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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Energy saving of aerial roosting Swifts by dynamic flap-gliding flight (2017)
Auteurs :	Gottfried Sachs, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (158(4) 2017/10/01)
Article en page(s) :	943-953
Langues:	Anglais
Résumé :	A modelling approach is presented for describing the unique flight mode of aerial roosting Swifts. With reference to measurement results, a mathematical model of this flight mode is developed that describes the energy state of the bird and, in an expanded version, allows for unsteady motion characteristics caused by brief force impulses associated with short flapping and gliding phases. Because of these unsteady effects, the flight mode is here termed ‘dynamic flap-gliding flight’. Results are presented on the mechanical power output, which is the relevant performance quantity for the energy cost of aerial roosting Swifts. It is shown that dynamic flap-gliding flight yields a significant energy saving when compared with the best continuous flapping flight. The flapping ratio has a considerable effect, with the result that the energy saving is the higher the smaller the flapping ratio. Furthermore, the duration of the flap-gliding cycle, which is varied by aerial roosting Swifts in a wide range, has only a minor effect. Introducing an appropriate non-dimensionalization of the governing relations, results which are less sensitive to uncertainties in model parameters are obtained.
En ligne :	https://link.springer.com/article/10.1007/s10336-017-1447-6

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