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Indirect estimates of wing-propulsion forces in horizontally diving Atlantic puffins (Fratercula arctica L.)

Johansson, Christoffer LU (2003) In Canadian Journal of Zoology 81(5). p.816-822
Abstract
Instantaneous force production in wing-propelled diving Atlantic puffins (Fratercula arctica) was investigated using four birds for which instantaneous estimates of velocity and acceleration of the body were made. The quasi-steady resultant force acting on the body in the sagittal plane was calculated using acceleration reaction coefficients, buoyancy estimates, and drag coefficients taken from the literature and calculated, using two different methods, from a video sequence of a puffin gliding (CDw = 0.021 and 0.026, respectively). The forces calculated from the motion of the body coincide well with the wing-beat cycle, with a forward- and upward-directed force produced by the wings during the downstroke and a forward- and... (More)
Instantaneous force production in wing-propelled diving Atlantic puffins (Fratercula arctica) was investigated using four birds for which instantaneous estimates of velocity and acceleration of the body were made. The quasi-steady resultant force acting on the body in the sagittal plane was calculated using acceleration reaction coefficients, buoyancy estimates, and drag coefficients taken from the literature and calculated, using two different methods, from a video sequence of a puffin gliding (CDw = 0.021 and 0.026, respectively). The forces calculated from the motion of the body coincide well with the wing-beat cycle, with a forward- and upward-directed force produced by the wings during the downstroke and a forward- and downward-directed force produced during the upstroke. The result suggests that a thrust force may also be produced during at least the lower-stroke reversal. This means either that there may exist some undescribed propulsive mechanism, possibly caused by an interaction of the wings beneath the body, or that the body drag coefficient may be overestimated. However, the body drag coefficient calculated in the study is close to the coefficients measured on dead birds. Furthermore, I conclude that the high reduced frequency (average 0.82) suggests a non-steady-state hydrodynamic mechanism of wing-propelled diving in puffins. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Canadian Journal of Zoology
volume
81
issue
5
pages
816 - 822
publisher
National Research Council Canada
external identifiers
  • scopus:0041569936
ISSN
1480-3283
DOI
10.1139/z03-058
language
English
LU publication?
no
id
83bdbccd-2bde-43c5-a7ce-18bb270d6828 (old id 951329)
date added to LUP
2008-01-24 16:00:00
date last changed
2018-05-29 09:21:42
@article{83bdbccd-2bde-43c5-a7ce-18bb270d6828,
  abstract     = {Instantaneous force production in wing-propelled diving Atlantic puffins (Fratercula arctica) was investigated using four birds for which instantaneous estimates of velocity and acceleration of the body were made. The quasi-steady resultant force acting on the body in the sagittal plane was calculated using acceleration reaction coefficients, buoyancy estimates, and drag coefficients taken from the literature and calculated, using two different methods, from a video sequence of a puffin gliding (CDw = 0.021 and 0.026, respectively). The forces calculated from the motion of the body coincide well with the wing-beat cycle, with a forward- and upward-directed force produced by the wings during the downstroke and a forward- and downward-directed force produced during the upstroke. The result suggests that a thrust force may also be produced during at least the lower-stroke reversal. This means either that there may exist some undescribed propulsive mechanism, possibly caused by an interaction of the wings beneath the body, or that the body drag coefficient may be overestimated. However, the body drag coefficient calculated in the study is close to the coefficients measured on dead birds. Furthermore, I conclude that the high reduced frequency (average 0.82) suggests a non-steady-state hydrodynamic mechanism of wing-propelled diving in puffins.},
  author       = {Johansson, Christoffer},
  issn         = {1480-3283},
  language     = {eng},
  number       = {5},
  pages        = {816--822},
  publisher    = {National Research Council Canada},
  series       = {Canadian Journal of Zoology},
  title        = {Indirect estimates of wing-propulsion forces in horizontally diving Atlantic puffins (Fratercula arctica L.)},
  url          = {http://dx.doi.org/10.1139/z03-058},
  volume       = {81},
  year         = {2003},
}