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Powered-gliding/climbing flight performed by bats for saving fuel.

Gottfried Sachs1

  • 1TUM Senior Excellence Faculty, Technical University of Munich, Arcisstraße 21, 80333 München, Germany.

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Summary

Bats utilize continual altitude changes during flight, a behavior termed powered-gliding/climbing flight. This method significantly saves fuel by reducing aerodynamic drag compared to constant-altitude flight.

Keywords:
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Area of Science:

  • Animal flight dynamics
  • Bioenergetics
  • Aerodynamics

Background:

  • Bats exhibit flights with continuous altitude changes, a behavior not fully understood.
  • Existing literature indicates a need for further research into the reasons behind these altitude variations.

Purpose of the Study:

  • To explain the functional significance of altitude-changing flights in bats.
  • To demonstrate that these flights represent a fuel-saving strategy.

Main Methods:

  • Analysis of flight measurement data to study altitude changes.
  • Development of a flight mechanics model for powered-gliding/climbing flight.
  • Investigation of aerodynamic drag reduction mechanisms.

Main Results:

  • Descents in altitude are powered by wing flapping, creating a powered glide.
  • This powered-gliding/climbing flight reduces aerodynamic drag.
  • The flight mechanics model confirms significant fuel savings compared to constant-altitude flight.

Conclusions:

  • Bats employ a powered-gliding/climbing flight mode, extending known flap-gliding techniques.
  • This flight strategy offers substantial fuel economy by minimizing aerodynamic drag.
  • The study provides a physical explanation and model for this energy-efficient flight behavior.