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Simulation Study of an Automatic Trim System for Reducing the Control Forces on a Light Twin After an Engine Failure
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English
Abstract
An automatic trim system for reducing the control forces after an engine failure on a light twin has been investigated on the Langley General Aviation Simulator. The system schedules open-loop trim tab deflections as a function of differential propeller slipstream dynamic pressure and freestream dynamic pressure. The system is described and the airplane-system static and dynamic characteristics are documented. Three NASA research pilots evaluated the effectiveness of the system for takeoff and landing maneuvers. A variety of off-nominal system characteristics were studied. The system was judged to be generally beneficial, providing a 2 to 3 point improvement in pilot rating for the tasks used in the evaluations.
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Citation
Stewart, E. and Brown, P., "Simulation Study of an Automatic Trim System for Reducing the Control Forces on a Light Twin After an Engine Failure," SAE Technical Paper 850913, 1985, https://doi.org/10.4271/850913.Also In
References
- Anonymous: Light Twin-Engine Aircraft Accidents Following Engine Failure, 1972-1976 (U.S.) National Transportation Safety Board Washington, D.C. December 13 1979
- Stewart, E. C. Moul, T. M. Brown, P. W. A Simulation Study of the Low-Speed Characteristics of a Light Twin with an Engine-Out AIAA Paper No. 83-2128 August 1983
- Hoh, Roger H. Mitchell, David G. Myers, Thomas T. Simulation Model of Cessna 402B NASA CR 152176 July 1978
- Frink, Marvin P. Shivers, James P. Smith, Charles C., Jr. A Wind Tunnel Investigation of Static Longitudinal and Lateral Characteristics of a Full-Scale Mock-Up of a Light Twin-Engine Airplane NASA TN D-6238 April 1971
- Vogeley, A. W. Hart, H. A. Circumferential Distribution of Propeller-Slipstream Total-Pressured Rise at One Radial Station of a Twin-Engine Transport Airplane NASA TN 3432 April 1955
- Foxworth, T. G. Martinsen, H. F. The Case Against Engine-Out Flight Training 24th Annual International Air Safety Seminar October 18-21 1971
- Roskam, Jan See, Michael J. The State of the Art of General Aviation Autopilots: Now and in the Future SAE Paper No. 810582 April 1981