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This vehicle employed liquid propulsion engines burning hydrazine (N 2 H 4 ) fuel and inhibited red fuming nitric acid (IRFNA, "erf-na") oxidizer with a calculated sea-level I sp of around 270 lb f -s/lb m . By contrast, the contemporary Space Shuttle shown on the right employs liquid hydrogen and oxygen (H 2 /O 2 ) engines with a delivered sea-level I sp of 450 lb f -s/lb m .