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Employing a novel experimental approach, we analyzed the kinematics of both feathered and nonfeathered projectiles during their transition from air to water using high\u2010speed imaging and an onboard accelerometer. The drag coefficients were determined through two methods: a direct calculation from the acceleration data and a theoretical approach fitted to the observed velocity profiles. Our results indicate that feathers significantly increase the drag force during water entry, with feathered projectiles exhibiting approximately double the drag coefficient of their smooth counterparts. These findings provide new insights into the role of avian feather morphology in diving mechanics and have potential implications for the design of bioinspired aquatic vehicles in engineering. The study also discusses the biological implications of increased drag due to feathers and suggests that factors such as body shape might play a more critical role in the diving capabilities of birds than previously understood.<\/jats:p>","DOI":"10.1111\/nyas.15181","type":"journal-article","created":{"date-parts":[[2024,7,4]],"date-time":"2024-07-04T10:43:10Z","timestamp":1720089790000},"page":"74-81","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Effect of feathers on drag in plunge\u2010diving birds"],"prefix":"10.1111","volume":"1537","author":[{"given":"Florent","family":"Debenedetti","sequence":"first","affiliation":[{"name":"D\u00e9partement de M\u00e9canique Ecole Polytechnique  Palaiseau France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sunghwan","family":"Jung","sequence":"additional","affiliation":[{"name":"Department of Biological and Environmental Engineering Cornell University  Ithaca New York USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,7,4]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abo5888"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00348-023-03712-w"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1608628113"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1088\/1748-3190\/ab38cc"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/evo.14024"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps08868"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.1c04480"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.2534\/jjasnaoe1968.1998.53"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11804-012-1136-z"},{"key":"e_1_2_9_11_1","first-page":"51","article-title":"A review on the drag reduction methods of the ship hulls for improving the hydrodynamic performance","volume":"4","author":"Ahmadzadehtalatapeh M.","year":"2015","journal-title":"International Journal of Maritime Technology"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11804-018-0028-2"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.egyr.2019.11.157"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40868-021-00104-9"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.3390\/jmse11071315"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.204.9.1547"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1098\/rsif.2019.0125"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1098\/rsif.2019.0267"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.149.1.449"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.135.1.253"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.038109"},{"key":"e_1_2_9_22_1","volume-title":"The flight of birds: Wing function in relation to flight speed","author":"Brown R. 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