11/24/2023 0 Comments Assimilis rose breasted cockatooOur estimates of inertial reorientation were statistically significant predictors of the measured reorientation within wingbeats ( r 2 from 0.2 to 0.37, P<0.0005). Non-dimensional roll damping coefficients of approximately –1.5,2–6 times greater than those typical of airplane flight dynamics(approximately –0.45), were required to bring our estimates of reorientation due to aerodynamic torque back into conjunction with the measured changes in orientation. The estimated torque from the model was a significant predictor of roll acceleration ( r 2=0.55, P<0.00001), but greatly overestimated roll magnitude when applied with no roll damping. The blade-element model successfully predicted weight support(predicted was 88☑7% of observed, N=6) and centripetal force(predicted was 79☒9% of observed, N=6) for the maneuvering cockatoos and provided a reasonable estimate of mechanical power. Using three-dimensional kinematics recorded from six cockatoos making a 90° turn in a flight corridor, we developed predictions of inertial and aerodynamic reorientation from estimates of wing moments of inertia and flapping arcs, and a blade-element aerodynamic model. We found evidence that both these modes play important roles in the low speed turning flight of the rose-breasted cockatoo Eolophus roseicapillus. The reconfigurable, flapping wings of birds allow for both inertial and aerodynamic modes of reorientation.
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