the ship's stern. The log acted as a drogue , remaining roughly in place while the vessel moved away. The sailor let the log-line run out for a fixed time while counting the knots that passed over.
Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is exceeded, a vessel in displacement mode ...
The term originally referred to a book for recording readings from the chip log that was used to estimate a ship's speed through the water. [1] Today's ship's log has grown to contain many other types of information, and is a record of operational data relating to a ship or submarine , such as weather conditions, times of routine events and ...
2. (With oars) to push against the water with the oar in the opposite direction than normally used for moving the boat forward. This is used to slow the speed of the boat, or to move astern when manoeuvring. [3] back and fill A method of keeping a square-rigged vessel under control while drifting with the tide along a narrow channel.
A motorboat with an outboard motor. A motorboat or powerboat is a boat that is exclusively powered by an engine; faster examples may be called "speedboats".. Some motorboats are fitted with inboard engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox and the propeller in one portable unit.
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Before steam tugs became common, sailing vessels would back and fill their sails to maintain a good position in a tidal stream while drifting with the tide in or out of a river. In a modern yacht , motor-sailing – travelling under the power of both sails and engine – is a common method of making progress, if only in and out of harbour.