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Fig. 20. Mean force vector and resultant directional forces and moments. (A)
Schematic illustrating the difference in mean force vector during the
downstroke between modes. While force magnitude is similarly modulated within
each mode, the mean forces can be slightly lower during Mode 1. Correlation
between downstroke deviation and downstroke (B) mean force magnitude and (C)
mean force inclination for Mode 2 (gray points; black line regression) and
Mode 1 (pink points; red line). Correlation between downstroke deviation and
downstroke (D) mean lift and (E) mean roll for Mode 2 (blue points; black
line) and Mode 1 (pink points; red line). (F) Schematic illustrating the
difference in mean force vector during the upstroke between modes. While force
inclination is similarly modulated within each mode (not shown), the mean
force magnitudes are much lower during Mode 1. (G) Correlation between
downstroke deviation and upstroke mean force magnitude. (H) Correlation
between dorsal amplitude and upstroke mean force inclination. Correlation
between downstroke deviation and upstroke (I) mean thrust and (J) mean yaw for
Mode 2 (green points; black line) and Mode 1 (pink points; red line).