Abstract
T HE authorappreciatesthe interest shown in hisTechnicalNote1 from these two readers. They point out that the fundamental problemwith a drag coef cient, de ned by dividing the drag force by the dynamic pressure, is that it becomes in nitely large at static conditions because the dynamic pressure is zero. Equations with this kind of behaviorcan be troublesomefor use in simulation computer codes,which are written to consider a complete range of ight Mach numbers, including the static condition. In any case Fig. 9.3 on p. 220 of Ref. 2 shows nite additive drag coef cient values at static conditions. This same gure also presents the equations allegedly used to generate all of the coef cient values shown in the gure. The intent of the Note was to show how these static drag coef cient values were determined because the equations provided in the gure did not appear to produce them. As was described in the Note, these values were calculated using an equation that can be derived from the two drag coef cient equations provided in the
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