By E. Houghton, P. Carpenter

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The pressure distribution ahead of the point of maximum thickness is little altered by real-flow effects. The drag generated by the suction pressures downstream of the point of maximum thickness is slightly reduced in a real flow. But this effect is greatly outweighed by a substantial reduction in the thrust generated by the high-pressure region around the trailing edge. Thus the exact cancellation of the pressure forces found in an inviscid flow is destroyed in a real flow, resulting in an overall rearwards force.

38) is extremely valuable, as it shows that the values of nd/V should depend only on the corresponding value of V d / v ,regardless of the actual values of the original variables. This means that if, for each observation, the values of nd/V and V d / v are calculated and plotted as a graph, all the results should lie on a single curve, this curve representing the unknown function g. A person wishing to estimate the eddy frequency for some given cylinder, fluid and speed need only calculate the value of V d / v , read from the curve the corresponding value of nd/V and convert this to eddy frequency n.

8. In each case the arrow shows the direction of the positive force or moment. All three forces are mutually perpendicular, and each moment acts about the line of one of the forces. The system of forces and moments described above is conventionally used for performance analysis and other simple problems. For aircraft stability and control studies, however, it is more convenient to use a slightly different system of forces. f. 43) (where F i s an aerodynamic force and S is an area) is similar to the type often developed and used in aerodynamics.

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