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If your ship is going at 20 knots, that means it’s going 23 mph.
Ships and planes, which often travel longer distances due to the curvature of the earth, use knots. Knots are a more accurate way to predict how a boat (or plane) will traverse the earth’s surface. For this reason, nautical charts contain and depend on longitude and latitude.
A knot is defined as 1 nautical mile per hour and: 1.15078 miles per hour (approximately)
But if you’re talking about average speeds for different boats; Yes, 30 knots is fast enough to get the thrill.
Ships carried a rope called a logline with a weight attached to one end and knots in it every 47.25 feet. Sailors placed the weighted end in the water, and as the ship slid along, a spool of knotted rope unraveled. If a knot was subtracted every 28 seconds, the ship was traveling at 1 knot.
The term knot derives from its earlier use as a measure of length on ships’ log lines, used to measure a ship’s speed through the water. Such a line was marked at intervals by knots tied in the rope.
So 21 knots is about 24 miles per hour – and 30 knots is about 34 miles per hour). With large ships it doesn’t seem to matter if the boat is on or under water – the fastest submarines don’t go much above 40 knots – still slower than cars on the Autobahn.
What is a knot? Knots, also known as nautical miles, are units of measurement used by airplanes and ships to measure speeds. A knot per hour equals 1.15 miles per hour. The reason for using a different measurement method is that both boats and planes measure distances using longitude and latitude.
At ten knots the surface can get choppy, which is usually fine for coastal boats. However, conditions become harsher at 15 knots or more. So unless you have a very large boat, it’s best to avoid going out!
(Its length has changed significantly at different times and places; the legal mile is now 1,760 yards or 5,280 feet.) Such a linear measurement cannot be used at sea, so the nautical mile is based on the Length of a minute of arc (or 1/60 degree) of a great circle around the earth.
One knot equals one nautical mile per hour. Therefore, one knot is equal to 1.1508 miles per hour (1.1508 mph).
39-46 km/h 62-74 km/h 34-40 knots Storm or fresh storm Twigs and small branches break from trees, walking is difficult. Moderately large waves with foam inflated. 47-54 mph 75-88 km/h 41-47 knots Heavy gale Slight damage to buildings, clapboards being blown off.
Maximum speed: 63 knots [72 mph or 117 km/h] Sustained speed: 40 knots [46 mph or 74 km/h] Displacement: 240 tons. Range: 500 nautical miles | 575.4 miles | 926 km at 40 knots.
Ordinary cruise ships travel at 21 to 24 knots per hour, but a high-speed cruise ship can travel at speeds of up to 30 knots or more. Most cruise ships are powered by diesel-electric engines or gas turbines and have propellers that cut through the water to propel them forward or backward.
On days at sea it is common for a ship to slow down to follow favorable weather so passengers can enjoy the sun. This is especially the case when the distance to the nearest port is short. Sometimes the captain will even slow down a ship so everyone can see a sunset or other scenery passing by.