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Fwiw, we did ultrasound only on the shuttle solid boosters, nitroglycerin mixed with aluminum chlorhydrate and a rubber binder/filler is a wee bit unstable to be putting much energy into. They did withstand rail and truck transport but not dropping
Since everyone was paranoid about propellant but not temps or o rings this kinda worked
Those were fun days.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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