The Delta N or Thor-Delta N was an American expendable launch system used for nine orbital launches between 1968 and 1972. It was a member of the Delta family of rockets and the last Delta to be given an alphabetical designation – subsequent rockets were designated using a four digit numerical code.The Delta N consisted of two stages. The first stage was the Long Tank Thor a stretched version of the Thor missile previously flown on the Delta L and Delta M.
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