knots versus mph - SailNet Community
Old 11-28-2002 Thread Starter
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knots versus mph

How do they convert? I haven''t seen this in any of my reading.
RookieHunter is offline

Old 11-29-2002
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knots versus mph

RookieHunter,

A statute mile is 5,280 feet and a nautical mile is 6,076 feet. Since mph refers to statute miles and knots refers to nautical miles, just take the ratio of 1.15 (close enough but not quite exact). So if a boat is traveling at 10 knots, it is going 11.5 mph, or 15% more in that unit of measurement.

BTW, I couldn''t recall the exact number of feet for the nautical mile, so I did a quick web search with the words "nautical" "statute" and "knot" and up popped many useful sites.

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knots versus mph

A nautical mile is 1/60th of the length of a degree (or one second) of a great circle of the earth.

The nautical mile is often miscalled "Knot". A knot is a not a measure of distance, but a measure of speed equal to one nautical mile per hour. The admiralty knot is equal to 6080 feet per hour. Therefore a knot is 6080/5280 = 1.1515151... to a statute mile.

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knots versus mph

That last sentence should have read, "a knot is 1.515151... statute miles per hour.

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knots versus mph

A knot isn''t 1.5 miles per hour, Its close to 1.1 MPH.

tsenator is offline
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knots versus mph

A knot is a measurement of speed.One knot is one nautical mile per hour. A nautical mile equals 1.15 statute mile.
Marc
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Old 11-30-2002
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knots versus mph

I typed faster than I thought. There should have been a ''1'' after the decimal point and in front of the ''5''. Thanks for the correction.

An admiralty nautical mile is 1.15151... statute miles. A knot is 1.15151... miles per hour.

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