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How is boat speed measured?

Updated: 10/20/2022
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14y ago

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Boat speed is measured in Knots. 1 knot = 1.1 mile per hour. So 10 knots = 11mph.

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Q: How is boat speed measured?
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If your speed is measured in 10 knots you are riding a?

boat or ship.


What is the speed of a speed boat?

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Knots one nautical mile per hour there are 1 1/8 of a nautical mile in a statute mile Originally measured by throwing a piece of wood attached to a piece of rope over the back of a boat and counting how many knots went past in a given time. These days it is more normally measured by: a/ using a pitot static tube which measure difference in pressure and uses bernoulli's equation (enter into wikipedia as is easier to read) to find the velocity. b/ Some form of propeller (technically impeller) which is suspended under the boat. The passing water turns, the speed of rotation is measurred and this gives you the speed of the boat. c/Using ultrasonics to measure the speed that small bubbles of air in the water passing under the boat go past.