{"id":559425,"date":"2024-11-05T18:23:55","date_gmt":"2024-11-05T18:23:55","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-970212012\/"},"modified":"2024-11-05T18:23:55","modified_gmt":"2024-11-05T18:23:55","slug":"esdu-970212012","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-970212012\/","title":{"rendered":"ESDU 97021:2012"},"content":{"rendered":"<p>\n\tESDU 97021 provides a graphical semi-empirical method based on a<br \/>\ncorrelation of calculations made using a trailing horseshoe-vortex<br \/>\nmodel to represent a straight-tapered wing with plain flaps over a<br \/>\nrange of wing sweeps, taper and aspect ratios, flap chords and<br \/>\nspans, tailplane locations and Mach numbers. It was found that the<br \/>\ndata could be represented by taking values for a datum geometry and<br \/>\nMach number and applying correction factors for departures from<br \/>\nthat condition. Predictions by the method were then compared with<br \/>\nwind-tunnel data drawn from the literature and a further factor was<br \/>\nfound to be required depending on whether the tailplane was mounted<br \/>\non the body or on the fin. No effects due to flap type were found<br \/>\nand the effect of a central flap cut out is accounted for in the<br \/>\nlift coefficient used in the method which is that due to flap<br \/>\ndeployment. For wings that are not straight-tapered the equivalent<br \/>\nwing concept of ESDU 76003 may be used. The method applies to<br \/>\nfully-attached flow with linear aerodynamic characteristics (an<br \/>\nangle of attack range from -3 to 12 degrees is suggested). Overall,<br \/>\nthe mean downwash angle is predicted to within 15 per cent as shown<br \/>\nby a sketch comparing predictions with experimental results. A<br \/>\nfully-worked example illustrates the use of the method. A computer<br \/>\nprogram of the method is provided as ESDUpac A9721. ESDU 80020<br \/>\nprovides a prediction method for the case with flaps<br \/>\nundeployed.\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Effect of trailing-edge flap deployment on average downwash at the tailplane at low speeds<\/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>2012-02-01<\/td>\n<td>103<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":559433,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559425","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\/559425","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\/559433"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559425"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559425"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}