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)
The Dtmb Mark I Knotmeter
1964
2 pages
Report
No indication
English
METERS , SHIPS , VELOCITY , TOWING CABLES , TOWED BODIES , HANDLING , INSTRUMENTATION , TACHOMETERS , HYDRODYNAMICS , TRANSDUCERS , IMPELLERS , CALIBRATION , THEORY , OPERATION , DESIGN , DISPLAY SYSTEMS , DIGITAL SYSTEMS , KNOTMETERS
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