Normal direction deflections of an elastic wing are measured by detecting an image on a wind tunnel wall reflecting from a laser light target embedded on a wing and processing the video signal obtained. This measurement system allows to measure easily and precisely the elastic deformation of the wing. Computing the pressure distribution on the wing surface by 3-D full potential USTF3 code, taking account of the mean elastic deflection of the wing measured above, cleared the elastic deformation effects on the transonic aerodynamics. Dynamic elastic deformation of the wing during the flutter is also acquired by processing the high-speed video data which shows that the phase difference between bending and torsion component is changing spanwise; at the outboard wing station, a torsion component leads a bending which promotes flutter, while at the middle part, a torsion and a bending component go in phase which leads to suppress the flutter.
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