The aerodynamic characteristics of eight circular-arc airfoils at speeds of 0.5, 0.8, 0.95, and 1.08 times the speed of sound have been determined in an open-jet air stream 2 inches in diameter, using models of 1-inch chord. The lower surface of each airfoil was plane; the upper surface was cylindrical. As compared with the measurements described in NACA-TR-319, the circular-arc airfoils at speeds of 0.95 and 1.08 times the speed of sound are more efficient than airfoils of the R. A. F. or Clark Y families. At a speed of 0.5 times the speed of sound, the thick circular-arc sections are extremely inefficient, but thin sections compare favorably with those of the R. A. F. family. A moderate round of the sharp edges changes the characteristics very little and is in many instances beneficial. The results indicate that the section of the blades of propellers intended for use at high tip-speeds should be of the circular-arc form for the outer part of the blade and should be changed gradually to the R. A. F. or Clark Y form as the hub is approached.


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    Title :

    Aerodynamic characteristics of circular-arc airfoils at high speeds


    Contributors:
    Briggs, L J (author) / Dryden, H L (author)

    Publication date :

    1932-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English



    Aerodynamic characteristics of circular-arc airfoils at high speeds

    Briggs, L.J. / Dryden, H.L. | Engineering Index Backfile | 1930


    Aerodynamic characteristics of airfoils at high speeds

    Briggs, L.J. / Hull, G.F. / Dryden, H.L. | Engineering Index Backfile | 1925


    Aerodynamic characteristics of airfoils at high speeds

    Briggs, L. J. / Hull, G. F. / Dryden, H. L. | TIBKAT | 1928


    Aerodynamic Characteristics of Airfoils at High Speeds

    Briggs, L J / Hull, G F / Dryden, H L | NTRS | 1925


    Aerodynamic charcteristics of circular-arc airfoils at high speeds

    Briggs, L. J. / Dryden, H. L. | TIBKAT | 1930