The sea is the unit of the length of the sea. It originally refers to the length of latitude 1 min on the meridian of the earth. Because the earth is slightly ellipsoid, the radian of 1 min at different latitudes is slightly different. On the equator, 1 nautical mile is approximately equal to1843m; The latitude of 45 is about 1852.2m, and the pole is about 1 86 1 .6m ..1929 International Hydrogeology Conference, with the average length of1min and1852m as/kl. 1948 International Life Safety Conference recognized that 1 852m or 6o76.10/5ft is1nautical mile, so1852m is adopted as the standard nautical mile length internationally. China recognizes this standard, which is indicated by the code name "M".
In addition, the unit of marked length is also used for the manufacture and use of anchor chain links on ships. Generally, the length of 27.5m anchor chain is 1 knot. The use symbol of China warship is 1 knot, 20 meters.
As early as16th century, the navigation industry was quite developed. But there was no clock and no voyage recorder at that time, so it was difficult to accurately determine the sailing speed of the ship. At this time, a clever sailor came up with a wonderful method. When the ship is sailing, he throws a rope tied with a floating body to the sea, divides the rope into several sections by knotting, and calculates the speed of the ship according to the number of sections pulled out at a certain moment, so the "section" becomes the unit of measurement for the speed of the ship sailing at sea. Correspondingly, the speed of underwater weapons such as seawater, offshore wind speed and torpedo is also expressed in knots.
However, this calculation method of knot speed is of course inaccurate. With the development of science and technology, the speed measuring instruments of modern ships are very advanced, and the speed can be directly displayed by numbers. "Towing rope node" has long been history, but "node" is still used as a unit to measure various speeds at sea. Modern and accurate "knots" refer to driving every hour 1 nautical mile (1 nautical mile =1852m).
I found it online, hehe ~ ~ ~
Edited on April 20, 2009
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Why is the ship speed expressed in knots instead of kilometers?
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Why is the speed of warships expressed in knots? How much is a knot?
1 knot/hour
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Why is the ship speed expressed in knots? Not kilometers?
Isn't yi in the sea? anxious ..
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Why is the sailing speed expressed in knots? Not at kilometers per hour? How many kilometers per hour is a section equal to?
Knot is an ancient naval unit, because there was no speedometer in the maritime era. The speed of a ship is calculated by knotted rope, that is, many knots are tied on a long rope at equal intervals, and then one end is thrown into the sea. At this time, as the ship sails, it will naturally pull the rope longer and longer. Then after a certain period of time (for example, an hour), calculate how many knots are lost and how many knots are thrown into the sea. At that time, this unit was gradually accepted by commercial navigation all over the world, because navigation was not divided between military and civilian (for example, anyone with ability could get a private license). In modern times, the code name of "festival" is the prefix of "Knot" in English, which is represented by "Kn". 1 knot is equal to 1 nautical mile per hour, that is to say, driving 1.852 kilometers (kilometers) per hour. In navigation, the unit for measuring short distances is "chain", and the chain of 1 is equal to110 nautical mile. The code is the prefix of English "Cable", with "Cab". The navy is a very old and conservative (or conservative) unit, and many customs have not changed for hundreds of years (including very red tape naval etiquette). The same is true for civil offshore operations.
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How many knots does the ship speed often say? What does knot mean? Why not use the festival in the sea?
The code name of "Knot" is the prefix of English "Knot" and is represented by "Kn". 1 knot is equal to 1 nautical mile per hour, that is to say, driving 1.852 kilometers (kilometers) per hour. In navigation, the unit for measuring short distances is "chain", and the chain of 1 is equal to110 nautical mile. The code is the prefix of English "Cable", with "Cab". The sea is the unit of the length of the sea. It originally refers to the length of latitude 1 minute on the meridian of the earth. Because the earth is slightly ellipsoid, the radian of 1 min at different latitudes is slightly different. On the equator, 1 nautical mile is approximately equal to1843m; The latitude of 45 is about 1852.2m, and the pole is about 1 86 1 .6m ..1929 International Hydrogeology Conference, with the average length of1min and1852m as/kl. 1948 International Life Safety Conference recognized that 1852m or 6076. 1 5ft was1nautical mile, so 1852m was adopted as the standard nautical mile length internationally. China recognizes this standard, which is indicated by the code name "M". In addition, the marked length unit of anchor chain links manufactured and used on ships also uses "links". Generally, the length of 27.5m anchor chain is 1 knot; The use mark of China ships is 20m, 1 knot.
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Why is the speed of naval vessels expressed in knots? How big is the festival? And what does endurance mean?
The distance at sea is calculated in nautical miles, 1 knot = 1 nautical mile/hour, 1 nautical mile =1.852km.. The endurance of a ship refers to the maximum distance that a ship can reach under the condition of full combustion, mechanical water and lubricating oil at a given speed. Measuring in nautical miles is one of the tactical and technical performance elements of warships. The endurance at different speeds is different, and the endurance at economic speed is the largest. Nuclear-powered ships have large nuclear fuel energy, which is the main limitation of endurance.