Efficiency characteristics of crescent-shaped wings and caudal fins
Caudal (tail) fins of fish and aquatic mammals that cruise long distances, and wings of certain birds, often have the shape of a crescent moon. This study investigates how the crescent shape contributes to the traveling performance of these animals. A steady-flow theory (Maskew, 1982) that correctly...
Gespeichert in:
| Veröffentlicht in: | Nature (London) 1987-01, Vol.325 (6103), p.435-437 |
|---|---|
| 1. Verfasser: | |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 437 |
|---|---|
| container_issue | 6103 |
| container_start_page | 435 |
| container_title | Nature (London) |
| container_volume | 325 |
| creator | Van Dam, C. P. |
| description | Caudal (tail) fins of fish and aquatic mammals that cruise long distances, and wings of certain birds, often have the shape of a crescent moon. This study investigates how the crescent shape contributes to the traveling performance of these animals. A steady-flow theory (Maskew, 1982) that correctly models the trailing wake was used to analyze lifting surface efficiency, which is dependent on the level of induced (or vortex) drag for a given lift and span of the lifting surface. This analysis shows that backward curvature of a wing improves induced efficiency to a value greater than that of the flat untwisted wing of elliptical shape considered optimal in classical wing theory (Prandt, 1921 and Munk, 1921). This increase of induced efficiency results from the nonplanar trailing vortex sheet produced by the crescent-shaped wing at a given angle of attack. |
| doi_str_mv | 10.1038/325435a0 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_35166662</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>24447378</sourcerecordid><originalsourceid>FETCH-LOGICAL-c430t-1edbca3f41f2fbd0ce407470d7eea315a1a67fbfdea07ab9a6541ff48e45b5bf3</originalsourceid><addsrcrecordid>eNqF0D1rHDEQBmBhEvDFCeQHpFhMMG42Hkmjla4Mh7_A4CauxaxWimXW2rNmj-B_7zXnuEiTaaZ5eOdDiK8SfkjQ7kwrg9oQHIiVRNu12Dn7QawAlGvB6e5QfGJ-AAAjLa7E5jylHHIs4bkJ91QpzLFmnnPgZkpNqJFDLHPL97SNQ_Mnl9_cUBmaQLuBxiblwp_Fx0Qjxy9v_UjcXZz_2ly1N7eX15ufN21ADXMr49AH0gllUqkfIEQEixYGGyNpaUhSZ1OfhkhgqV9TZxaa0EU0vemTPhIn-9xtnZ52kWf_mJftxpFKnHbstZHdUuq_UCGi1dYt8Pgf-DDtalmO8AoQFVoHCzrdo1An5hqT39b8SPXZS_CvP_d_f77Q7295xIHGVKmEzO_eSWVg_Tr2254VYvJlruzl2lkA1EqhfgGcVoiR</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>204424780</pqid></control><display><type>article</type><title>Efficiency characteristics of crescent-shaped wings and caudal fins</title><source>Springer Nature - Complete Springer Journals</source><source>Nature Journals Online</source><source>NASA Technical Reports Server</source><creator>Van Dam, C. P.</creator><creatorcontrib>Van Dam, C. P.</creatorcontrib><description>Caudal (tail) fins of fish and aquatic mammals that cruise long distances, and wings of certain birds, often have the shape of a crescent moon. This study investigates how the crescent shape contributes to the traveling performance of these animals. A steady-flow theory (Maskew, 1982) that correctly models the trailing wake was used to analyze lifting surface efficiency, which is dependent on the level of induced (or vortex) drag for a given lift and span of the lifting surface. This analysis shows that backward curvature of a wing improves induced efficiency to a value greater than that of the flat untwisted wing of elliptical shape considered optimal in classical wing theory (Prandt, 1921 and Munk, 1921). This increase of induced efficiency results from the nonplanar trailing vortex sheet produced by the crescent-shaped wing at a given angle of attack.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/325435a0</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>Legacy CDMS: Nature Publishing</publisher><subject>Aquatic life ; Aquatic mammals ; Biological and medical sciences ; Fluid Mechanics And Heat Transfer ; Fundamental and applied biological sciences. Psychology ; Mammals ; Marine biology ; Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports ; Zoology</subject><ispartof>Nature (London), 1987-01, Vol.325 (6103), p.435-437</ispartof><rights>1987 INIST-CNRS</rights><rights>Copyright Macmillan Journals Ltd. Jan 29, 1987</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c430t-1edbca3f41f2fbd0ce407470d7eea315a1a67fbfdea07ab9a6541ff48e45b5bf3</citedby><cites>FETCH-LOGICAL-c430t-1edbca3f41f2fbd0ce407470d7eea315a1a67fbfdea07ab9a6541ff48e45b5bf3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,777,781,27905,27906</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=8125098$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Van Dam, C. P.</creatorcontrib><title>Efficiency characteristics of crescent-shaped wings and caudal fins</title><title>Nature (London)</title><description>Caudal (tail) fins of fish and aquatic mammals that cruise long distances, and wings of certain birds, often have the shape of a crescent moon. This study investigates how the crescent shape contributes to the traveling performance of these animals. A steady-flow theory (Maskew, 1982) that correctly models the trailing wake was used to analyze lifting surface efficiency, which is dependent on the level of induced (or vortex) drag for a given lift and span of the lifting surface. This analysis shows that backward curvature of a wing improves induced efficiency to a value greater than that of the flat untwisted wing of elliptical shape considered optimal in classical wing theory (Prandt, 1921 and Munk, 1921). This increase of induced efficiency results from the nonplanar trailing vortex sheet produced by the crescent-shaped wing at a given angle of attack.