Path-Oriented Control Augmentation for Perspective Flight-Path Displays C. Borst * , M. Mulder † , M. M. van Paassen ‡ , J. A. Mulder § Delft University of Technology, Faculty of Aerospace Engineering, Delft, The Netherlands Flight-path predictor display augmentation and flight-path vector control aug- mentation concepts have been developed to improve pilot performance and reduce workload with a perspective flight-path display. A recent comparison study showed a preference for control augmentation, although some improvements could be made. Pilots command the direction of the aircraft motion and since in curved trajectories the direction must constantly change, they are required to hold the stick deflected dur- ing turns. It is also not clear how much stick deflection is needed during a particular turn. This paper discusses an augmentation concept that solves these issues. A path- oriented control augmentation is described in which the pilot commands the curva- ture of the aircraft future trajectory, shown as a perspective wireframe on the display. Results of an experiment, conducted in a fixed-base simulator, indicate that although pilot performance improved with the path-augmentation concept, pilot workload and control activity increased. Nomenclature χ a = heading angle, deg χ k = course angle, deg χ e = track angle error, deg δ ec , δ ac = elevator, aileron control surface deflections, deg * Research Associate, Control and Simulation Division, Faculty of Aerospace Engineering, Delft University of Technology. Kluyverweg 1, 2629 HS Delft, The Netherlands. E-mail: c.borst@lr.tudelft.nl † Assistant Professor, Control and Simulation Division, Faculty of Aerospace Engineering, Delft University of Technology. Kluyverweg 1, 2629 HS Delft, The Netherlands. Member AiAA. E-mail: m.mulder@lr.tudelft.nl ‡ Associate Professor, Control and Simulation Division, Faculty of Aerospace Engineering, Delft Uni- versity of Technology. Kluyverweg 1, 2629 HS Delft, The Netherlands. Member AiAA. E-mail: m.m.vanpaassen@lr.tudelft.nl § Professor, Chairman of the Control and Simulation Division, Faculty of Aerospace Engineering, Delft University of Technology. Kluyverweg 1, 2629 HS Delft, The Netherlands. Member AiAA. E-mail: j.a.mulder@lr.tudelft.nl 1 of 29 Published in: JOURNAL OF GUIDANCE, CONTROL, AND DYNAMICS Vol. 29, No. 4, July–August 2006 pp. 780-791