In parallel with a recent experimental study of the use of slotted tunnel liners with variable perforated screens to give interference-free aerodynamic damping derivatives, the corresponding problem is considered theoretically. ...
Summary. Experiment has already shown that the aerodynamic damping on half-span models in pitching oscillation is subject to interference effects that may exceed 30 per cent in slotted-wall tunnels at subsonic speeds. An ...
The vortex drag of a lifting surface depends only on its spanwise loading and is usually calculated therefrom. Deflection of a part-span flap gives a theoretical spanwise loading that can only be obtained by numerical ...