Theoretical and experimental investigations have yielded much information on the performance of bow thrusters; in particular, the decrease in effectiveness as forward speed increases is well known. The influence of various factors on the effectiveness of stern thrusters is, however, little known, and the Authors have therefore investigated, in model tests, the effects of ship speed and water depth on these thrusters. The tests were carried out on a 3-m model of a twin-screw ocean ferry, fitted with a bow and a stern thruster, and a 2.5m model of a tanker, fitted with a stern thruster only. It was found that ship speed has a large influence on stern-thruster performance, and that this influence is very different from that of ship speed on the bow thruster. In deep water, the hydrodynamic forces produced by the stern thruster do not decrease as much as those from the bow thruster. In shallow water, the lateral force due to the stern thruster increases with ship speed, and may amount to several times the lateral force produced at zero forward speed. The Authors discuss these phenomena, and present an explanation for this increase in lateral force from the stern thruster by an analogy with jet-flap wings. Order from BSRA as No. 49,782.

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  • Corporate Authors:

    Kansai Zosen Kyokai, Osaka University

    Aza-yamadaue, Suitashi
    Osaka,   Japan 
  • Authors:
    • Fujino, M
    • Saruta, T
    • IDA, T
  • Publication Date: 1978-3


  • Japanese

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  • Accession Number: 00189257
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 28 1979 12:00AM