How does a boat measure speed?
Asked by Rashmi Shina on 16 January 2010 1:21:31 PM   
   
   
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  1. On 17 March 2010 1:52:41 PM Reshma Farooki answered :

    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.
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