Word: mandrel
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Dates: during 1950-1959
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...holding together crystals of an oxygen-supplying material, such as ammonium perchlorate. The ingredients are first blended to form a semiliquid mass like peanut butter. This is pumped with extreme care into the rocket casing and cured by gentle heat to turn it into an elastic solid. Then a mandrel in the center is pulled out, leaving a roughly star-shaped cavity on whose surface the fuel will start to burn when the rocket is fired...
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