Convert Feet Per Second to Knots (fps to kt) ▶
How to convert
1 knot (kt) = 1.687809858 foot per second (fps). Knot (kt) is a unit of Speed used in Standard system. Foot Per Second (fps) is a unit of Speed used in Standard system.
Definition of Knots
Knots, commonly denoted kn, is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s). It is the standard unit of speed used in meteorology, and in maritime and air navigation. A vessel travelling at 1 kn along a meridian travels approximately one minute of geographic latitude in one hour.
How to Convert Knots
To convert knots to other units of speed, we need to multiply or divide by the corresponding conversion factors. For example, to convert knots to kilometers per hour, we need to multiply by 1.852, since there are 1.852 kilometers in one nautical mile. To convert knots to meters per second, we need to divide by 3.6, since there are 3.6 seconds in one hour.
Here are some examples of how to convert knots to other units of length in the US Standard system and the SI system:
Where Knots Are Used
Knots are used in various fields of science and technology where the speed and direction of movement of objects or phenomena are measured or applied in relation to water or air currents. For example:
History of Knots
The origin of knots as a unit of speed can be traced back to the ancient practice of measuring the speed of ships by using a device called a chip log or log-line. This device consisted of a wooden board attached to a rope with knots tied at regular intervals along its length. The board was thrown overboard from the stern of the ship and allowed to drag behind it while the rope was let out for a fixed amount of time (usually measured by a sandglass). The number of knots that passed over the rail of the ship during that time indicated the speed of the ship in nautical miles per hour.
The first recorded use of this method was by the Phoenicians around the second millennium BCE. The device was later improved and standardized by various civilizations such as the Greeks, Romans, Arabs, Vikings, Chinese, and Europeans. The length of the nautical mile and the spacing of the knots varied from place to place and from time to time until they were fixed by international agreement in the late nineteenth century.
The term knot was derived from the Old English word cnotta meaning “a knot”. It was first used as a unit of speed by English sailors in the early seventeenth century.
Example Conversions of Knots to Other Units
Here are some examples of how to convert knots to other units of speed, using the conversion factors given above:
Feet per second: A unit of speed
Feet per second (ft/s) is a unit of speed or velocity in the US customary and imperial systems. It measures how fast an object is moving by calculating the distance traveled in feet divided by the time taken in seconds. For example, if a person walks 10 feet in 2 seconds, their speed is 5 ft/s.
How to convert feet per second
Feet per second can be converted to other units of speed or velocity by using simple conversion factors. Here are some common units and their conversion factors:
Where feet per second are used
Feet per second are mainly used in engineering and aviation to measure the speed or velocity of machines and aircrafts.
For example, the speed of sound in air at sea level is about 343 m/s or about 1125 ft/s.
The maximum speed of a Boeing 747 jet airliner is about 988 km/h or about 2717 ft/s.
The average speed of a bullet fired from a handgun is about 1200 ft/s.
Definition of feet per second
According to the US customary and imperial systems definition, one foot per second is the speed of a body that covers a distance of one foot in a time of one second.
Mathematically, it can be expressed as:
where v is the speed or velocity in feet per second, s is the distance traveled in feet, and t is the time taken in seconds.
History of feet per second
The concept of speed or velocity has been studied since ancient times by philosophers and scientists such as Aristotle, Galileo, Newton, etc.
The foot was originally derived from the Roman foot which was defined as one third of a yard or about 11.65 inches.
The second was originally defined in terms of the Earth’s rotation as one eighty-six thousand four hundredth of a mean solar day.
The combination of these two units resulted in the foot per second as a unit of speed or velocity.
The foot per second was officially adopted as part of the US customary and imperial systems in the late 18th century.
Example conversions of feet per second to other units
Here are some examples of converting feet per second to other units of speed or velocity:
1 ft/s = 0.3048 m/s = 1.09728 km/h = 0.681818 mph = 0.592484 kn = 12 in/s = 0.000189394 mi/s
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Knots to Feet Per Second
Knots to Kilometers Per Day
Knots to Kilometers Per Hour
Knots to Light Speed
Knots to Mach
Knots to Miles Per Day
Knots to Miles Per Minute
Knots to Miles Per Second
Knots to Miles Per Hour
Knots to Meters Per Second
Feet Per Second to Centimeters Per Second
Feet Per Second to Knots
Feet Per Second to Kilometers Per Hour
Feet Per Second to Mach
Feet Per Second to Miles Per Minute
Feet Per Second to Miles Per Second
Feet Per Second to Miles Per Hour
Feet Per Second to Meters Per Second
Kilometers Per Second to Kilometers Per Hour
Knots to Kilometers Per Hour
Knots to Miles Per Hour
Kilometers Per Hour to Kilometers Per Second
Kilometers Per Hour to Knots
Kilometers Per Hour to Light Speed
Kilometers Per Hour to Mach
Kilometers Per Hour to Miles Per Second
Kilometers Per Hour to Miles Per Hour
Kilometers Per Hour to Meters Per Second
Light Speed to Kilometers Per Hour
Light Speed to Miles Per Hour
Mach to Kilometers Per Hour
Mach to Miles Per Second
Mach to Miles Per Hour
Miles Per Second to Kilometers Per Hour
Miles Per Second to Mach
Miles Per Hour to Knots
Miles Per Hour to Kilometers Per Hour
Miles Per Hour to Light Speed
Miles Per Hour to Mach
Miles Per Hour to Meters Per Second
Meters Per Second to Kilometers Per Hour
Meters Per Second to Miles Per Hour