Fig. 4. Because it free-falls during the ballistic phase, a bounding bird has to pull up during the flapping phase, effectively increasing gravity (g) by a factor 1/q, where q is the power fraction (the proportion of time spent flapping).
Fig. 4. Because it free-falls during the ballistic phase, a bounding bird has to pull up during the flapping phase, effectively increasing gravity (g) by a factor 1/q, where q is the power fraction (the proportion of time spent flapping).