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An experimental method of determining heat-transfer rates up to 15,000 Btu/ft 2 sec on ballistic range models traveling at hypersonic Mach numbers is described. Measurements of the instantaneous melt location on the surface of a specially designed copper calorimeter are obtained from laser lighted photographs. Heating rates are inferred using a 2-D transient heat conduction analysis. Data generated using this technique are shown to be in agreement with exact numerical boundary-layer predictions. Sensitivity studies also show that heating rates can be measured within ± 10%. The procedure is useful for studying several energy transport mechanisms at hypersonic conditions. Nomenclature k = thermal conductivity, Btu/ft sec°R L = axial length of sleeve, ft q = incident heat-transfer rate, Btu/ft 2 sec TI = slab temperature, initial, °R T s = surface temperature, °R meit = axial length to melt location, ft a = thermal diffusivity, ft 2 /sec d = thickness of sleeve, ft 9 = exposure time, sec

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