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en.wikipedia.org/wiki/Knot_(unit)

The knot is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.15078 mph. The ISO Standard symbol for the knot is kn. The same ...

en.wikipedia.org/wiki/Beaufort_scale

The Beaufort scale /ˈboʊfərt/ is an empirical measure that relates wind speed to observed .... 17–21 knots, 6–9 ft ... Met Éireann issues a "Small Craft Warning" if winds of Beaufort force 6 (mean wind speed exceeding 22 knots) are expected up ...

www.calculateme.com/speed/knots/to-miles-per-hour/21

What is 21 kn in mph? How fast is 21 knots? This page will convert 21 knots to miles per hour.

www.metric-conversions.org/speed/knots-to-miles-per-hour.htm

21 knots, 24.17 mph. 22 knots, 25.32 mph. 23 knots, 26.47 mph. 24 knots, 27.62 mph. 25 knots, 28.77 mph. 26 knots, 29.92 mph. 27 knots, 31.07 mph. 28 knots ...

www.metric-conversions.org/speed/knots-to-miles-per-hour-table.htm

21 knots, 24.17 mph. 22 knots, 25.32 mph. 23 knots, 26.47 mph. 24 knots, 27.62 mph. 25 knots, 28.77 mph. 26 knots, 29.92 mph. 27 knots, 31.07 mph. 28 knots ...

www.convert-me.com/en/convert/speed/knot.html

Conversion chart for knot (Nautical, speed conversion). Instant units and measurements conversion, metric conversion and other systems. Many units supported ...

www.grc.nasa.gov/WWW/k-12/WindTunnel/Activities/knots_vs_mph.html

Jun 12, 2014 ... 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 ...

www.disastercenter.com/convert.htm

Knots. = 5.8. MPH. 10. Knots .... 34 km/h, 17-21 kts 19-24 mph 29-38 km/h, Fresh, Fresh breeze, Rough, Moderate waves, taking a more pronounced long form.

www.ask.com/youtube?q=How+Fast+Is+21+Knots%3F&v=36VzHxqYAa0
Jan 7, 2012 ... On December 21, 2008, the Hydroptère briefly reached 56.3 knots (104.3 km/h; ... you can use the energy of the wind to propel you faster then a ...