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Multi-Flap Flying Wings Design, Stability and Efficiency


Flavio Gohl

Semester Thesis,HS 10 (10093)

In this thesis, the potential advantages of a multi-flap system for flying wings in terms of efficiency, static and dynamic stability is investigated. Furthermore the influence of design parameters of the wing plan-form are studied. For multi-flap flying wings, the common design software tools do not support optimization of flapped wings. A vortex lattice method for the aerodynamics as well as optimization routines for the wing geometry and flap deflections of a multi flapped wing have been implemented. Flight dynamic behaviour can be studied in the same framework as well. The framework allows detailed studies about the effect of plan-form parameters on the efficiency and on dynamic stability. A parameter study of the sweep angle shows that the dynamic stability behaviour of a swept wing is coupled with other parameters, such as aspect ratio and twist. The calculated example shows that a wing with a low sweep angle can have more dynamic longitudinal stability than a high swept wing, which is compared with reported flight tests of the SB13. For the cases considered in this thesis, efficiency does not always require a loss of stability. Finally it is shown that the multi-flap wing has a tremendous advantage compared to a single flap system. Elliptic lift distribution and moment equilibrium in the center of gravity can be achieved over a wide range of cl values, which is nearly impossible for twisted single flapped wings. i


Type of Publication:

(13)Semester/Bachelor Thesis

M. Quack

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2011:IFA_4116
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