{"id":595816,"date":"2017-10-20T02:00:00","date_gmt":"2017-10-19T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=6bfd2ee63755743b8c6be0b9ada90cbf"},"modified":"2017-10-20T02:00:00","modified_gmt":"2017-10-19T23:00:00","slug":"indeterminacy-of-drag-exerted-on-an-arrow-in-free-flight-arrow-attitude-and-laminar-turbulenttransition","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=595816","title":{"rendered":"Indeterminacy of drag exerted on an arrow in free flight: arrow attitude and laminar-turbulent\r\ntransition"},"content":{"rendered":"<p>The aerodynamic properties of an arrow (A\/C\/E; Easton) were investigated in an extension of our<br \/>\nprevious work, in which the laminar-turbulent transition of the boundary layer on the arrow shaft<br \/>\nwas found to take place in the Re number range of 1.2\u00a0\u00d7\u00a010 4\u00a0<\u00a0Re\u00a0<\u00a02.0\u00a0\u00d7\u00a010 4 . In this paper, we\nfocus on the influence of the arrow\u2019s attitude on the transition. Two types of vane (Spin Wing vane\nand Gas Pro vane) are fletched, and their stabilizing effects are compared. Two\nsupport-interference-free tests are performed to provide aerodynamic properties such as the drag,\nlift and pitching moment coefficients. The static aerodynamic properties are measured in a wind\ntunnel with JAXA\u2019s 60 cm magnetic suspension and balance system. When the arrow is aligned with the\nflow, the boundary layer remains laminar for Re\u00a0<\u00a01.5\u00a0\u00d7\u00a010 4 , and the drag coefficient is\napproximately 1.5 for 1.0\u00a0\u00d7\u00a010 4\u00a0<\u00a0Re\u00a0<\u00a01.5\u00a0\u00d7\u00a010 4...\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The aerodynamic properties of an arrow (A\/C\/E; Easton) were investigated in an extension of our<br \/>\nprevious work, in which the laminar-turbulent transition of the boundary layer on the arrow shaft<br \/>\nwas found to take place in the Re number range of 1.2\u00a0\u00d7\u00a0&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-595816","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/595816","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=595816"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/595816\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=595816"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=595816"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=595816"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}