Engine Competition Extends To Upper Stages

Credit: Source: United Launch Alliance
Main-stage hydrocarbon engines are drawing the most attention and money as the U.S. Air Force and Congress look for a way to shift national security launches off the Russian-built RD-180, but a separate engine competition is underway at the other end of the rockets. Already flying is a modified...
Guy Norris

Guy is a Senior Editor for Aviation Week, covering technology and propulsion. He is based in Colorado Springs.

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