Aerodynamic Design of Transport Aircraft by E. Obert

By E. Obert

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For that case certain climb requirements must be met. Consequently the aircraft must be equipped with a minimum of two engines. A 2-engined aircraft must be able to continue the take-off after an engine failure on one engine, or 50% of the installed power. 4%. 2% . From the above it can be concluded that the everyday climb performance (with all engines operational) of a 2-engined aircraft will be considerably better than the performance of a 4-engined aircraft. This is an important factor when considering the noise characteristics of a particular aircraft from a certification point of view.

84. 0. 77. 1 - Variation of local pressure coefficient and local Mach number with free stream Mach number according to Kármán-Tsien. Source: Abbott & Von Doenhoff, Theory of Wing Sections 44 5)&3&-"5*0/#&58&&/461&37&-0$*5:"/%13&4463&$0&''*$*&/5t The relation between local Mach number, Mlocal and static pressure coefficient cp as a function of free stream Mach number M, including local Mach number above Mlocal = 1 The relation presented below is strictly speaking only valid for isentropic flow.

16 5)&"*3$3"'5%&4*(/130$&44t 4. Flight handling characteristics The prime aim of aerodynamic design is finding an external shape that optimizes lift and drag characteristics for performance purposes. Obtaining satisfactory flight handling characteristics requires attention directed primarily to tailplane, fin and control surfaces. Concerning the size of these components there are conflicting requirements for performance (tail and control surfaces as small as possible) and flight handling (large surfaces).

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