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A knot is a unit of speed abbreviated kt or kn. It is a non-SI unit accepted for use with the SI.[1] It is used around the world for maritime and aviation purposes. Cover of brochure The International System of Units. ...
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Aviation refers to flying using aircraft, machines designed by humans for atmospheric flight. ...
Definition 1 international knot = 1 nautical mile per hour = 1.852 kilometre per hour exactly. This is based on the internationally agreed length of the nautical mile, as adopted by the US in 1954 (which previously used the US nautical mile of 1852.249 m), the UK in 1970 (which previously used the UK or Admiralty nautical mile of 1853.184 m) and other countries. This is the definition used in most, if not all, modern circumstances. Knot is sometimes mistakenly used to refer to the nautical mile itself, but this is incorrect. A nautical mile or sea mile is a unit of length. ...
The hour (symbol: h) is a unit of time. ...
Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). ...
The speed of a vessel relative to the fluid in which it travels is usually measured in knots. This may be referred to as 'boat speed', 'vessel speed' and, for aircraft, 'air speed'. For consistency in navigation, the speeds of relevant fluids, such as tidal streams, river currents and wind speeds, are also usually specified in knots. Knots are then also used to describe the actual speed of a vessel over the ground (SOG) and for its rate of progress toward a distant point ('velocity made good' or VMG). Airspeed is the speed of an aircraft relative to the air. ...
A tidal atlas or a tidal stream atlas is used to predict the direction and speed of tidal currents. ...
This bridge across the Danube River links Hungary with Slovakia. ...
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Ground speed is the speed of an aircraft compared to the ground without factoring in the wind or other weather conditions. ...
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Conversions 1 (international) knot is exactly equal to 1.852 kilometres per hour (km·h−1), and is approximately equal to the following: Kilometres per hour (American spelling: kilometers per hour) is a unit of both speed (scalar) and velocity (vector). ...
A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ...
Feet per second is a unit of speed; it expressses the number of feet traveled in one second. ...
Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ...
A mile is a unit of length, usually used to measure distance, in a number of different systems, including Imperial units, United States customary units and Norwegian/Swedish mil. ...
Miles per hour is a unit of speed, expressing the number of international miles covered per hour. ...
Origin In some sailing ships, speed was measured by casting the chip log from the stern. The log was relatively immobile, and attached by line to a reel. Some sources suggest that knots placed at a distance of 47 feet 3 inches (14.4018 m) passed through a sailor's fingers, while another used a 28 second sandglass to time the operation.[citation needed] The knot count would be reported and used in the sailing master's dead reckoning and navigation. This method gives a value for the knot of 20.25 in/s, or 1.85166 km·h−1. The difference from the accepted value today is a bit less than 0.02%. A chip log is a navigational tool used by mariners to determine speed through the water. ...
A log is a device used in navigation to measure the speed of a ship. ...
Some knots: 1. ...
A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, ′ – a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ...
An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ...
Hourglass An hourglass, also known as a sandglass or sand timer, is a device for the measurement of time. ...
Dead reckoning (DR) is the process of estimating ones current position based upon a previously determined position, or fix, and advancing that position based upon measured velocity, time, heading, as well as the effect of currents or wind. ...
Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. ...
Discussion Because a knot is defined as a nautical mile per hour, the expression "knots per hour" is considered incorrect as a unit of speed, since this suggests 'nautical mile per hour per hour', which would be a measure of acceleration. Acceleration is the time rate of change of velocity, and at any point on a velocity-time graph, it is given by the slope of the tangent to that point basicly. ...
Although knots do not fit within the primary SI system, their retention for nautical and aviation use is important for navigational reasons, since the length of a nautical mile is almost identical to a minute of latitude. As a result, distance in nautical miles on a navigational chart can easily be measured by using dividers and the latitude indicators on the side of the chart. Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator. ...
Nautical examples Displacement hulls (for example those not planing on the surface of the water) have a maximum speed beyond which they tend to 'dig in', with their bows high and sterns low, and become increasingly wasteful of propulsive power. This is known as their hull speed and it depends mainly upon waterline length. For various displacement boat hulls the following table relates waterline lengths to hull speeds and so gives some examples of usage of the unit knots. A displacement hull is the type of hull used by large ocean-going vessels and sailboats. ...
A Musto Skiff, planing on a fast reach A planing boats hull skims across the surface of the water rather than pushing through the water in the way a traditional displacement hull works. ...
The hull speed is the maximum speed that a displacement hull can achieve. ...
Hull speeds | Waterline length (ft) | Waterline length (m) | Hull speed (knots) | Type of Boat | | 10 | 3.0 | 4.4 | Dinghy | | 18 | 5.5 | 5.9 | Small fishing or pleasure boat | | 28 | 8.5 | 7.3 | Small yacht | | 36 | 11.0 | 8.2 | Family yacht | | 50 | 15 | 9.8 | Small commercial fishing boat or ferry | | 200 | 61 | 20 | Small commercial ship | | 400 | 122 | 28 | Typical cruise or container ship |
Aeronautical terms In some circumstances relatively small discrepancies in measured and actual airspeeds can be significant. True airspeed (TAS) is the speed of an aircraft relative to the airmass in which it flies, i. ...
Aircraft display an Indicated Airspeed (abbreviated IAS) on an instrument called an airspeed indicator. ...
Airspeed Indicator The airspeed indicator is an instrument used in an aircraft to display the crafts airspeed, typically in knots, to the pilot. ...
Calibrated airspeed (CAS) is indicated airspeed, corrected for instrument error and position error. ...
This article belongs in one or more categories. ...
Equivalent airspeed (EAS) is the airspeed which represents the same dynamic pressure at altitude that would be generated by flying at the corresponding true airspeed (TAS) at sea level. ...
A compressible flow is a situation in which the compressibility of a fluid must be taken into account. ...
External links - Non-SI units accepted for use with the SI, and units based on fundamental constants - At one time, the knot, along with the nautical mile, was discouraged for use by the BIPM, but it is now officially accepted for use (as of the 8th edition of the SI brochure), since its use is "expected to continue indefinitely", as well as having an exact SI definition.
- OnlineConversion.com: What is a knot? What is a nautical mile?
See also ==References==4sex rub it Image File history File links No higher resolution available. ...
Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ...
To help compare different orders of magnitude, the following list describes various speed levels between 1. ...
- ^ Non-SI units accepted for use with the SI
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