MANEUVERING CHARACTERISTICS OF TANKERS--EFFECT OF DIFFERENT BALLAST DISPLACEMENTS ON SHIP PERFORMANCE

A study was made to evaluate the effect of ballast displacements on tanker maneuvering performance. A series of rotating-arm tests were made using a 5.17-ft. long model of a 250,000 DWT tanker to determine the necessary hydrodynamic coefficients for maneuvering motion predictions. Predictions of trajectories in entering turns, in Z-maneuvers, and in spiral maneuvers, indicate that the lightest loading condition (30% Load) among the three conditions examined in this study possesses the best overall maneuvering performance in calm water. An analysis based on the strip theory was made to estimate oscillatory yaw and sway motions in regular waves. Results indicate that the oscillatory yaw and sway motions are the largest for the lightest loading condition in quartering seas although the differences among the three conditions are not significant. It is expected that the lightest loading condition encounters the greastest difficulty in maneuvering under the presence of wind and wave disturbances.

  • Corporate Authors:

    Stevens Institute of Technology

    Davidson Laboratory, Castle Point Station
    Hoboken, NJ  USA  07030
  • Authors:
    • Eda, H
    • Klosinski, W E
  • Publication Date: 1973-7

Media Info

  • Features: References;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00048085
  • Record Type: Publication
  • Source Agency: Maritime Administration
  • Report/Paper Numbers: SIT-DL-73-1684
  • Contract Numbers: DOC 3-36299
  • Files: TRIS, USDOT
  • Created Date: Oct 31 1973 12:00AM