In cooperation with the Engineering Division of the Air Service of the United States Army, a Liberty-12 engine has been tested at the Bureau of Standards. The program of tests was planned to yield that information considered most important in determining the value of the engine for aviation. Full power runs were made at the ground, at 25,000 feet, and at several intermediate altitudes. To determine the mechanical efficiency of the engine, friction horsepower was measured at the ground and at 15,000 feet. As a basis for predicting engine performance with a propeller, a series of tests was made in which the dynamometer load and engine throttle were adjusted at each speed to simulate the engine load which would be imposed at that speed by a propeller operating under normal full load at 1,700 r.p.m. Among the quantities calculated from the test measurements are: brake horsepower; break mean effective pressure; fuel consumption; mixture ratio; mechanical, thermal, and volumetric efficiency; and the percentage of the heat in the fuel appearing in the jacket water and in the exhaust. Jacket water temperature, oil temperature, manifold pressure, etc., are recorded to show the conditions under which the test was made.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Performance of a Liberty 12 airplane engine


    Contributors:
    Sparrow, S W (author) / White, H S (author)

    Publication date :

    1921-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English



    Performance of a Liberty 12 airplane engine

    Sparrow, S.W. / White, H.S. | Engineering Index Backfile | 1921


    Making liberty airplane motor parts

    Engineering Index Backfile | 1919


    Gaging airplane-engine performance

    Geisse, J.H. | Engineering Index Backfile | 1930


    Gaging Airplane-Engine Performance

    GEISSE, J. H. | SAE Technical Papers | 1930


    Airplane performance determined by engine performance

    Upton, G.B. | Engineering Index Backfile | 1918