This chapter discusses the forces acting on propeller blade sections and the differences between model scale and full scale caused by the difference in Reynolds numbers. The decisive difference between the flows over model scale and full scale blade section is the much higher Reynolds number for the full scale flow. Consequently, the drag coefficient of the full scale blade section is smaller than for the model scale section. The chapter shows vectors of both model and full scale section forces. The full scale forces have been scaled down so that the lengths of the lift force vectors have the same length in the sketch. Due to the better lift‐drag ratio, the full scale resultant force points more in the direction of the propeller shaft than the resultant model force. The chapter closes with a description of the recommended ITTC procedure for full scale predictions from open water tests.


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    Title :

    Full Scale Propeller Performance


    Contributors:

    Published in:

    Publication date :

    2019-05-06


    Size :

    7 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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    Marine propeller blade vibrations: Full scale tests

    Burrill, L.C. | Engineering Index Backfile | 1946


    Marine propeller blade vibrations: Full scale tests

    Burrill, L.C. | Engineering Index Backfile | 1946