{"id":558774,"date":"2024-11-05T18:21:59","date_gmt":"2024-11-05T18:21:59","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-870312013\/"},"modified":"2024-11-05T18:21:59","modified_gmt":"2024-11-05T18:21:59","slug":"esdu-870312013","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-870312013\/","title":{"rendered":"ESDU 87031:2013"},"content":{"rendered":"<p>\n\tESDU 87031 involves estimating separately two contributions to<br \/>\nthe zero-lift angle. One is due to camber, taken as that<br \/>\ncorresponding to the wing-root section and assumed constant across<br \/>\nthe span. The other is due to the combined effects of geometric<br \/>\ntwist and of camber-dependent twist associated with spanwise camber<br \/>\nchanges from that at the root. The method applies to a wide range<br \/>\nof cambered and twisted straight-tapered wings, provided that the<br \/>\nlocal effective twist is less than about 10 degrees and the flow is<br \/>\nfully attached and subsonic at zero-lift. It can be applied to<br \/>\nwings with cranked or curved edges using an &#034;equivalent wing<br \/>\nplanform&#034; as defined in ESDU 76003. The method correlates<br \/>\nwind-tunnel test data drawn from a wide range of sources in the<br \/>\nliterature to within degrees. Illustrations of typical uses for the<br \/>\nmethod are given in the form of four worked examples. A computer<br \/>\nprogram of the method is provided as ESDUpac A8731 and described in<br \/>\nan appendix.\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Wing angle of attack for zero lift at subcritical Mach numbers<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/esdu\/\"><b>ESDU<\/b><\/a><\/td>\n<td>2013-01-01<\/td>\n<td>40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":558783,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-558774","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/558774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/558783"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=558774"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=558774"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=558774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}