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>> “Back in the 1960`s we made zinc-sulfur rockets.” <<
And if we do it now, the JTTF will be on our case in a flash!
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When the Russians launched Sputnik in 1957, the U.S. Army issued a directive for the youth of America to start building rockets so we could catch up to them with future rocket scientists. The army even published a hardcover book on how to construct all kinds of rockets, including ZnS motors. I still have the book.