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Leading-edge vortex improves lift in slow-flying bats.
Science. 2008 Feb 29; 319(5867):1250-3.Sci

Abstract

Staying aloft when hovering and flying slowly is demanding. According to quasi-steady-state aerodynamic theory, slow-flying vertebrates should not be able to generate enough lift to remain aloft. Therefore, unsteady aerodynamic mechanisms to enhance lift production have been proposed. Using digital particle image velocimetry, we showed that a small nectar-feeding bat is able to increase lift by as much as 40% using attached leading-edge vortices (LEVs) during slow forward flight, resulting in a maximum lift coefficient of 4.8. The airflow passing over the LEV reattaches behind the LEV smoothly to the wing, despite the exceptionally large local angles of attack and wing camber. Our results show that the use of unsteady aerodynamic mechanisms in flapping flight is not limited to insects but is also used by larger and heavier animals.

Authors+Show Affiliations

Department of Theoretical Ecology, Lund University, SE-223 62 Lund, Sweden.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18309085

Citation

Muijres, F T., et al. "Leading-edge Vortex Improves Lift in Slow-flying Bats." Science (New York, N.Y.), vol. 319, no. 5867, 2008, pp. 1250-3.
Muijres FT, Johansson LC, Barfield R, et al. Leading-edge vortex improves lift in slow-flying bats. Science. 2008;319(5867):1250-3.
Muijres, F. T., Johansson, L. C., Barfield, R., Wolf, M., Spedding, G. R., & Hedenström, A. (2008). Leading-edge vortex improves lift in slow-flying bats. Science (New York, N.Y.), 319(5867), 1250-3. https://doi.org/10.1126/science.1153019
Muijres FT, et al. Leading-edge Vortex Improves Lift in Slow-flying Bats. Science. 2008 Feb 29;319(5867):1250-3. PubMed PMID: 18309085.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Leading-edge vortex improves lift in slow-flying bats. AU - Muijres,F T, AU - Johansson,L C, AU - Barfield,R, AU - Wolf,M, AU - Spedding,G R, AU - Hedenström,A, PY - 2008/3/1/pubmed PY - 2008/3/14/medline PY - 2008/3/1/entrez SP - 1250 EP - 3 JF - Science (New York, N.Y.) JO - Science VL - 319 IS - 5867 N2 - Staying aloft when hovering and flying slowly is demanding. According to quasi-steady-state aerodynamic theory, slow-flying vertebrates should not be able to generate enough lift to remain aloft. Therefore, unsteady aerodynamic mechanisms to enhance lift production have been proposed. Using digital particle image velocimetry, we showed that a small nectar-feeding bat is able to increase lift by as much as 40% using attached leading-edge vortices (LEVs) during slow forward flight, resulting in a maximum lift coefficient of 4.8. The airflow passing over the LEV reattaches behind the LEV smoothly to the wing, despite the exceptionally large local angles of attack and wing camber. Our results show that the use of unsteady aerodynamic mechanisms in flapping flight is not limited to insects but is also used by larger and heavier animals. SN - 1095-9203 UR - https://www.unboundmedicine.com/medline/citation/18309085/Leading_edge_vortex_improves_lift_in_slow_flying_bats_ L2 - http://www.sciencemag.org/cgi/pmidlookup?view=long&pmid=18309085 DB - PRIME DP - Unbound Medicine ER -