Diameter effect and front curvature measurements are reported for rate stick experiments on commercially available prilled ANFO (ammonium-nitrate/fuel-oil) at ambient temperature. The shots were fired in paper tubes so as to provide minimal confinement. Diameters ranged from 77 mm (« failure diameter) to 205 mm, with the tube length being ten diameters in all cases. Each detonation wave shape was fit with an analytic form, from which the local normal velocity D n , and local total curvature K,

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... ere generated as a function of radius R, then plotted parametrically to generate a D n (x) function. The observed behavior deviates substantially from that of previous explosives, for which curves for different diameters overlay well for small K but diverge for large AT, and for which K increases monotonically with R. For ANFO, we find that D n (x) curves for individual sticks 1) show little or no overlap-with smaller sticks lying to the right of larger ones, 2) exhibit a large velocity deficit with little A:variation, and 3) reach a peak /rat an intermediate R.