In contrast to this, information from Abbot & von Doenhof and McCormick (see Appendix 2) showed that at Reynolds Numbers of 2 million and less, increasing thickness over 12% of chord (0.12c) had little effect on –cLmax, and this could have significance for a great many competition categories, except perhaps the very fastest. The implication of this is that thickness doesn’t really matter in our speed regime. But is this really the case? Using CFD to take a new look at thickness using similar basic 2D methods to those used in the previous sections, the results were rather different to what either of those textbooks stated.