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Wake analysis of drag components in gliding flight of a jackdaw (Corvus monedula) during moult

KleinHeerenbrink, Marco LU and Hedenström, Anders LU (2017) In Interface Focus 7(1).
Abstract

To maintain the quality of the feathers, birds regularly undergo moult. It is widely accepted that moult affects flight performance, but the specific aerodynamic consequences have received relatively little attention. Here we measured the components of aerodynamic drag from the wake behind a gliding jackdaw (Corvus monedula) at different stages of its natural wing moult. We found that span efficiency was reduced (lift induced drag increased) and the wing profile drag coefficient was increased. Both effects best correlated with the corresponding reduction in spanwise camber. The negative effects are partially mitigated by adjustments of wing posture to minimize gaps in the wing, and by weight loss to reduce wing loading. By studying the... (More)

To maintain the quality of the feathers, birds regularly undergo moult. It is widely accepted that moult affects flight performance, but the specific aerodynamic consequences have received relatively little attention. Here we measured the components of aerodynamic drag from the wake behind a gliding jackdaw (Corvus monedula) at different stages of its natural wing moult. We found that span efficiency was reduced (lift induced drag increased) and the wing profile drag coefficient was increased. Both effects best correlated with the corresponding reduction in spanwise camber. The negative effects are partially mitigated by adjustments of wing posture to minimize gaps in the wing, and by weight loss to reduce wing loading. By studying the aerodynamic consequences of moult, we can refine our understanding of the emergence of various moulting strategies found among birds.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aerodynamic efficiency, Animal flight, Gliding, Moult, Wind tunnel
in
Interface Focus
volume
7
issue
1
publisher
Royal Society Publishing
external identifiers
  • scopus:85007079704
  • wos:000391694100006
ISSN
2042-8898
DOI
10.1098/rsfs.2016.0081
language
English
LU publication?
yes
id
5099d1ec-8faf-41a5-a192-e347be1e5cd3
date added to LUP
2017-01-27 14:15:59
date last changed
2018-01-07 11:47:06
@article{5099d1ec-8faf-41a5-a192-e347be1e5cd3,
  abstract     = {<p>To maintain the quality of the feathers, birds regularly undergo moult. It is widely accepted that moult affects flight performance, but the specific aerodynamic consequences have received relatively little attention. Here we measured the components of aerodynamic drag from the wake behind a gliding jackdaw (Corvus monedula) at different stages of its natural wing moult. We found that span efficiency was reduced (lift induced drag increased) and the wing profile drag coefficient was increased. Both effects best correlated with the corresponding reduction in spanwise camber. The negative effects are partially mitigated by adjustments of wing posture to minimize gaps in the wing, and by weight loss to reduce wing loading. By studying the aerodynamic consequences of moult, we can refine our understanding of the emergence of various moulting strategies found among birds.</p>},
  articleno    = {20160081},
  author       = {KleinHeerenbrink, Marco and Hedenström, Anders},
  issn         = {2042-8898},
  keyword      = {Aerodynamic efficiency,Animal flight,Gliding,Moult,Wind tunnel},
  language     = {eng},
  month        = {02},
  number       = {1},
  publisher    = {Royal Society Publishing},
  series       = {Interface Focus},
  title        = {Wake analysis of drag components in gliding flight of a jackdaw (Corvus monedula) during moult},
  url          = {http://dx.doi.org/10.1098/rsfs.2016.0081},
  volume       = {7},
  year         = {2017},
}