The Aerodynamics of a Falling Hopea Odorata Seed
| Autor: | Jonathan Vitayatanagorn |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | International Scholastic Journal of Science, Vol 17, Iss 1, Pp 2-2 (2023) |
| Druh dokumentu: | article |
| ISSN: | 2408-1884 |
| Popis: | The double-winged seeds of the Hopea odorata tree generate an auto-rotating motion from their elongated sepals as they fall. The flight dynamics of the seed were analyzed using high-speed video. Terminal velocity and spin frequency were measured as a function of changing seed mass. Both were shown to increase with increasing seed mass. It was also shown that lift force provided 60-85% of the retarding force generated during descent and that the coefficient of lift for the seed decreased from approximately 0.7 to 0.3 as spin frequency increased. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|