The results of an investigation to determine the tolerable (safe for normal fighter operation) range of effective dihedral on a conventional fighter airplane are presented. The test airplane was equipped with a special device for varying the effective dihedral in flight over a large range of positive and negative values. The results of quantitative flight measurements of the effective dihedral and the dynamic-lateral-stability characteristics are shown. A survey of pilots' opinions was made to determine which values of effective dihedral were intolerable. It was found that small amounts of negative dihedral (of the order of -5 deg) could be tolerated by the pilots at both landing- approach and cruising speeds and that values of positive dihedral greater than 20 deg could be tolerated. It was found, in fact, that at landing-approach speeds, an effective dihedral high enough (28.4 deg) to produce oscillatory instability could be tolerated. The occurrence of rolling velocity reversals during rudder-fixed aileron rolls with high positive values of dihedral did not adversely affect the pilots' opinions of the over-all lateral handling characteristics. The relation between the findings of this investigation and the present Air Force-Navy stability and control specifications is discussed.


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    Titel :

    Flight Determination of the Tolerable Range of Effective Dihedral on a Conventional Fighter Airplane


    Beteiligte:
    C. J. Liddell (Autor:in) / R. D. Van Dyke (Autor:in) / D. R. Heinle (Autor:in)

    Erscheinungsdatum :

    1949


    Format / Umfang :

    24 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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