Advanced

Multi-cored vortices support function of slotted wing tips of birds in gliding and flapping flight

KleinHeerenbrink, Marco LU ; Hedenström, Anders LU and Johansson, Christoffer LU (2017) In Journal of the Royal Society, Interface 14(130).
Abstract
Slotted wing tips of birds are commonly considered an adaptation to improve soaring performance, despite their presence in species that neither soar nor glide. We used particle image velocimetry to measure the airflow around the slotted wing tip of a jackdaw (Corvus monedula) as well as in its wake during unrestrained flight in a wind tunnel. The separated primary feathers produce individual wakes, confirming a multi-slotted function, in both gliding and flapping flight. The resulting multi-cored wingtip vortex represents a spreading of vorticity, which has previously been suggested as indicative of increased aerodynamic efficiency. Considering benefits of the slotted wing tips that are specific to flapping flight combined with the wide... (More)
Slotted wing tips of birds are commonly considered an adaptation to improve soaring performance, despite their presence in species that neither soar nor glide. We used particle image velocimetry to measure the airflow around the slotted wing tip of a jackdaw (Corvus monedula) as well as in its wake during unrestrained flight in a wind tunnel. The separated primary feathers produce individual wakes, confirming a multi-slotted function, in both gliding and flapping flight. The resulting multi-cored wingtip vortex represents a spreading of vorticity, which has previously been suggested as indicative of increased aerodynamic efficiency. Considering benefits of the slotted wing tips that are specific to flapping flight combined with the wide phylogenetic occurrence of this configuration, we propose the hypothesis that slotted wings evolved initially to improve performance in powered flight. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
animal flight, slotted wing tips, separated outer primary feathers, flight efficiency, jackdaw, Corvus monedula, wind tunnel
in
Journal of the Royal Society, Interface
volume
14
issue
130
publisher
Royal Society
external identifiers
  • scopus:85020740955
  • wos:000402534200021
DOI
10.1098/rsif.2017.0099
language
English
LU publication?
yes
id
aa5fca65-ebbe-44a9-bed8-8c0247586bf2
date added to LUP
2017-05-25 11:22:10
date last changed
2018-01-28 04:30:04
@article{aa5fca65-ebbe-44a9-bed8-8c0247586bf2,
  abstract     = {Slotted wing tips of birds are commonly considered an adaptation to improve soaring performance, despite their presence in species that neither soar nor glide. We used particle image velocimetry to measure the airflow around the slotted wing tip of a jackdaw (Corvus monedula) as well as in its wake during unrestrained flight in a wind tunnel. The separated primary feathers produce individual wakes, confirming a multi-slotted function, in both gliding and flapping flight. The resulting multi-cored wingtip vortex represents a spreading of vorticity, which has previously been suggested as indicative of increased aerodynamic efficiency. Considering benefits of the slotted wing tips that are specific to flapping flight combined with the wide phylogenetic occurrence of this configuration, we propose the hypothesis that slotted wings evolved initially to improve performance in powered flight.},
  author       = {KleinHeerenbrink, Marco and Hedenström, Anders and Johansson, Christoffer},
  keyword      = {animal flight,slotted wing tips,separated outer primary feathers,flight efficiency,jackdaw,Corvus monedula,wind tunnel},
  language     = {eng},
  month        = {05},
  number       = {130},
  publisher    = {Royal Society},
  series       = {Journal of the Royal Society, Interface},
  title        = {Multi-cored vortices support function of slotted wing tips of birds in gliding and flapping flight},
  url          = {http://dx.doi.org/10.1098/rsif.2017.0099},
  volume       = {14},
  year         = {2017},
}