By N.F. Krasnov

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The distance between the farthest points of an airfoil (section). For n wing with a rectangular pianform, the chord equals the width of the wing. In practice, a wing usually has a chord varying along its span. Either the mean gPOmc:tric chord b = b m equal to b m ~ Swfl or the ml'an aerodynamic chord b = b A is taken as the characteristic tlimengioll for such a wing. The mean aerodynamic chorl] is determined ag the chord of the airfoil of an equivalent rectangular wing for which with an identical wing plan area the moment aerodynamic characleristics are approximately the same as of tlw given wing.

E practical calculations. however, a characterb~ tic geometric quantity is dlOsen beforehand. In aerogpace technology, the area of the mid-section (the largest cross section) of the body Sr = SlIllri is usually chosen ag the characteristic area, and the length of the rocket is taken as the characteristic linear dimension L. = = Sw, tlle wing span l (the distance between tlw wing tips) or the wing chord b arc adopted as the clHlracteristic (Iim('nsions. By the chord of a wing is meant a length equa!

Consequently, '. tly because of the viscosity and due to mixing of the molecules characteristic of a laminar flow, Le. the vallie 'tl = ~ dV:tldy. Hence, , ~ " + '. 11) Prandtl's investigations show that the mixing length l = xy, where x is a constant. 12) It follows from experimental data that in a turbulent flow in direct proximity to a wall, where the intensity of mixing is very low. 12) holds for it. Beyond the limits of this flow. the stres!! "t'l will be very small, and we may consider that the shear stres...