Terran R, the heavy-lift car presently being developed by Relativity House, is reaching vital milestones forward of a possible debut on the finish of 2026. Integration of important subsystems for the rocket’s second stage was just lately finalized forward of its switch to NASA’s Stennis House Middle for testing. Moreover, structural work on the qualification article for the primary stage is full and is being ready for testing, whereas the flight article is advancing by means of tank and thrust-structure integration.
Terran R’s second stage heads to Stennis for testing
As of June 2026, the second stage for the primary flight-ready Terran R had accomplished remaining integration with numerous subsystems. The crew additionally put in fluid techniques, brackets, harnesses, valves, and raceway {hardware}. These have been the ultimate steps earlier than groups put in adapters, accomplished remaining checkouts, and ready the car for transit. The second stage then left the manufacturing unit and traveled to the Port of Lengthy Seashore, the place it was loaded onto a vessel and shipped to NASA’s Stennis House Middle.
Forward of the transport, Relativity performed preparations for second stage testing on the A2 take a look at stand at Stennis. This included the preliminary startup of the environmental management system (ECS) and a liquid oxygen (LOX) flush on the highest deck to validate the {hardware} earlier than loading propellants.
From engine qualification to advancing stand readiness, groups are getting ready for a busy season of Terran R testing.
NASA Stennis, MS
— Relativity House (@relativityspace) June 10, 2026
NASA Stennis, MS
Aeon V second stage engine qualification marketing campaign accomplishedThe groups additionally put in the drawbridge for second stage testing; the aft take a look at adapter was delivered, and the diverter for the stand was finalised earlier than the stand was prepped for supply. NASA constructed the A2 take a look at stand in 1966 to check and certify the Saturn V’s second stage. After the Apollo program, NASA examined the House Shuttle’s important engines on the web site from 1975 to the early 2000s.
Aeon V, the vacuum engine on the second stage, has accomplished its qualification marketing campaign, verifying key service-life, length, and begin capabilities in preparation for flight one. The gas-generator cycle engine is fueled by liquid methane (CH4) and liquid oxygen (LOX).
Terran R’s first stage continues improvement
Alongside the event of the second stage, all structural work on the qualification article for Terran R’s first stage was accomplished. This contains putting in stringer joiners and doublers to strengthen the exterior skins and thicken the fabric, respectively. Along with the structural work, the downcomer — a pipe that transfers LOX from the highest of the car to the Aeon R thrust construction — has accomplished acceptance testing and has been put in contained in the tank alongside the LOX lid. Groups additionally machined and put in the aft take a look at adapter on the qualification article in preparation for testing.
The qualification article will now endure load testing at Relativity’s facility in Lengthy Seashore, California. The corporate accomplished its take a look at matrix and cargo instances and performed a take a look at readiness evaluation (TRR). Throughout testing, the construction will likely be subjected to hundreds anticipated throughout essential aerodynamic phases of flight, together with a simulation of most dynamic strain.
Render of A2 take a look at stand at Stennis House Middle. (Credit score: Relativity House)
Terran R’s first stage is powered by 13 gas-generator-cycle Aeon R engines that use CH4 and LOX as propellants. Alongside Aeon V qualification testing, Relativity is getting ready the primary flight-ready Aeon R engines for integration with the thrust construction as they return from acceptance testing.
The primary flight-ready Terran R first stage can also be advancing by means of key milestones. The thrust construction is full, and Relativity has built-in its first outer engine LOX and CH4 feedlines. Each interstage barrels are progressing by means of mechanical meeting, with the aft barrel moved to the vertical turning lathe for tooling, trim, and raceway-cutout machining.
In Could, Relativity produced 1,455 flight components, most of which will likely be built-in into the primary stage flight article. Engineers additionally produced part designs for key first-stage subsystems, together with avionics and fluid techniques.
Growth of Launch Advanced 16 nears completion
As soon as the 2 levels have handed every essential testing and integration milestone, they may transfer to Relativity’s Launch Advanced-16 (LC-16) at Cape Canaveral House Power Station in Florida. LC-16, beforehand used for Titan missile improvement within the Nineteen Sixties and ‘70s, was acquired by Relativity in 2019. The corporate redeveloped the pad to assist its Terran 1 car, which flew as soon as from the pad. Following Terran 1’s maiden flight, Relativity introduced it was retiring the car and shifted its focus to Terran R improvement.
{Hardware} at Relativity’s Lengthy Seashore facility. (Credit score: Relativity House)
Following the retirement of Terran 1, the corporate quickly started reconfiguring the pad for Terran R operations. After greater than two years of improvement, the launch web site is nearing its remaining configuration. The bodily profile of LC-16 is full, with the 92.96-meter (305 ft) water tower now at its remaining peak. In the meantime, crews proceed to erect the lightning safety system, the final main structural ingredient to go vertical.
Civil engineering and concrete work are additionally of their remaining levels of improvement. Concrete for the primary method highway has been poured, and development of the launch desk’s mid-deck is ongoing. Last elements of the pad safety and plumbing are being put in, together with the higher strongback fluid brackets on the transporter erector. Waterproofing of the pad assist system facility (PSF) was additionally accomplished after spray foam set up.
LC-16 is constant its transition from development to activation, with main infrastructure and floor techniques work advancing throughout the positioning.
✓ Water tower reached its remaining peak of 305 toes
✓ Lightning safety system erection continues throughout the positioning
✓… pic.twitter.com/0uhbFHg6XN— Relativity House (@relativityspace) June 11, 2026
The Horizontal Integration Facility (HIF), the place Terran R’s levels will likely be mated after supply, is now structurally full, and groups are shifting focus to outfitting actions. A 99.8 metric ton bridge crane was put in within the HIF’s cleanroom part to assist lifting, mating, and placement actions of Terran R’s levels on the transporter erector.
This infrastructure build-out is underpinned by robust business demand. Relativity presently has a backlog of roughly $3 billion in pre-launch contracts. This features a multi-year, multi-launch settlement with OneWeb to deploy its second-generation satellite tv for pc constellation. In 2022, Relativity signed a partnership with Impulse House to ship a business payload to Mars on a trans-Mars injection (TMI) orbit.
With the second stage on its technique to Stennis for testing, the first-stage qualification article getting ready for structural load testing, and LC-16 quickly approaching its remaining configuration, Relativity House is coming into the pivotal remaining part of Terran R improvement. If this tempo holds, the corporate will stay on monitor for a maiden flight by the tip of 2026 — introducing a brand new heavy-lift launch system with a payload capability considerably larger than SpaceX’s Falcon 9.
(Lead Picture: Second stage take a look at article earlier than touring to the Port of Lengthy Seashore. Credit score: Relativity House)
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