Wake and thrust deduction were determined by test with models of a fishing trawler and a bulk carrier. The experiments were carried out at several different speeds, both ahead and astern, and with various revolutions. The following combinations were studied: (1) ship going ahead, propeller going ahead (V positive, n positive (1st quadrant)) (2) ship going astern, propeller going ahead (V negative, n positive (2nd quadrant)) (3) ship going ahead, propeller going astern (V positive, n negative (3rd quadrant)) (4) ship going astern, propeller going astern (V negative, n negative (4th quadrant)). The trawler model was tested with 2 different propellers. Propeller diagrams were prepared giving the thrust coefficient K sub t, the torque coefficient K sub q, and resistance plus tow rope pull coefficient K sub r as functions of the advance number J' for all these combinations. Furthermore, the wake coefficient w and the thrust deduction coefficient t have been shown as functions of the advance number. Finally, manoeuvre nomograms for the two models were also prepared. (Author)


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    Title :

    Wake and Thrust Deduction at Extreme Propeller Loadings


    Contributors:

    Publication date :

    1967


    Size :

    52 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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