The Part Played by Skin Friction in Aeronautics

Extract

In Part V of my recent paper, when discussing and tabulating the conditions that obtain at low Reynolds numbers (more especially as concerns the dynamics of flight of the model depicted in Fig. 14), the data shown in Table IX and plotted in Fig. 15 need correction. It appears that in the tabulation an incorrect constant was taken. Furthermore, the distinction which exists at low Reynolds numbers between data secured in the wind channel, in which, generally speaking, wind velocity is constant, and the data relating to a glider in free flight in which W is constant, was not sufficiently explained.