Abstract
A great database has been generated in the Lateral High Order System(LATHOS)programtosupporthandling qualitiesinvestigations of e ghter aircraft in the roll axis. 5 This e ight test programalso includes data and an analysis of RR. It has been shown that a low roll mode time constant increases the potential for RR. Closed-loop models of pilot-aircraft systems are suitable tools for RR investigations. An early approach was made by using a modie cation of the crossovermodelthatindicatedclosed-looppilot-aircraftoscillations of2 to3 Hz (Ref.6).However, RRmay also occur in large transport aircraft because of aeroelastic effects such as those observed with a C-17 aircraft. 7 In this Note a unie ed approach for RR analysis is presented. A new four-body manipulation model including the control stick, the pilot’ s arm, torso, and hip is used within a closed-loop pilot-aircraft system. The model is successfully applied to an RR incident of the F-16 XL. A new RR prediction criterion based on stability margins in the frequency domain is presented. Background
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