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An Approximate Analysis of Wing Unsteady Aerodynamics
Report Number: AFFDL TR 79-3046
Author(s): William R. Wells
Corporate Author: Wright State University
Laboratory: Air Force Flight Dynamics Laboratory
Publication Date: 5/1/1979
Pages: 43
Contract: F33615-76-C-3145
Project: 2307
AD Number: ADA079322
Photo Enhancement: Not Needed
Abstract Text:
A brief review of the unsteady aerodynamics in lifting surface theory is reported. For utility in design application, simplified but accurate analytical expressions were developed for generalized unsteady aerodynamics of wings of finite aspect ratio and sweep. This includes a means of calculating the unsteady lift load on the wing and tail surface of arbitrary shape and angle of attack variation. In addition, a formulation to include the indicial aerodynamics in the longitudinal equations of motion of the aircraft was performed. Sample numerical solutions to the longitudinal equations for a step input in elevator deflection are presented for the Navion aircraft. From these calculations, a noted difference in angle of attack and pitch rate response can be seen for the cases of unsteady and quasi-steady aerodynamics. The apparent increase in damping effects in the aircraft response due to the unsteady aerodynamics indicate that various design constraints might be relaxed somewhat if the unsteady aerodynamics is modeled properly.
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A Method for Assessing the Impact of Wake Vortices on USAF Operations
Report Number: AFFDL TR 79-3060
Author(s): G. Kurylowich
Corporate Author: Control Dynamics Branch
Laboratory: Air Force Flight Dynamics Laboratory
Publication Date: 7/1/1979
Pages: 110
Contract: Laboratory Research - No Contract
Project: 2403
Task: 240305
AD Number: ADA072967
Photo Enhancement: Complete
Notes: STINET reord has 'of USAF operations' instead of 'on USAF operations'
Abstract Text:
Experience as a consultant to the Safety Office at Norton AFB led to compiling the engineering tools presented so that this report can be used by engineering personnel to investigate future incidents/accidents and existing USAF operations that are impacted by the vortical wake hazard. The approach presented is amenable to easy hand computations. Mixed airplane/helicopter operations can be assessed, since the engineering tools to determine the location and strength of the rotor downwash field behind a helicopter are presented. Finally, a simplified mathematical model is given to represent this hazard for use in USAF simulators, to make pilots aware of the problems associated with operating in wake-contaminated airspace.
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Flying Qualities Design requirements for Sidestick Controllers
Report Number: AFFDL TR 79-3126
Author(s): G. Thomas Black; David J. Moorhouse
Corporate Author: Air Force Flight Dynamics Laboratory
Laboratory: Air Force Flight Dynamics Laboratory
Publication Date: 10/1/1979
Pages: 186
Contract: Laboratory Research - No Contract
Project: 2403
Task: 240305
AD Number: ADA085085
Photo Enhancement: Not Needed
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Influence of Pitching Moment Characteristics on Departure and Uncoordinated Roll Reversal Boundaries for Fighter Configurations
Report Number: AFFDL TR 79-3157
Author(s): W. Bihrle, Jr.; B. Barnhart
Corporate Author: Bihrle Applied Research, Inc.
Laboratory: Air Force Flight Dynamics Laboratory
Publication Date: 2/1/1980
Pages: 132
Contract: F33615-78-C-3600
Project: 2403
Task: 240305
AD Number: ADA082335
Photo Enhancement: Not Needed
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