A TOMIZATION of large liquid droplets subjected to high ^J^relative gas velocities is of interest to the field of liquid propellant combustion and instability processes, which occur in rocket engines. It is desirable to have quantitative information for the time rate of mass loss from the droplet as a function of the gas stream and droplet characteristics. The aerodynamic atomization process is known to be intimately related to the propagation of capillary waves over the surface of the liquid.2 The capillary waves originate from some small surface disturbance, are caused to grow in amplitude by aerodynamic forces, and eventually crest and disintegrate into a myriad of microdroplets. Analysis of the capillary wave dynamics for plane liquid surfaces is straightforward,but for droplets, because of the surface curvature, divergent propagation of capillary waves from the forward stagnation point, and the magnitude of deformation that occurs when liquid droplets are subjected to high velocity gas flows, a sound theoretical development would be excessively and perhaps intractably complicated. This note describes a technique that was used to experimentally measure the rate of mass atomization from liquid droplets that were subjected to a high relative gas velocity. The results are expressed as an equation that empirically relates the mass number (Mn) to the Reynolds number (Re') and Weber number (We) as defined in the Nomenclature.