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nozzle × 118rockets × 35
engine-design × 35
engines × 26
propulsion × 10
exhaust × 8
spacex × 7
thrust × 6
physics × 5
liquid-fuel × 5
pressure × 5
supersonic × 5
launch × 4
design × 4
engineering × 4
vacuum × 4
combustion × 4
design-alternative × 3
saturn-v × 3
mass × 3
merlin-1d × 3
performance × 3
cooling × 3
apollo-program × 2
space-shuttle × 2