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Figure 1


Fig. 1. Rear view of the flying swift showing the method of digitizing from high-speed films. The shoulder joint (p1) and wingtip (p2) are located and with the measurements of distance in the horizontal ({Delta}y) and vertical ({Delta}z) direction between these, the stroke angle ({theta}) can be calculated. The peak-to-peak amplitude, 2A, is the distance between the wingtip at the upper and lower turning point.