Why do missiles have fins, while modern space rockets don’t?
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Fins are useful in atmosphere, but a space rocket quickly leaves it so fins become useless and it has to steer without anyway. If it can steer without anyway, then why bother with fins to begin with? It’s dead weight.
Still, some space launchers do have fins, Chinese launchers for example, aerodynamic stability is necessary and small fins can ease the engineering constraints in other parts of the design.
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