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Observations made on the f ragmentation of two waterdrop s izes, a fter collision with air shocks that were moving at three different sup ersonic velocities , are reported. The possible mechanisms of various aspects of the fragm e ntation process a re disc ussed. The experim ental observations indicate that high-speed-rain-erosion damage should not be observed on sphe res having a diameter as large as 4 feet and moving with a Mach number in the range of 1.3 to 1.7 in rain that has a drop diameter of 1.4 millim eter. Watel'drops of t hi s size should be reduced to mist in t he zone of sep aration between t he detac hed shock and t he surface of the sphere accord ing to the res ul ts that are reported. A rneans to extend th is protection to spher es of smaller diameter or to rain of larger size is pointed out. The need for fur ther experimental observation of t he tim e req uired for the fragmentation of waterdrops using shocks moving at higher Mach numbers is indicated to verify a nd extend the information. 1. 3
Olive G. Engel (Sat,) studied this question.