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
8 pages
Report
No indication
English
Aerodynamics , Aircraft , Flight testing , Fighter aircraft , Strakes , Center of gravity , Roll , Symposia , Pitch(Motion) , Static loads , Angle of attack , Configurations , Inflight , Statics , Workshops , Leading edge flaps , Free-to-roll investigation , 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
|