Tests were made in 8-ft high-speed wind tunnel to determine the drag reduction possible by eliminating the barrel jacket of a protruding 50-caliber aircraft gun. It was found that the drag of a standard aircraft gun protruding into the air stream at right angles to the flow can be reduced by 23% by discarding the barrel jacket. At 300 mph and sea-level conditions, this amounts to a decrease in drag of from 83 to 64 pounds. A rough surface finish on the barrel was found to have no adverse effects on the drag of the barrel, the drag being actually less at high Mach Numbers.


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    Title :

    Drag Measurements of a Protruding .50-Caliber Machine Gun with Barrel Jacket Removed


    Contributors:
    A. A. Luoma (author)

    Publication date :

    1943


    Size :

    19 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Drag measurements of protruding 0.50-caliber machine gun

    Luoma, A.A. | Engineering Index Backfile | 1941



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    Silton, Sidra / Dinavahi, Surya | AIAA | 2008


    Base Drag Considerations on a 0.50-caliber Spinning Projectile

    Silton, S. / Dinavahi, S. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2008