Wingbeat time and the scaling of passive rotational damping in flapping flight

Tyson L. Hedrick, Bo Cheng, Xinyan Deng

Research output: Contribution to journalArticlepeer-review

235 Scopus citations


Flying animals exhibit remarkable capabilities for both generating maneuvers and stabilizing their course and orientation after perturbation. Here we show that flapping fliers ranging in size from fruit flies to large birds benefit from substantial damping of angular velocity through a passive mechanism termed flapping counter-torque (FCT). Our FCT model predicts that isometrically scaled animals experience similar damping on a per-wingbeat time scale, resulting in similar turning dynamics in wingbeat time regardless of body size. The model also shows how animals may simultaneously specialize in both maneuverability and stability (at the cost of efficiency) and provides a framework for linking morphology, wing kinematics, maneuverability, and flight dynamics across a wide range of flying animals spanning insects, bats, and birds.

Original languageEnglish (US)
Pages (from-to)252-255
Number of pages4
Issue number5924
StatePublished - Apr 10 2009

All Science Journal Classification (ASJC) codes

  • General


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