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Loading contentThe Soviet super heavy-lift Moon rocket; all four launch attempts (1969–1972) failed and the program was cancelled. The flown vehicle used Kuznetsov NK-15 engines; the improved NK-33 (for the never-flown N1F) flew decades later on other rockets.
Facts on this topic will be cited from these primary and reference sources.
A specialist reference compilation of launch vehicles, stages, and spacecraft across all spacefaring nations.