Simulation Evaluation of Transition and Hover Flying Qualities of a Mixed-Flow, Remote-Lift Stovl Aircraft

Document Number: 892284

Date Published: September 1989

Author(s):
James A. Franklin - NASA Ames Research Center
Michael W. Stortz - NASA Ames Research Center
Shawn A. Engelland - NASA Ames Research Center
Gordon H. Hardy - NASA Ames Research Center
James L. Martin - NASA Ames Research Center
Ronald M. Gerdes - NASA Ames Research Center

Abstract:
Using a generalized simulation model developed for piloted evaluations of short take-off/vertical landing aircraft, an initial fixed-base simulation of a mixed-flow, remote-lift configuration has been completed. Objectives of the simulation were to evaluate the integration of the aircraft's flight and propulsion controls to achieve good flying qualities throughout the low-speed flight envelope; to determine control power used during transition, hover, and vertical landing; and to evaluate the transition flight envelope considering the influence of thrust deflection of the remote-lift component. Pilots' evaluations indicated that Level 1 flying qualities could be achieved for deceleration to hover in instrument conditions, for airfield landings, and for recovery to a small ship when attitude and velocity stabilization and command augmentation control modes were provided. Level 2 flying qualities were obtained for these same tasks when only the attitude command mode was used, leaving the pilot to perform the task of thrust management required to control the flight-path and speed in transition and the horizontal and vertical translational velocities in hover. Thrust margins were defined for vertical landing as a function of ground effect and hot- gas ingestion. Finally, the results provide a general view of the acceptable transition corridor, expressed in terms of minimum level flight acceleration, including the effects of thrust-vectoring efficiency and excess thrust

File Size: 683K
Product Status: In Stock

Purchase more technical papers and save! With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay. Learn more >