论文信息 - Effect of Lift-to-Drag Ratio in Pilot Rating of the HL-20 Landing Task

Effect of Lift-to-Drag Ratio in Pilot Rating of the HL-20 Landing Task

A man-in-the-loo p simulation study of the handling qualities of the HL-20 lifting-body vehicle was made in a fixed-base simulation cockpit at NASA Langley Research Center. The purpose of the study was to identify and substantiate opportunities for improving the original design of the vehicle from a handling qualities and landing performance perspective. Using preliminary wind-tunnel data, a subsonic aerodynamic model of the HL-20 was developed. This model was adequate to simulate the last 75-90 s of the approach and landing. A simple flight-control system was designed and implemented. Using this aerodynamic model as a baseline, visual approaches and landings were made at several vehicle lift-to-drag ratios. Pilots rated the handling characteristics of each configuration using a conventional numerical pilot-rating scale. Results from the study showed a high degree of correlation between the lift-to-drag ratio and pilot rating. Level 1 pilot ratings were obtained when the L/D ratio was approximately 3.8 or higher.

Melvin L. Bailey | Robert A. Rivers | E. B. Jackson

[1] J. Gentry. Lifting body flight test , 1968 .

[2] Gene J. Matranga,et al. Approach and Landing Investigation at Lift-Drag Ratios of 2 to 4 Utilizing a Straight-Wing Fighter Airplane , 1959 .

[3] R. W. Kempel,et al. Flight evaluation of the M2-F3 lifting body handling qualities at Mach numbers from 0.30 to 1.61 , 1974 .

[4] Christopher J Nagy,et al. Handling Qualities and Stability Derivatives of the X-24B Research Aircraft. , 1976 .

[5] Kelli F. Willshire,et al. Human factors evaluation of the HL-20 full-scale model , 1993 .

[6] Christopher I. Cruz,et al. Aerodynamic characteristics of the HL-20 , 1993 .

[7] G. P. Layton. Summary of primary results of the lifting body program , 1970 .

[8] Howard W. Stone,et al. 21st century space transportation system design approach - HL-20 personnel launch system , 1993 .

[9] George M. Ware,et al. Aerodynamic characteristics of the HL-20 and HL-20A lifting-body configurations , 1991 .

[10] George E. Cooper,et al. The use of pilot rating in the evaluation of aircraft handling qualities , 1969 .

[11] R. W. Kempel,et al. Assessment of lifting body vehicle handling qualities , 1971 .

[12] Richard W. Powell,et al. Utilization of simulation tools in the HL-20 conceptual design process. [passenger-carrying lifting body portion of Personnel Launch System] , 1991 .