The Twin ASH-25 is a low-cost High Altitude Long Endurance (HALE) Aircraft, built up from various ASH-25 glider components. As a part of the Twin feasibility study, an aeroelastic analysis has been performed, using the finite element code MSC/NASTRAN. A finite element model of the flexible aircraft has been used to calculate maneuver loads, gust loads, control reversal-, divergence- and flutter speed. The propeller whirl speed has been calcualted analytically. Purpose of this analysis was to check if the Twin design complies with FAR-23 regulations concerning aeroelasticity phenomena. Flutter occurred and a design modification has been proposed to comply with FAR 23. Design and manufacturing constraints considering the aeroelastic behavior of the Twin have been determined by a sensitivity analysis. The analyses show that the modified design complies with FAR 23 regulations and that the design is feasible concerning aeroelasticity regulations.


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    Title :

    Aeroelastic Analysis of the Twin ASH-25 High Altitude Long Endurance Aircraft Using MSC/NASTRAN


    Contributors:

    Publication date :

    1997


    Size :

    284 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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