spinning rotation of ash and tulip tree samaras

Ash and tulip tree samaras rotate on their long axes as they fall, as well as spin around like maple samaras. They descend faster than would maple samaras of the same size and weight and much faster than would zanonia samaras, but they are very stable, which may explain their evolutionary success.

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Bibliographische Detailangaben
Veröffentlicht in:	Science (American Association for the Advancement of Science) 1977-08, Vol.197 (4304), p.691-692
1. Verfasser:	McCutchen, C.W
Format:	Artikel
Sprache:	eng
Schlagworte:	Aerodynamic forces Aircraft wings Drag coefficient Fraxinus excelsior Geometric shapes Gliding Kinetics Reynolds number Rotation Samaras Symmetry
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Beschreibung
Zusammenfassung:	Ash and tulip tree samaras rotate on their long axes as they fall, as well as spin around like maple samaras. They descend faster than would maple samaras of the same size and weight and much faster than would zanonia samaras, but they are very stable, which may explain their evolutionary success.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.197.4304.691