NASA selected Aerojet Rocketdyne of Sacramento, California, to restart production of the RS-25 engine for the agency’s Space Launch System (SLS), the most powerful rocket in the world, and deliver a certified engine. SLS will use four RS-25 engines to carry the agency’s Orion spacecraft and launch explorers on deep space missions, including to an asteroid placed in lunar orbit and ultimately to Mars.
Part of NASA’s strategy to minimize costs of developing the SLS rocket was to leverage the assets, capabilities, and experience of the Space Shuttle Program, so the first four missions will be flown using 16 existing shuttle engines that have been upgraded.
Under the $1.16 billion contract, Aerojet Rocketdyne will modernize the space shuttle heritage engine to make it more affordable and expendable for SLS. The contract runs November 2015 and continues through Sept. 30, 2024.
The new RS-25 engine developed under this contract will have fewer parts and welds and will be certified to a higher operational thrust level. The new engine benefits from improvements in materials and manufacturing techniques such as five-axis milling machines, 3-D manufacturing and digital X-rays.