Question:
Why do ships measure their speed in Knots and not MPH.Air pilots do the same, Why?
Answers:
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Because it is measuring the acceleration and not the constant speed. I think.Where are some good firewalls?
Same reason some use kilometer per hourWhen I change from the 2bbl to 4bbl how do I change the setting on the ECM your talking about?
This goes back to the old days when sailing ships were the only type. Sailors would tie knots in a rope spaced at certain intervals and drag it behind the ship. Depending on how many knots were exposed, that was the speed they were traveling at. This led to distances being measured in knots.What is the distinction between a boat and a ship?
Because knots are speed through the air or water and not linearmiles or kilometers per hour, there was a classic case where a Fairey Swordfish took off into a stiff headwind slowed down to minimum flying speed travelled backward across the airfield inceased speed and landed, it was doing perhaps 45 knots airspeed yet 0 mph in fact a minus amout of mph.
Aircraft measure their speed in mach, mach 1 being the speed of sound, because indicated airspeed decreases with increasing altitude, so 250 knots indicated could be 300mph or 500mph or more depending upon altitude.
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Because they are measuring their speed through the water (or air) and not their speed across the ground.Some years ago I heard about a light aircraft flying over New York and although travelling at 50kts was actually going backwards due to a headwind of 55kts
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Knots is nautical miles per hour. A nautical mile is a measure of the earth. It is a minute of latitude. On the water and in the air you need to measure by what you have, as you have no roads.what size prop would you expereanced boater use on a 19ft,125 hp force bayliner boat?
The 2 Dave's are talking about air speed. It has nothing to do with knots or mph. A knott it 6060' a statute mile is 5280. Knott comes from the distance arond the equator being divided into equal parts. Minutes of longitude as measured at the equator.It's an internationally agreed standard for quoting air & nautical speeds.
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1 international knot = 1.000 nautical mile/hour = 1.852 km/h 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 1852.249m), the UK in 1970 (which previously used the UK or Admiralty nautical mile of 1853.184m) 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.
Having said that, Russian aircraft use kilometers per hour!
Knots were invented 1st that's why ships use knots. Pilots used to call their aircraft ships and may have adopted the knot system to differentiate themselves from the newly emerging technology of the automobile. This however is only a guess and the true answer has probably been lost to time.
One of the main reasons listed in wikipedia that knots are used in sea travel is that ships rely on accurate ocean charts to navigate (unless using GPS). Since a nautical mile is defined as 1/60th of one degree latitude at the equator, and all maps are divided into degrees. it is far easier to measure accurate distances and speeds on maps using nautical miles and knots.
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