Rainfall Rates and Drop-Size Distributions for Environmental Testing,
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
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Rainfall rates and associated drop-size distributions are important considerations in the design and testing of most items that must operate in and withstand the effects of weather. Erosion of aerospace vehicles, triggering of impact fuses and leakage into sealed components are some examples of the many ways that rain can impact different types of hardware. To properly design and test systems and equipment for rain, appropriate intensities and associated drop-size distributions need to be determined. This paper discusses the pertinent climatic data available on rain, how they were used to derive the design values presented in MIL-STD-21OC, and how to determine the appropriate intensity values for each systems intended life cycle.