ESDU 86021 is a comprehensive introduction to the concept and
\nuse of derivatives in determining aircraft stability. After
\nexplaining a systematic method for expressing aerodynamic forces,
\nmoments and derivatives in dimensionless form, the equations of
\nmotion for an aircraft treated as a rigid body are developed and
\nthe linearised small-perturbation form introduced. The conditions
\nare outlined for the separation of the equations into a lateral and
\na longitudinal set, and a detailed study is made of the behaviour
\nof an aircraft disturbed with controls fixed from straight
\nsymmetric level flight. A comprehensive practical worked example
\nillustrates the use of the techniques. A comparison is made between
\nthe ISO notation for derivatives used by ESDU and the most widely
\nused notation in the USA, equations are given for deriving the
\nlongitudinal derivatives from the force and moment coefficients,
\nand reference is included to all the ESDU validated data for
\nlateral derivatives. Also included is the traditional treatment of
\nstatic stability and manoeuvre margins, and the relation between
\nstatic and dynamic stability is discussed. A description is given
\nin simple terms of commonly occurring lateral modes of an aircraft
\nfollowing a disturbance.<\/p>\n
Conversion factors are summarised for aerodynamic derivatives,
\nfor dynamic-normalised concise derivatives, and for obtaining
\ndynamic-normalised quantities.<\/p>\n
A computer program to obtain the roots of the characteristic
\nequations for the controls-fixed longitudinal and lateral stability
\nof an aircraft is provided as ESDUpac A8621.<\/p>\n","protected":false},"excerpt":{"rendered":"
Introduction to aerodynamic derivatives, equations of motion and stability (including the classical criteria of longitudinal stability and control, and description of the lateral modes of motion)<\/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 2015-03-01<\/td>\n 72<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":558705,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-558695","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\/558695","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\/558705"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=558695"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=558695"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=558695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}