which, in its motion througha fluid, does not give rise to a surface of discontinuity. STEEAM-LINE BODIES AND STEUTS. 11 Practical experience ia, however, entirely opposed to theexistence of such a body. Generally, the motion around an ordinary body may beregarded as composed of two currents, which… … Fig. 6. magnitude of which is determined by the frictional drag at thesurface of discontinuity. It is evident that equilibrium of thefluid can only be satisfied by a flow in the opposite direction tothe wake current. Hence the counterwake current which alwayssurrounds the wake current. Comparison…
Airplanes
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