Browsing by Author "Pienaar, D van V"

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    Longitudinal stability and control analysis and parameter sensitivity investigation of fixed wing aircraft in ground proximity using various aerodynamic approaches
    (2000) Pienaar, D van V; Redelinghuys, Christiaan
    The investigation of the stability of longitudinal motion of fixed wing aircraft in ground proximity presented here focuses on rectangular wing and tail configurations similar to that of the Piper Cherokee PA-28-180. The majority of our results pertain to the height range down to one quarter of the wing span, and th main objectives of the investigation were the following: to reveal the physical nature and causes of the instability encountered in the close ground proximity; to assess the influence the design parameters such as the centre of the mass placement, tail length, tail height and wing aspect ration have on the stability of longitudinal motion; and to suggest a feedback control strategy that would alleviate the instability.