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If the length of waterline is given in metres and desired hull speed in knots, the coefficient is 2.43 kn·m −½. The constant may be given as 1.34 to 1.51 knot·ft −½ in imperial units (depending on the source), or 4.50 to 5.07 km·h −1 ·m −½ in metric units, or 1.25 to 1.41 m·s −1 ·m −½ in SI units.
The knot count would be reported and used in the sailing master's dead reckoning and navigation. This method gives a value for the knot of 20 + 1 ⁄ 4 inches per second or 1.85166 kilometres per hour. The difference from the modern definition is less than 0.02%. Derivation of knots spacing:
15 knots (28 km/h; 17 mph) USNS Fast Tempo is an ocean tug and supply ship for the United States Sealift Command . She was originally named MV Fast Tempo before being acquired by the United States Navy .
Initially, the markings were simply knots in the line. Later, sailors worked knotted cords into the log-line. 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.
10.20 knots (18.89 km/h) 10d 05h 14m 20s [Multihull] Paul Ricard (trimaran) Éric Tabarly: Éric Bourhis, Georges Calvé, Dominique Pipat 1980 12.15 knots (22.50 km/h) 9d 10h 06m 34s Elf Aquitaine: Marc Pajot: 1981 13.18 knots (24.41 km/h) 08d 16h 36m Jet Services 2: Patrick Morvan: Jean Le Cam, Marc Guillemot, (Serge Madec) 1984 14.29 knots ...
Its predecessor, the Alfa class, could attain short speed bursts of 40–45 knots (74–83 km/h; 46–52 mph) while submerged. [4] [5] There are also claims that the Soviet twin-propeller submarine K-222, with titanium inner and outer hulls, reached 44.7 knots (83 km/h; 51 mph), fully submerged, during sea trials in 1969.
< 1 knot < 1 mph < 1 km/h 0–0.2 m/s: 0 ft 0 m Sea like a mirror Smoke rises vertically 1 Light air 1–3 knots 1–3 mph 1–5 km/h 0.3–1.5 m/s 0–1 ft 0–0.3 m Ripples with appearance of scales are formed, without foam crests Direction shown by smoke drift but not by wind vanes 2 Light breeze 4–6 knots 4–7 mph 6–11 km/h
Douglas also became the world's third over-50 knots sailor, when on 8 September he made a 50.54 knots (93.60 km/h) run. [11] The current speed record over a 500 meter (1,640 ft) course for a kiteboard, officially ratified by the World Sailing Speed Record Council , is 55.65 kn , held by Robert Douglas, and set in Luderitz, Namibia in October 2010.