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The RL10 is a terribly expensive engine to produce (I've seen estimates of US$25 million per unit), mainly due to its welded-tube nozzle construction. I expect Vinci will be substantially cheaper to produce on a one-for-one basis, let alone two-for-one. Furthermore, export of RL10s is restricted by US law, though I imagine the ESA could get a waiver if the ...

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