A free-to-roll study of the low-speed lateral characteristics of the pre-production F/A-18E was conducted in the NASA Langley 12-Foot Low-Speed Tunnel. In developmental flight tests the F/A-18E unexpectedly experienced uncommanded lateral motions in the power approach configuration. The objective of this study was to determine the feasibility of using the free-to-roll technique for the detection of uncommanded lateral motions for the pre-production F/A-18E in the power approach configuration. The data revealed that this technique in conjunction with static data revealed insight into the cause of the lateral motions. The free-to-roll technique identified uncommanded lateral motions at the same angle-of-attack range as experienced in flight tests. The cause of the uncommanded lateral motions was unsteady asymmetric wing stall. The paper also shows that free-to-roll data or static force and moment data alone are not enough to accurately capture the potential for an aircraft to experience uncommanded lateral motion.
Free-to-Roll Investigation of Uncommanded Lateral Motions for an Aircraft with Vented Strakes
2005
12 pages
Report
No indication
English
Aerodynamics , Aircraft , Flight testing , Fighter aircraft , Strakes , Center of gravity , Roll , Pitch(Motion) , Static loads , Angle of attack , Configurations , Inflight , Statistics , Leading edge flaps , Vented strakes , Uncommanded lateral motions , Angle of sideslip , Horizontal tails , Leading edge extension , Lift coefficients , Pitch angles , Trailing edge flaps , Vertical tails
Free-to-Roll Investigation of Uncommanded Lateral Motions for an Aircraft with Vented Strakes
British Library Conference Proceedings | 2005
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