Investigations were conducted in the Ames 40- by 80-Foot Wind Tunnel to determine the aerodynamic characteristics of a large-scale subsonic jet transport model with an upper surface blown flap system. The model had a 25 deg swept wing of aspect ratio 7.28 and four turbofan engines. The lift of the flap system was augmented by turning the turbofan exhaust over the Coanda surface. Results were obtained for several flap deflections with several wing leading-edge configurations at jet momentum coefficients from 0 to 4.0. Three-component longitudinal data are presented with four engines operating. In addition, longitudinal and lateral data are presented with an engine out. The maximum lift and stall angle of the four engine model were lower than those obtained with a two engine model that was previously investigated. The addition of the outboard nacelles had an adverse effect on these values. Efforts to improve these values were successful. A maximum lift of 8.8 at an angle-of-attack of 27 deg was obtained with a jet thrust coefficient of 2 for the landing flap configuration. (Author)


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    Title :

    Wind Tunnel Investigation of a Large-Scale Upper Surface Blown-Flap Model Having Four Engines


    Contributors:
    K. Aoyagi (author) / M. D. Falarski (author) / D. G. Koenig (author)

    Publication date :

    1975


    Size :

    69 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Wind Tunnel Investigation of an Improved Upper Surface Blown-Flap Transport Semi-Span Model

    Iwasaki, Akihito / Fujieda, Hirotoshi / Takahashi, Hitoshi et al. | SAE Technical Papers | 1991