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Elytra boost lift, but reduce aerodynamic efficiency in flying beetles.

Author:
  • Christoffer Johansson
  • Sophia Engel
  • Emily Baird
  • Marie Dacke
  • Florian Muijres
  • Anders Hedenström
Publishing year: 2012
Language: English
Pages: 2745-2748
Publication/Series: Journal of the Royal Society Interface
Volume: 9
Issue: 75
Document type: Journal article
Publisher: The Royal Society of Canada

Abstract english

Flying insects typically possess two pairs of wings. In beetles, the front pair has evolved into short, hardened structures, the elytra, which protect the second pair of wings and the abdomen. This allows beetles to exploit habitats that would otherwise cause damage to the wings and body. Many beetles fly with the elytra extended, suggesting that they influence aerodynamic performance, but little is known about their role in flight. Using quantitative measurements of the beetle's wake, we show that the presence of the elytra increases vertical force production by approximately 40 per cent, indicating that they contribute to weight support. The wing-elytra combination creates a complex wake compared with previously studied animal wakes. At mid-downstroke, multiple vortices are visible behind each wing. These include a wingtip and an elytron vortex with the same sense of rotation, a body vortex and an additional vortex of the opposite sense of rotation. This latter vortex reflects a negative interaction between the wing and the elytron, resulting in a single wing span efficiency of approximately 0.77 at mid downstroke. This is lower than that found in birds and bats, suggesting that the extra weight support of the elytra comes at the price of reduced efficiency.

Keywords

  • Zoology
  • Biological Sciences
  • beetles
  • flight
  • aerodynamics

Other

Published
  • CAnMove
  • ISSN: 1742-5662
Marie Dacke
E-mail: marie [dot] dacke [at] biol [dot] lu [dot] se

Professor

Functional zoology

+46 46 222 93 36

B-B337

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