Viscous drag effects on slender cones in low- density hypersonic flow

T large viscous effects on the drag of slender cones in a Mach 10 low-density flow have been presented along with higher Mach number continuum data by Whitfield and Griffith. The purpose of this note is to present new lowdensity data near Mach 20 for freestream Reynolds numbers between 2500 and 6200/in. (equilibrium values). These zero-lift drag data (Table 1) were obtained in the 100-in.diam Tunnel F, an impulse tunnel of the hotshot type. 1.00