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Additional info for Aerodynamic Design of Transport Aircraft
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).
Laminar boundary layer theory started in the early 1900’s by Prandtl. Nowadays it is a well-established theory. However, the situation concerning the turbulent boundary layer is different. Based on experimental data, models have been developed, which rely heavily on the boundary layer velocity profile and the flat-plate (zero pressure gradient) drag as a function of Reynolds number. Despite long periods of research, turbulence models have not yet reached an acceptable accuracy for proper analysis of flows with large pressure gradients.
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