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Fig. 4. Vertical force augmentation due to dorsal wingwing interaction in 17
gross kinematic patterns. (A) Augmentation of vertical force (two-wing minus
one-wing performance) plotted as a function of mean vertical force produced
throughout the stroke cycle, (B) vertical force augmentation plotted against
mean vertical force coefficient based on a conventional quasi-steady approach,
(C) vertical force augmentation plotted against the relative contribution of
wing rotation (rotational effect) and wake capture to quasi-steady
translational vertical force, and (D) change in orientation of total force
vector (pictogram) due to dorsal clap-and-fling wingwing interaction.
Letters plotted on or close to data points correspond to the letters of the
kinematic patterns shown in Fig.
2.