A system to measure the speed of a ship through the water has been developed. The system consists of a cable-towed body, associated instrumentation, and handling equipment. A transducer in the towed body senses the rotation of an impeller on the body and sends a signal up the towcable for display on a digital indicator to provide a measure of the ship speed in the range from 3 to 30 knots. Under steady towing conditions, the speed can be determined to an accuracy of about one percent. In contrast to many speed measuring systems, the DTMB Mark I Knotmeter is not influenced by the characteristics of the ship since the transducer can be located outside the significant pressure field of the ship. (Author)


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    Title :

    The Dtmb Mark I Knotmeter


    Contributors:

    Publication date :

    1964


    Size :

    2 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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