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Influence of Aileron Placement on Roll Response of High-Aspect-Ratio-Wing Aircraft

AIAA 2020-2645
Session: Aircraft Concept Design, Tools and Processes III
Published Online:

The need for improving fuel efficiency of civil transport aircraft is leading to design high-aspect- ratio-wing configurations that have high aerodynamic performance. However, these configurations exhibit higher structural flexibility, which degrades aileron effectiveness and roll maneuverability. This paper investigates the influence of aileron spanwise placement on roll characteristics of a high-aspect-ratio-wing aircraft. Roll responses for multiple aileron layouts, with and without wingbox passive aeroelastic tailoring, are discussed to highlight best design practices for improving roll maneuverability in future civil transport aircraft with high-aspect- ratio wings. Results show that ailerons of high-aspect-ratio-wing aircraft should not be placed at a larger distance from the wing root than in aircraft with regular aspect ratios to provide adequate roll maneuverability. Moving the ailerons toward wing midspan maximizes aileron effectiveness, and thus, increases roll maneuverability. Increasing the wingbox out-ofplane bending stiffness and providing a positive coupling of out-of-plane bending and torsion also improves roll maneuverability. However, wingbox passive aeroelastic tailoring offers only slight benefits for more inboard aileron placement and low dynamic pressure.