NDLI: Kinematics of flight and the relationship to the vortex wake of a Pallas' long tongued bat (Glossophaga soricina).

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Kinematics of flight and the relationship to the vortex wake of a Pallas' long tongued bat (Glossophaga soricina).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wolf, Marta Johansson, L. Christoffer Von Busse, Rhea Winter, York Hedenström, Anders
Description	Country affiliation: Sweden Author Affiliation: Wolf M ( Department of Biology, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden.)
Abstract	To obtain a full understanding of the aerodynamics of animal flight, the movement of the wings, the kinematics, needs to be connected to the wake left behind the animal. Here the detailed 3D wingbeat kinematics of bats, Glossophaga soricina, flying in a wind tunnel over a range of flight speeds (1-7 m s(-1)) was determined from high-speed video. The results were compared with the wake geometry and quantitative wake measurements obtained simultaneously to the kinematics. The wingbeat kinematics varied gradually with flight speed and reflected the changes observed in the wake of the bats. In particular, several of the kinematic parameters reflected the differences in the function of the upstroke at low and high flight speeds. At lower flight speeds the bats use a pitch-up rotation to produce a backward flick which creates thrust and some weight support. At higher speeds this mechanism disappears and the upstroke generates weight support but no thrust. This is reflected by the changes in e.g. angle of attack, span ratio, camber and downstroke ratio. We also determined how different parameters vary throughout a wingbeat over the flight speeds studied. Both the camber and the angle of attack varied over the wingbeat differently at different speeds, suggesting active control of these parameters to adjust to the changing aerodynamic conditions. This study of the kinematics strongly indicates that the flight of bats is governed by an unsteady high-lift mechanism at low flight speeds and points to differences between birds and bats.
File Format	HTM / HTML
ISSN	00220949
e-ISSN	14779145
Journal	Journal of Experimental Biology
Issue Number	Pt 12
Volume Number	213
Language	English
Publisher	The Company of Biologists
Publisher Date	2010-06-15
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Discipline Biology Chiroptera Physiology Flight, Animal Animals Biomechanical Phenomena Predatory Behavior Anatomy & Histology Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Aquatic Science Molecular Biology Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Insect Science

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