Advanced

Bat flight generates complex aerodynamic tracks

Hedenström, Anders LU ; Johansson, Christoffer LU ; Wolf, Marta LU ; von Busse, R; Winter, Y and Spedding, G R (2007) In Science 316(5826). p.894-897
Abstract
The flapping flight of animals generates an aerodynamic footprint as a time-varying vortex wake in which the rate of momentum change represents the aerodynamic force. We showed that the wakes of a small bat species differ from those of birds in some important respects. In our bats, each wing generated its own vortex loop. Also, at moderate and high flight speeds, the circulation on the outer ( hand) wing and the arm wing differed in sign during the upstroke, resulting in negative lift on the hand wing and positive lift on the arm wing. Our interpretations of the unsteady aerodynamic performance and function of membranous-winged, flapping flight should change modeling strategies for the study of equivalent natural and engineered flying... (More)
The flapping flight of animals generates an aerodynamic footprint as a time-varying vortex wake in which the rate of momentum change represents the aerodynamic force. We showed that the wakes of a small bat species differ from those of birds in some important respects. In our bats, each wing generated its own vortex loop. Also, at moderate and high flight speeds, the circulation on the outer ( hand) wing and the arm wing differed in sign during the upstroke, resulting in negative lift on the hand wing and positive lift on the arm wing. Our interpretations of the unsteady aerodynamic performance and function of membranous-winged, flapping flight should change modeling strategies for the study of equivalent natural and engineered flying devices. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Science
volume
316
issue
5826
pages
894 - 897
publisher
The American Association for the Advancement of Science
external identifiers
  • wos:000246369800039
  • scopus:34248587767
ISSN
1095-9203
DOI
10.1126/science.1142281
language
English
LU publication?
yes
id
7f7e473b-b1d4-45cf-a057-bc3ff9f7dc4e (old id 168611)
date added to LUP
2007-07-03 11:56:42
date last changed
2017-10-22 04:43:55
@article{7f7e473b-b1d4-45cf-a057-bc3ff9f7dc4e,
  abstract     = {The flapping flight of animals generates an aerodynamic footprint as a time-varying vortex wake in which the rate of momentum change represents the aerodynamic force. We showed that the wakes of a small bat species differ from those of birds in some important respects. In our bats, each wing generated its own vortex loop. Also, at moderate and high flight speeds, the circulation on the outer ( hand) wing and the arm wing differed in sign during the upstroke, resulting in negative lift on the hand wing and positive lift on the arm wing. Our interpretations of the unsteady aerodynamic performance and function of membranous-winged, flapping flight should change modeling strategies for the study of equivalent natural and engineered flying devices.},
  author       = {Hedenström, Anders and Johansson, Christoffer and Wolf, Marta and von Busse, R and Winter, Y and Spedding, G R},
  issn         = {1095-9203},
  language     = {eng},
  number       = {5826},
  pages        = {894--897},
  publisher    = {The American Association for the Advancement of Science},
  series       = {Science},
  title        = {Bat flight generates complex aerodynamic tracks},
  url          = {http://dx.doi.org/10.1126/science.1142281},
  volume       = {316},
  year         = {2007},
}