THE DTMB MARK I KNOTMETER.

Abstract

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)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0610073

Entities

People

  • George B. Springston Jr.

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Actuators
  • Contrast
  • Electrical Equipment
  • Flight Instruments
  • Ground Position Indicators
  • Impellers
  • Indicators
  • Instrumentation
  • Measuring Instruments
  • Mechanical Equipment
  • Navigational Equipment
  • Rotation
  • Towed Bodies
  • Transducers

Readers

  • Aerospace Test and Evaluation
  • Electrical Engineering
  • Marine Hydrodynamics