Consider again the model truck example, except that the maximum speed of the wind tunnel is only 50 m/s. Aerodynamic force data are taken for wind tunnel speeds between V = 20 and 50 m/s—assume the same data for these speeds as those listed in Table 7–7. Based on these data alone, can the researchers be confident that they have reached Reynolds number independence?

TABLE 7-7 Wind tunnel data: aerodynamic drag force on a model truck as a function of wind tunnel speed V, m/s 20 25 30 35 40 45 50 25862 55 60 70 FD, N D 12.4 19.0 22.1 29.0 34.3 39.9 47.2 55.5 66.0 77.6 89.9