ATK has provided additional details about its domestic alternative to the Russian-built RD-180 engine currently in use on the venerable Atlas V rocket of United Launch Alliance (ULA). While ULA has aligned with Blue Origin’s BE-4 engine, ATK proposal of a solid-fueled first stage – as a reliable, cost-effective, and commercial alternative to the RD-180 – provides insight into the wealth of American-built engine options.
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