Accession Number:

AD0610073

Title:

THE DTMB MARK I KNOTMETER.

Descriptive Note:

Research and development rept.,

Corporate Author:

DAVID TAYLOR MODEL BASIN WASHINGTON D C

Personal Author(s):

• Springston,George B. ,Jr.

Report Date:

1964-12-01

Pagination or Media Count:

31.0

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

Descriptors:

• *MEASURING INSTRUMENTS
• *SHIPS
• VELOCITY
• VELOCITY
• TOWING CABLES
• TOWED BODIES
• HANDLING
• INSTRUMENTATION
• TACHOMETERS
• HYDRODYNAMICS
• TRANSDUCERS
• IMPELLERS
• CALIBRATION
• OPERATION
• DISPLAY SYSTEMS
• DIGITAL SYSTEMS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE