NASA tests engines at the agency’s Stennis Space Center near Bay St. Louis, Mississippi to fully understand their performance capabilities and limits. For RS-25 engines, that means capturing mountains of data as operators simulate how the engine must fire during launch of NASA’s powerful SLS (Space Launch System) rocket.
Viewing an RS-25 engine hot fire is a visceral experience – ignition sounds like thunder, the ground shakes, a steam cloud billows – but a central reason for conducting a test is much less observable to viewers.
Four RS-25 engines help launch each SLS rocket. NASA and Aerojet Rocketdyne modified 16 remaining space shuttle main engines for use on Artemis missions I through IV. Aerojet Rocketdyne is manufacturing additional engines, incorporating dozens of improvements in its production process. It plans to employ new manufacturing processes and techniques, including 3D printing, designed to more efficiently produce the engines.
The amount of data collected is staggering – engineers who have worked at NASA Stennis for decade, say the redesigned RS-25 engine is one of the more heavily instrumented engines they have seen.
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