\n\tESDU 91004 gives a semi-empirical method for estimating the
\nderivative for an axisymmetric forebody-cylinder combination with
\nor without boat-tailing and fins. Slender body theory provides an
\nequation for the sum of the pitching moment derivatives due to
\npitch rate and due to acceleration in heave that is modified
\nempirically to correlate tunnel and range data extracted from the
\nliterature. It involves the normal-force-curve slope which is
\nobtained from ESDU 89008 with correction from ESDU 87033 for the
\neffect of boat-tailing. To obtain the pitch rate derivative, the
\nslender body prediction for the derivative due to acceleration in
\nheave is subtracted from the predicted sum; that requires the
\npitching-moment-curve slope also obtained from ESDU 89008 and
\n87033. For the body alone, predictions are within 20 per cent of
\nthe experimental values. It is noted that higher values of the
\nacceleration in heave derivative can arise when transition occurs
\nat the base, but values for the sum of the derivatives predicted by
\nESDU 91004 are conservative and apply when transition is near the
\npitching axis; this effect does not influence the pitch rate
\nderivative. Range data had a greater scatter than tunnel data and
\nit is suggested that incorrect Magnus effect corrections could
\ncause that. A method is suggested for including the effect of fins,
\nwhich is empirical and based on limited data. It involves modifying
\nthe body alone prediction and using ESDU 70012 to obtain the
\nnormal-force-curve slope, ESDU 91007 for body interference, and
\nESDU 70012 for the aerodynamic centre of the surfaces. Worked
\nexamples illustrate the use of the method and sketches show typical
\ncorrelations achieved.\n\t<\/p>\n","protected":false},"excerpt":{"rendered":"
Pitching moment derivative due to rate of pitch for projectiles at supersonic speeds<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2014-12-01<\/td>\n 28<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":559024,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-559016","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\/559016","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\/559024"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=559016"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=559016"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=559016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}