<\/p>\n\n\n\n
SMC \/ Mean chord line<\/strong><\/p>\n\n\n\n often used in aircraft design, is a geometric parameter representing the average chord length of a wing. It’s calculated by dividing the wing’s surface area by its span<\/strong>, effectively representing the chord of a rectangular wing with the same area and span. While SMC relates to the wing’s overall geometry, it’s not typically used in aerodynamic calculations<\/p>\n\n\n\n <\/p>\n\n\n\n MAC (Mean Aerodynamic Chord)<\/strong><\/p>\n\n\n\n By definition, MAC is the average chord<\/a> length of a tapered, swept wing<\/a><\/p>\n\n\n\n <\/p>\n\n\n\n The calculation involves Integral (\u6578\u5b78\u7a4d\u5206\uff09 <\/p>\n\n\n\n <\/p>\n\n\n\n In terms if application, in large aircraft, centre of gravity<\/a> limitations and the actual centre of gravity are often expressed in terms of percent MAC.<\/p>\n\n\n\n <\/p>\n\n\n\n It\u2019s not only the length but also the position of MAC is often important. In particular, the position of the centre of gravity (CG) of an aircraft is usually measured relative to the MAC, as the percentage of the distance from the leading edge of MAC to CG with respect to MAC itself.<\/p>\n\n\n\n <\/p>\n\n\n\n Summary:<\/p>\n\n\n\n The Mean Aerodynamic Chord (MAC) and Standard Mean Chord (SMC) are both ways to represent the average chord length of a wing, but they are calculated and used differently!<\/p>\n\n\n\n MAC is a more aerodynamically relevant measure, especially for swept and tapered wings, while SMC is a simpler geometric calculation useful for basic wing geometry.<\/p>\n\n\n\n <\/p>\n\n\n\n Ref:<\/p>\n\n\n\n https:\/\/skybrary.aero\/articles\/mean-aerodynamic-chord-mac<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" SMC \/ Mean chord line often used in aircraft design, is a geometric parameter representing the average chord length of a wing. It’s calculated by dividing the wing’s surface area by its span, effectively representing the chord of a rectangular wing with the same area and span. While SMC relates to the wing’s overall geometry,