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1 international knot = 1 nautical mile per hour (by definition), 1 852.000 metres per hour (exactly), [5] 0.51444 metres per second (approximately), 1.15078 miles per hour (approximately), 20.25372 inches per second (approximately) 1.68781 feet per second (approximately). The length of the internationally agreed nautical mile is 1 852 m.
15 90–99 knots 104–114 mph 166–183 km/h 16 100–108 knots ... (mean wind speed exceeding 22 knots) are expected up to 10 nautical miles offshore. Other ...
More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a sound wave is propagating.
Many ships used knots spaced 8 fathoms (48 feet or 14.6 meters) apart, while other ships used the 7-fathom prescription. [8] The time interval needs to be adjusted according to the distance between knots. Substituting 6,000 feet for 1 mile, the above formula yields 28.8 seconds for a distance of 8 fathoms.
A basic airspeed indicator with the indicated airspeed (IAS) indicated in knots ("Kt" or "Kts" or "KIAS") -- the most common unit of measure for airspeed. Some airspeed indicators in aircraft prior to the mid-1970s indicate in miles per hour plus knots (1 knot = 1.15 mph) or kilometers per hour (1 knot = 1.85 km/h).
The distance is around 2,880 nautical miles (5,330 km; 3,310 mi). Crewed [2. Time Yacht Skipper Crew Date Average speed 12d 04h 01m 19s ... 15.42 knots (28.56 km/h)
The Parsons turbines were more economical than the Rateau-Bretagne turbines which gave those ships equipped with them a range of 2,900 nautical miles (5,400 km; 3,300 mi) versus 2,700 nmi (5,000 km; 3,100 mi) at 15 knots (28 km/h; 17 mph).
Francis Joyon rounds Cape Horn, 16 days after riding off of South America, and after a course of nearly 12,000 miles above an average of 30 knots (730.16 miles / 24 h over 16 days). He then signs a performance increase of between 30 and 40% compared to the record to be broken by Loïck Peyron 5 years earlier.