By N.F. Krasnov
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Extra info for Aerodynamics
7) where ~ is a proportionality factor depending ou lhe properties of a fluid. its tempeoralurc and pressure; it i1' better known as the dynamic viscosity. h as the mean free path l and the Illean speed of its molecules. Let IlS consider friction in a tmbulent flow. We shall pro(',eed from the simplified scheme of the appearall('e of additional frictioll forces in turbulent flow proposed llr L. Prandtl for an incompressible fluid. and from the semi-empirical nature of the relations introduced for these forces.
F~~~da~r~~e f:r~:: o~~ which is the same, between the lift and drag coefficients in a flight path coordinate system. This curve, called a polar or the first kind (Fig. /(S rq (m)1. fa and cJlll Me laid off along the axes of abscissas and ordinates, respecth·ely. The relevant angle of attack ct, which is a parameter of the polar in the given case, is written at each point of the curye. ) are the same, the quantity K equals the slope of a vector drawn from the origin of Coor(JiIf the scales of eVA Ch.
Disturbances. it does not retlll"n to its pn'\"iom' me ti8 PI. I. Theory. Aerodynamics 01 an Airfoil and a Wing direction, hilt like a weathercock. turns with its nose part in the direction of the new vleocity vector V. Similar to the aerodynamic centre based on the angle of attack, we can introduce the concept of the aerodynamic centre based on the Sideslip angle \.... hos,e coordinate we shall designate by IFII' 'L'sing Ihis COllccpt, we can represent the degree of static directional -stahility ill the form m~% = -(IFt!