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Meeting	ACGS Committee Meeting 108 - Gettysburg - October 2011
Agenda Location	10 SUBCOMMITTEE D – DYNAMICS, COMPUTATIONS, AND ANALYSIS 10.2 Inflight Simulation and Handling Quality Examination of a Flying Wing
Title	Inflight Simulation and Handling Quality Examination of a Flying Wing
Presenter	Dominik Niedermeier and Jana Ehlers
Affiliation	DLR
Available Downloads*	presentation
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Abstract	In-Flight Simulation and Handling Quality Examination of a Flying Wing D.Niedermeier, J.Ehlers German Aerospace Centre (DLR), Braunschweig ACGSC Meeting 108, 11 – 14 October 2011, Gettysburg, PA The assurance of appropriate handling qualities represents a critical aspect for the development of a flying wing. The presentation shows an analysis and evaluation of the handling qualities of a flying wing configuration for 750 passengers. In a detailed theoretical pre-examination the handling qualities of the baseline-configuration of this aircraft have been analyzed with analytical methods and evaluated using analytical handling qualities criteria. However these criteria have been developed for conventional airplanes and imply that the longitudinal and lateral motion of the aircraft can approximately be considered as separate motions. As the longitudinal and the lateral motion of the considered flying wing are strongly coupled, this prerequisite is not fulfilled and the applicability of the analytical criteria is not guaranteed. Hence an additional evaluation of the handling qualities by pilots is absolutely required. For this purpose an in-flight simulation has been carried out with the DLR research aircraft ATTAS using nonlinear model-following control in order to match the dynamics of a simulated aircraft. Specific flight dynamics of the flying wing configuration that are examined during the in-flight simulation include the unsatisfactory Dutch roll characteristics and distinct yaw motion of the flying wing during turns as well as the strong pitch-up tendency at high sideslip angles. Furthermore the implementation of a basic control law is used to evaluate the potential to improve the handling qualities of the flying wing by automatic flight control.