1986/10/01 by Knut Wilhelm, D. Schafranek · 1 citation
Engineering · Environmental Science · #Aerospace and Aviation Technology #Air Traffic Management and Optimization #Advanced Aircraft Design and Technologies #Longitudinal static stability #Aerodynamics #Aircraft flight mechanics #Flight test #Stability derivatives #Chord (peer-to-peer) #Flight simulator #Aerospace engineering #Stability (learning theory) #Angle of attack #Aeronautics #Simulation #Computer science #Engineering
paper · doi:10.2514/3.45377
openalex publication_date 1986/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
A flight test program was performed by DFVLR utilizing the HFB 320 in-flight simulator to investigate flying qualities problems associated with the relaxation of natural longitudinal static stability. The main objective of this research program was to investigate the influence of e.g. position on landing approach flying qualities. The static margin was varied from 14 to -10% mean aerodynamic chord (MAC) by rearward translation of the e.g. In addition, the influence of pitch damping and pitch control effectiveness on the flying qualities of an unstable aircraft configuration was studied. Nine configurations were evaluated by four pilots, who flew a total of 181 landing approaches under different natural atmospheric conditions. Cooper-Harper pilot ratings and special effort ratings, as well as statistical values computed from measured performance data of the pilot aircraft system, are presented as a function of the parameters varied and the turbulence intensity.