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    Unknown
    Drag Measurements of a Protruding .50-caliber Machine Gun with Barrel Jacket Removed (1943)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: 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.
    Keywords: Aerodynamics
    Type: NACA-WR-L-581
    Format: application/pdf
    Location Call Number Expected Availability
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