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Aerodynamics of manoeuvring flight in brown long-eared bats (Plecotus auritus)

Henningsson, Per LU ; Jakobsen, Lasse LU and Hedenström, Anders LU (2018) In Journal of the Royal Society, Interface 15(148).
Abstract

In this study, we explicitly examine the aerodynamics of manoeuvring flight in animals. We studied brown long-eared bats flying in a wind tunnel while performing basic sideways manoeuvres. We used particle image velocimetry in combination with high-speed filming to link aerodynamics and kinematics to understand the mechanistic basis of manoeuvres. We predicted that the bats would primarily use the downstroke to generate the asymmetries for the manoeuvre since it has been shown previously that the majority of forces are generated during this phase of the wingbeat. We found instead that the bats more often used the upstroke than they used the downstroke for this. We also found that the bats used both drag/thrust-based and lift-based... (More)

In this study, we explicitly examine the aerodynamics of manoeuvring flight in animals. We studied brown long-eared bats flying in a wind tunnel while performing basic sideways manoeuvres. We used particle image velocimetry in combination with high-speed filming to link aerodynamics and kinematics to understand the mechanistic basis of manoeuvres. We predicted that the bats would primarily use the downstroke to generate the asymmetries for the manoeuvre since it has been shown previously that the majority of forces are generated during this phase of the wingbeat. We found instead that the bats more often used the upstroke than they used the downstroke for this. We also found that the bats used both drag/thrust-based and lift-based asymmetries to perform the manoeuvre and that they even frequently switch between these within the course of a manoeuvre. We conclude that the bats used three main modes: lift asymmetries during downstroke, thrust/drag asymmetries during downstroke and thrust/drag asymmetries during upstroke. For future studies, we hypothesize that lift asymmetries are used for fast turns and thrust/drag for slow turns and that the choice between up- and downstroke depends on the timing of when the bat needs to generate asymmetries.

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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
aerodynamics, bats, kinematics, manoeuvring flight, particle image velocimetry
in
Journal of the Royal Society, Interface
volume
15
issue
148
publisher
The Royal Society of Canada
external identifiers
  • pmid:30404906
  • scopus:85056419722
ISSN
1742-5662
DOI
10.1098/rsif.2018.0441
project
Centre for Animal Movement Research
language
English
LU publication?
yes
id
fe24121b-9620-4cfd-9075-63d2c17cd21b
date added to LUP
2018-11-22 09:07:18
date last changed
2020-09-09 05:15:08
@article{fe24121b-9620-4cfd-9075-63d2c17cd21b,
  abstract     = {<p>In this study, we explicitly examine the aerodynamics of manoeuvring flight in animals. We studied brown long-eared bats flying in a wind tunnel while performing basic sideways manoeuvres. We used particle image velocimetry in combination with high-speed filming to link aerodynamics and kinematics to understand the mechanistic basis of manoeuvres. We predicted that the bats would primarily use the downstroke to generate the asymmetries for the manoeuvre since it has been shown previously that the majority of forces are generated during this phase of the wingbeat. We found instead that the bats more often used the upstroke than they used the downstroke for this. We also found that the bats used both drag/thrust-based and lift-based asymmetries to perform the manoeuvre and that they even frequently switch between these within the course of a manoeuvre. We conclude that the bats used three main modes: lift asymmetries during downstroke, thrust/drag asymmetries during downstroke and thrust/drag asymmetries during upstroke. For future studies, we hypothesize that lift asymmetries are used for fast turns and thrust/drag for slow turns and that the choice between up- and downstroke depends on the timing of when the bat needs to generate asymmetries.</p>},
  author       = {Henningsson, Per and Jakobsen, Lasse and Hedenström, Anders},
  issn         = {1742-5662},
  language     = {eng},
  month        = {11},
  number       = {148},
  publisher    = {The Royal Society of Canada},
  series       = {Journal of the Royal Society, Interface},
  title        = {Aerodynamics of manoeuvring flight in brown long-eared bats (Plecotus auritus)},
  url          = {http://dx.doi.org/10.1098/rsif.2018.0441},
  doi          = {10.1098/rsif.2018.0441},
  volume       = {15},
  year         = {2018},
}