Figure 7.
The plot compares R e raised to 1 over 2 C f against xi. The horizontal axis is xi and ranges from 0.0 to about 1.6. The vertical axis is R e raised to 1 over 2 C f and ranges from minus 10 to 40. The legend states epsilon equals 0.1 for solid curves and equals 0.4 for dashed curves. The M values are 0, 2, and 4. All curves start near 0 at xi 0.0. The curves rise and then oscillate with increasing amplitude as xi increases. The dashed curves dip below 0 before xi about 0.8 and show larger oscillations after xi about 1.0. The largest peaks occur near xi about 1.4 to 1.5, with the highest dashed curve rising close to 40. An arrow points upward through the curve group to mark the M progression.Variations of M and on surface drag