“Playing Monopoly” (AW&ST May 26/June 2, p. 22) suggests that the U.S. should develop a new hydrocarbon-core-class engine. But for what end?  If I were a consumer of launch services, it would be a moot point whether one fuel type is denser or another has higher chemical performance. What matters on the launch pad is cost and reliability. I understand that United Launch Alliance’s (ULA) Atlas system has some advantage here, so far largely because of the ...

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