MANEUVERING CHARACTERISTICS OF LARGE TANKERS

While a wide-beam, full-form hull is one of the most promising designs for supercarriers, it is important to evaluate the maneuvering characteristics at its design stage, because of possible inherent dynamic course instability due to its particular configuration. Accordingly, the effect of inherent dynamic course stability on ship handling was examined for three ship configurations having various degrees of inherent stability through computer-based analyses. To ensure a realistic representation of ship dynamic motions, the mathematical model used was based on hydrodynamic data determined from captive model tests. A summary chart is shown to indicate the directionally stable region for the three ships. A ship with a large degree of inherent instability requires a high sensitivity in detecting heading error to achieve directional stability. Motion predictions in zig-zag and spiral maneuvers indicate that a ship, which has a large degree of instability with approximately 10-deg of hysteresis loop in spiral tests, has a tendency to divert from a straight course having a large overshoot in heading change. Since the stern configuration has a profound effect on course stability, an increase in rudder effectiveness can be one of the possible solutions for satisfactory performance. Thorough examination of the design configuration is recommended at its planning stage.

• Supplemental Notes:
  • Presented at the Super Ocean Carrier Conference, New York, N.Y., Jan. 1974.
• Corporate Authors:

  Super Ocean Carrier Conference

  P.O. Box 269, Berth 84
  San Pedro, CA  United States  90733
• Authors:
  • Eda, H
• Conference:
  • Presented at the Super Ocean Carrier Conference, New York, N.Y., Jan. 1974.
• Publication Date: 1974-1

Media Info

• Pagination: p. 379-400

Subject/Index Terms

• TRT Terms: Maneuverability; Maneuvering; Mathematical models; Ships; Supertankers; Vehicle design
• Uncontrolled Terms: Ship design
• Old TRIS Terms: Course stability
• Subject Areas: Design; Marine Transportation; Terminals and Facilities; Vehicles and Equipment;

Filing Info

• Accession Number: 00054403
• Record Type: Publication
• Source Agency: Super Ocean Carrier Conference
• Files: TRIS
• Created Date: Jul 15 1974 12:00AM