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2006-11-03 10:20:21 · 6 answers · asked by Matt H 1 in Cars & Transportation Boats & Boating

6 answers

A knot is the rate of change of nautical miles per unit time. A nautical mile is one minute of arc on a great circle. If a vessel travels one degree on a great circle in four hours, then it is going 15 kt (60 nm/4 hours) A statute mile is a linear distance on a plane. One is spherical and the other is flat. The conversion factors shown earlier can be used only in short distances where the variance is slight.

2006-11-03 16:15:33 · answer #1 · answered by Richard B 4 · 0 0

Good Evening Sir:

In easy to use numbers,
One Knot = 1.15 Miles Per Hour (rounded off)

For more precision...
1 mile per hour = 5280 Feet Per Hour
1 knot per hour = 6076 Feet Per Hour

If you are a sailor;
6 kts = 6.9 mph (roughly)

If you are a Power Boat Person;
25 kts = 28.75 mph (roughly)

I like the 1.15 number because it is easy to remember,
and do math with. None of my boat work requires
extreme precision, except payment for the fuel.

2006-11-07 17:49:50 · answer #2 · answered by zahbudar 6 · 0 0

KNOTS V MILES PER HOUR




Knots is how the speed of aircraft and boats is measured. Both miles per hour and knots is a speed which is the number of units of distance that is covered for a certain amount of time.



1 knot = 1 nautical mile per hour = 6076 feet per hour
1 mph =1 mile per hour = 5280 feet per hour



For example, if a train is moving at 50 mph on a track, how would you represent this speed in knots (even though trains are not usually represented in knots)?



To do this problem easily, one can multiply the number of miles per hour that the train is moving by the number of feet per hour that = 1 mph. this converts the speed to a distance traveled in one hour.


That is:-



(50 mph)(5280 feet/ mph)=264,000 feet


Now, divide that distance by the number of feet in a nautical mile (6076).




(264,000 feet)/(6076 feet/ knot) = 43.4 knots




In aerodynamics, speed is also measured by the Mach number, which is the ratio of the speed of the object to the speed of sound. Mach 1 means that you are traveling at the speed of sound or 661.7 knots, or


Mach 1 = 661.7 knots


How would you determine the speed of sound in mph?


Since


661.7 knots = (661.7 nautical miles/hr) (6076 feet/nautical miles)


= 4,020,489.2 feet/hr



and


(4020489.2 ft/hr)/(5280 ft/mile)=761.5 mph


We can say that Mach 1 = 761.5 mph at sea level.



Since the speed of sound varies with the density of air ( or whatever material it is transmitted through), one needs to determine the density of the air the aircraft is flying through. To compute this, we will use the chart shown below, called the International Civil Aviation Organization Table, or I.C.A.O.

Notice as the altitude increased, the density of air decreases as does the speed of sound in knots.








--------------------------------------------------------------------------------







CONVERSION TABLE FOR KNOTS TO MILES PER HOUR KTS - MPH





5 Knots = 5.8 MPH
10 Knots = 11.5 MPH
15 Knots = 17.3 MPH
20 Knots = 23.0 MPH
25 Knots = 28.8 MPH
30 Knots = 34.6 MPH
35 Knots = 40.3 MPH
40 Knots = 46.1 MPH
45 Knots = 51.8 MPH
50 Knots = 57.6 MPH
55 Knots = 63.4 MPH
60 Knots = 69.1 MPH
65 Knots = 74.9 MPH
70 Knots = 80.6 MPH
75 Knots = 86.4 MPH
80 Knots = 92.2 MPH
85 Knots = 97.9 MPH
90 Knots = 103.7 MPH
95 Knots = 109.4 MPH
100 Knots = 115.2 MPH
105 Knots = 121.0 MPH
110 Knots = 126.7 MPH
115 Knots = 132.5 MPH
120 Knots = 138.2 MPH
125 Knots = 144.0 MPH
130 Knots = 149.8 MPH
135 Knots = 155.5 MPH
140 Knots = 161.3 MPH
145 Knots = 167.0 MPH
150 Knots = 172.8 MPH

2006-11-03 18:24:40 · answer #3 · answered by OU812 5 · 2 0

1 knot = 1.15077945 mph

Take a look here....

http://www.disastercenter.com/convert.htm

2006-11-03 18:24:08 · answer #4 · answered by sarch_uk 7 · 1 0

Search window! Type in: define and then nautical speed.

2006-11-03 18:23:10 · answer #5 · answered by vanamont7 7 · 0 0

My ***, you little *****

2006-11-03 18:27:37 · answer #6 · answered by jimmybellich 1 · 0 1

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