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SLS Engine Section Approaches Finish Line for First Flight

By Doug Messier
Parabolic Arc
March 24, 2019
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SLS core stage engine section. (Credit: NASA/Jude Guidry)

NEW ORLEANS (NASA PR) — NASA and Boeing have completed the majority of outfitting for the core stage engine section for the first flight of the agency’s new Space Launch System (SLS) rocket. The engine section, located at the bottom of the 212-foot-tall core stage, is one of the most complex parts of the rocket. Technicians at NASA’s Michoud Assembly Facility in New Orleans have installed more than 500 sensors, 18 miles of cables, and numerous other critical systems for mounting, controlling and delivering fuel to the rocket’s four RS-25 engines.

The core stage tanks hold cryogenic liquid hydrogen and liquid oxygen that are combusted by the engines to produce 2 million pounds of thrust to help send SLS to space for missions to the Moon. On the exterior of the engine section, technicians attached cork insulation for thermal protection and painted it white as well as finishing up other systems including fittings where solid rocket boosters attach.

Next, NASA and Boeing, the SLS prime contractor, will add the boat-tail to the bottom of the engine section and finish up some outfitting, integration and avionics functional testing. The boat-tail is an extension that fits on the end of the engine section. The engines are inserted through openings in the boat-tail, which acts much like a fairing to cover and protect most of engines’ critical systems.

The engines are mounted inside the engine section, and only the RS-25 engine nozzles extend outside the boat-tail. The team is using lessons learned building and outfitting the engine section for the first integrated flight of SLS to accelerate outfitting of the engine section for the second SLS mission. The primary structure of the core stage engine section for the second SLS flight has been built and covered with primer as it prepares for its outfitting and is visible in this image, just behind the first engine section.

7 responses to “SLS Engine Section Approaches Finish Line for First Flight”

  1. Jeff Smith says:

    Mate it. Fly it next summer.

    • ThomasLMatula says:

      Now, now, that would be how SpaceX does it. NASA has a few hundred more steps before getting around to doing that.

      • Terry Stetler says:

        Counting the liquids only, the SLS first stage has less liftoff thrust than Falcon 9 Block 5; 7,440 kN to 7,607 kN, respectively.

        ATK had good lobbyists.

      • Jeff Smith says:

        True. But it’s also how NASA does it when they have a schedule crunch. This is S-V “all up testing” all over again. Marshall’s approach is always very conservative, has been since von Braun. The first time they brought in George Mueller to break the engineers’ pencils, now it’s Bridenstine. Some things never change.

        • duheagle says:

          I’d say Mr. B is more about breaking chops than pencils. Just for the record, I think that’s a good thing.

          By the way, do engineers even use pencils anymore?

          But I guess “breaking their mice and trackballs” doesn’t have quite the same punchy quality about it.

      • redneck says:

        We will go to the moon and do these these other things, before this century is out…….

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