Comment on "Mean Velocity Profile of a Thick Turbulent Boundary Layer Along a Circular Cylinder

C1 shows that the most satisfactory of a number of formulae for the of the in turbulent flow over a slender axisymmetric body of radius a is that of Rao.' The purpose of this Note is to point out that the argument on which Rao's formula is based is unreliable, but that a more reliable argument gives numerical values very close to Rao's and therefore close to the experimental data. Rao argues that because in the viscous sublayer on a slender body the usual linear law u/v# = v^ y/v is replaced by u/v^ = (v^ a/v) In (1 + y/a), the usual law of the wall that extends into the turbulent region,