The wing stall problem encountered with tilt-wing V/STOL designs during low-powered descent flight conditions has led to buffeting which adversely affects both performance and handling qualities. The results of tests conducted in the Langley full-scale wind tunnel with a large semi­span model of a two-propeller tilt-wing configuration have indicated that three important factors provide substantial improvement in in the wing stall characteristics with consequent improvement in descent capability: down­-at-center propeller rotation resulted in delayed inboard stalling and pro­vided far better descent capability than the up-at-center rotation, moderate lowering of the propeller position relative to the wing chord provided further improvement in descent capability, and some flap deflec­tion was absolutely essential in order to have any descent capability for low-powered flight conditions. Use of all three factors should provide good descent capability even without the complexity of other sophisticated stall control devices.


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    Title :

    Descent capability of two-propeller tilt-wing configurations


    Contributors:

    Conference:

    Conference on V/STOL and STOL aircraft ; 1966 ; Mountain View, CA, US


    Published in:

    Publication date :

    1966-04-04


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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