</description><subject>Aquatic life</subject><subject>Aquatic mammals</subject><subject>Biological and medical sciences</subject><subject>Fluid Mechanics And Heat Transfer</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Mammals</subject><subject>Marine biology</subject><subject>Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports</subject><subject>Zoology</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1987</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNqF0D1rHDEQBmBhEvDFCeQHpFhMMG42Hkmjla4Mh7_A4CauxaxWimXW2rNmj-B_7zXnuEiTaaZ5eOdDiK8SfkjQ7kwrg9oQHIiVRNu12Dn7QawAlGvB6e5QfGJ-AAAjLa7E5jylHHIs4bkJ91QpzLFmnnPgZkpNqJFDLHPL97SNQ_Mnl9_cUBmaQLuBxiblwp_Fx0Qjxy9v_UjcXZz_2ly1N7eX15ufN21ADXMr49AH0gllUqkfIEQEixYGGyNpaUhSZ1OfhkhgqV9TZxaa0EU0vemTPhIn-9xtnZ52kWf_mJftxpFKnHbstZHdUuq_UCGi1dYt8Pgf-DDtalmO8AoQFVoHCzrdo1An5hqT39b8SPXZS_CvP_d_f77Q7295xIHGVKmEzO_eSWVg_Tr2254VYvJlruzl2lkA1EqhfgGcVoiR</recordid><startdate>19870129</startdate><enddate>19870129</enddate><creator>Van Dam, C. P.</creator><general>Nature Publishing</general><general>Nature Publishing Group</general><scope>CYE</scope><scope>CYI</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7QL</scope><scope>7QP</scope><scope>7QR</scope><scope>7SN</scope><scope>7SS</scope><scope>7ST</scope><scope>7T5</scope><scope>7TG</scope><scope>7TK</scope><scope>7TM</scope><scope>7TO</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>K9.</scope><scope>KL.</scope><scope>M7N</scope><scope>NAPCQ</scope><scope>P64</scope><scope>RC3</scope><scope>SOI</scope><scope>H8D</scope><scope>L7M</scope><scope>7SC</scope><scope>7SP</scope><scope>7SR</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>F28</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L~C</scope><scope>L~D</scope></search><sort><creationdate>19870129</creationdate><title>Efficiency characteristics of crescent-shaped wings and caudal fins</title><author>Van Dam, C. P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c430t-1edbca3f41f2fbd0ce407470d7eea315a1a67fbfdea07ab9a6541ff48e45b5bf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1987</creationdate><topic>Aquatic life</topic><topic>Aquatic mammals</topic><topic>Biological and medical sciences</topic><topic>Fluid Mechanics And Heat Transfer</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Mammals</topic><topic>Marine biology</topic><topic>Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports</topic><topic>Zoology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Van Dam, C. P.</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Calcium & Calcified Tissue Abstracts</collection><collection>Chemoreception Abstracts</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Environment Abstracts</collection><collection>Immunology Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Neurosciences Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Oncogenes and Growth Factors Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Nursing & Allied Health Premium</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>Environment Abstracts</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Materials Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><jtitle>Nature (London)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Van Dam, C. P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Efficiency characteristics of crescent-shaped wings and caudal fins</atitle><jtitle>Nature (London)</jtitle><date>1987-01-29</date><risdate>1987</risdate><volume>325</volume><issue>6103</issue><spage>435</spage><epage>437</epage><pages>435-437</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><coden>NATUAS</coden><abstract>Caudal (tail) fins of fish and aquatic mammals that cruise long distances, and wings of certain birds, often have the shape of a crescent moon. This study investigates how the crescent shape contributes to the traveling performance of these animals. A steady-flow theory (Maskew, 1982) that correctly models the trailing wake was used to analyze lifting surface efficiency, which is dependent on the level of induced (or vortex) drag for a given lift and span of the lifting surface. This analysis shows that backward curvature of a wing improves induced efficiency to a value greater than that of the flat untwisted wing of elliptical shape considered optimal in classical wing theory (Prandt, 1921 and Munk, 1921). This increase of induced efficiency results from the nonplanar trailing vortex sheet produced by the crescent-shaped wing at a given angle of attack.</abstract><cop>Legacy CDMS</cop><pub>Nature Publishing</pub><doi>10.1038/325435a0</doi><tpages>3</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0028-0836 |
| ispartof | Nature (London), 1987-01, Vol.325 (6103), p.435-437 |
| issn | 0028-0836 1476-4687 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_35166662 |
| source | Springer Nature - Complete Springer Journals; Nature Journals Online; NASA Technical Reports Server |
| subjects | Aquatic life Aquatic mammals Biological and medical sciences Fluid Mechanics And Heat Transfer Fundamental and applied biological sciences. Psychology Mammals Marine biology Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports Zoology |
| title | Efficiency characteristics of crescent-shaped wings and caudal fins |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-20T15%3A17%3A50IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Efficiency%20characteristics%20of%20crescent-shaped%20wings%20and%20caudal%20fins&rft.jtitle=Nature%20(London)&rft.au=Van%20Dam,%20C.%20P.&rft.date=1987-01-29&rft.volume=325&rft.issue=6103&rft.spage=435&rft.epage=437&rft.pages=435-437&rft.issn=0028-0836&rft.eissn=1476-4687&rft.coden=NATUAS&rft_id=info:doi/10.1038/325435a0&rft_dat=%3Cproquest_cross%3E24447378%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=204424780&rft_id=info:pmid/&rfr_iscdi=true |