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Fig. 11. Horizontal body angle (HBA) and body angle of attack vs
time in the shallowing glide phase of one trajectory. The videocameras were
stationed lower on the tower to record the end of the trajectory only; as such
an arbitrary time was assigned to the beginning of the sequence. A. Anterior
HBA (filled circles) was relatively constant around 0°, meaning that the
anterior body was oriented approximately parallel with the ground. The
posterior HBA (unfilled circles) cycled to greater than 60°, indicating
that the posterior body swung below the horizontal. B. The pattern of body
angle of attack is similar to that of HBA. However, because the glide angle
was decreasing throughout this sequence, both anterior and posterior body
angles of attack declined relative to HBA. Only the anterior body angle of
attack, which changed from about 40° to 20° during the sequence, is a
good proxy for true angle of attack. (M=16 g, SVL=54 cm.)
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