Rough conventional, smooth conventional, and laminar-flow or low- drag sections were tested. The items covered are rotor thrust for fixed power in hovering, range and endurance at cruising speed, and power required at high- forward speed. Calculations indicated that a smooth conventional section gives marked performance gains. Smaller gains are obtainable by using a low-drag section. At high speeds or loads the low-drag section is inferior to the smooth conventional section.


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    Title :

    Effect on Helicopter Performance of Modfiications in Profile-Drag Characteristics of Rotor-Blade Airfoil Sections


    Contributors:

    Publication date :

    1944


    Size :

    50 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English