Some observations on the mechanism of aircraft wing rock

Control of Unsteady Aerodynamic Forces

“…The phenomenon of wing rock has been observed during flights of the aircraft with a delta wing platform marked by a sustained large amplitude oscillatory motion (Hwang and Pi 1979). A time history of the normal force and roll angle of an 800 delta wing tested in the wind tunnel is shown in Fig.…”

Transonic Free-To-Roll Analysis of the F/A-18E and F-35 Configurations

“…The FTR technique has been used for many decades to address the low-speed problems at a number of test facilities. Application of FTR in the transonic regime has been much more limited but some testing was performed in Russia at the Sibnia Aerodynamic Research and Development Division 2 and in a semi-free-to-roll test conducted by Northrop and NASA Ames for the F-5A 3 . More recently the NASA/Navy/Air Force Abrupt Wing Stall (AWS) Program used the technique to assess uncommanded lateral activity on four military aircraft.…”