Two airship models were tested in the N.A.C.A. variable-density wind tunnel to determine the drag coefficients at zero pitch, and the effect of fins and cars and of flat and streamline protuberances located at various positions along the hull. During the investigation the stern of one model was rounded off to produce a blunter shape. The extreme range of the Reynolds Number based on the over-all length of the models was from 1,300,000 to 33,000,000. At large values of the Reynolds Number the streamline protuberance affected the drag very little, and the additional drag caused by the flat protuberance was less than the calculated drag of the protuberance along. The fins and cars together increased the bare-hull drag about 20 per cent.


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    Title :

    Drag of Two Streamline Bodies as Affected by Protuberances and Appendages


    Contributors:

    Publication date :

    1932


    Size :

    12 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







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