Terran R second stage heads to Stennis as Relativity advances toward 2026 debut

Date:
Wed, 17 Jun 2026 22:12:10 +0000

Description:
Terran R, the heavy-lift vehicle currently being developed by Relativity Space, is reaching significant milestones The post Terran R second stage
heads to Stennis as Relativity advances toward 2026 debut appeared first on NASASpaceFlight.com .

FULL STORY ======================================================================

Terran R, the heavy-lift vehicle currently being developed by Relativity Space, is reaching significant milestones ahead of a potential debut at the end of 2026. Integration of essential subsystems for the rockets second stage was recently finalized ahead of its transfer to NASAs Stennis Space Center
for testing. Additionally, structural work on the qualification article for the first stage is complete and is being prepared for testing, while the flight article is advancing through tank and thrust-structure integration.



Terran Rs second stage heads to Stennis for testing

As of June 2026, the second stage for the first flight-ready Terran R had completed final integration with various subsystems. The team also installed fluid systems, brackets, harnesses, valves, and raceway hardware. These were the final steps before teams installed adapters, completed final checkouts, and prepared the vehicle for transit. The second stage then left the factory and traveled to the Port of Long Beach, where it was loaded onto a vessel and shipped to NASAs Stennis Space Center.

Ahead of the transport, Relativity conducted preparations for second stage testing at the A2 test stand at Stennis. This included the initial startup of the environmental control system (ECS) and a liquid oxygen (LOX) flush on the top deck to validate the hardware before loading propellants. From engine qualification to advancing stand readiness, teams are preparing for a busy season of Terran R testing.

NASA Stennis, MS Aeon V second stage engine qualification campaign completed Aeon R first stage engine acceptance testing continues Initial startup of pic.twitter.com/cdotTyH7GS

Relativity Space (@relativityspace) June 10, 2026



The teams also installed the drawbridge for second stage testing; the aft
test adapter was delivered, and the diverter for the stand was finalised before the stand was prepped for delivery. NASA constructed the A2 test stand in 1966 to test and certify the Saturn Vs second stage. After the Apollo program, NASA tested the Space Shuttles main engines at the site from 1975 to the early 2000s. See Also Terran R Updates Commercial Space Forum NSF Shop Click Here to Join L2

Aeon V, the vacuum engine on the second stage, has completed its
qualification campaign, verifying key service-life, duration, and start capabilities in preparation for flight one. The gas-generator cycle engine is fueled by liquid methane (CH4) and liquid oxygen (LOX).

Terran Rs first stage continues development

Alongside the development of the second stage, all structural work on the qualification article for Terran Rs first stage was completed. This includes installing stringer joiners and doublers to reinforce the external skins and thicken the material, respectively. In addition to the structural work, the downcomer a pipe that transfers LOX from the top of the vehicle to the Aeon
R thrust structure has completed acceptance testing and has been installed inside the tank alongside the LOX lid. Teams also machined and installed the aft test adapter on the qualification article in preparation for testing.

The qualification article will now undergo load testing at Relativitys facility in Long Beach, California. The company completed its test matrix and load cases and conducted a test readiness review (TRR). During testing, the structure will be subjected to loads expected during critical aerodynamic phases of flight, including a simulation of maximum dynamic pressure. Render of A2 test stand at Stennis Space Center. (Credit: Relativity Space)

Terran Rs 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 preparing the first flight-ready Aeon R engines for integration with the thrust structure as they return from acceptance testing.

The first flight-ready Terran R first stage is also advancing through key milestones. The thrust structure is complete, and Relativity has integrated its first outer engine LOX and CH4 feedlines. Both interstage barrels are progressing through mechanical assembly, with the aft barrel moved to the vertical turning lathe for tooling, trim, and raceway-cutout machining.

In May, Relativity produced 1,455 flight parts, most of which will be integrated into the first stage flight article. Engineers also produced component designs for key first-stage subsystems, including avionics and
fluid systems.

Development of Launch Complex 16 nears completion

Once the two stages have passed each critical testing and integration milestone, they will move to Relativitys Launch Complex-16 (LC-16) at Cape Canaveral Space Force Station in Florida. LC-16, previously used for Titan missile development in the 1960s and 70s, was acquired by Relativity in 2019. The company redeveloped the pad to support its Terran 1 vehicle, which flew once from the pad. Following Terran 1s maiden flight, Relativity announced it was retiring the vehicle and shifted its focus to Terran R development. Hardware at Relativitys Long Beach facility. (Credit: Relativity Space)

Following the retirement of Terran 1, the company rapidly began reconfiguring the pad for Terran R operations. After more than two years of development,
the launch site is nearing its final configuration. The physical profile of LC-16 is complete, with the 92.96-meter (305 ft) water tower now at its final height. Meanwhile, crews continue to erect the lightning protection system, the last major structural element to go vertical.

Civil engineering and concrete work are also in their final stages of development. Concrete for the main approach road has been poured, and construction of the launch tables mid-deck is ongoing. Final components of
the pad protection and plumbing are being installed, including the upper strongback fluid brackets on the transporter erector. Waterproofing of the
pad support system facility (PSF) was also completed after spray foam installation. LC-16 is continuing its transition from construction to activation, with major infrastructure and ground systems work advancing
across the site.

Water tower reached its final height of 305 feet Lightning protection
system erection continues across the site pic.twitter.com/0uhbFHg6XN

Relativity Space (@relativityspace) June 11, 2026



The Horizontal Integration Facility (HIF), where Terran Rs stages will be mated after delivery, is now structurally complete, and teams are shifting focus to outfitting activities. A 99.8 metric ton bridge crane was installed in the HIFs cleanroom section to support lifting, mating, and placement activities of Terran Rs stages on the transporter erector.

This infrastructure build-out is underpinned by strong commercial demand. Relativity currently has a backlog of approximately $3 billion in pre-launch contracts. This includes a multi-year, multi-launch agreement with OneWeb to deploy its second-generation satellite constellation. In 2022, Relativity signed a partnership with Impulse Space to deliver a commercial payload to Mars on a trans-Mars injection (TMI) orbit.

With the second stage on its way to Stennis for testing, the first-stage qualification article preparing for structural load testing, and LC-16
rapidly approaching its final configuration, Relativity Space is entering the pivotal final phase of Terran R development. If this pace holds, the company will remain on track for a maiden flight by the end of 2026 introducing a
new heavy-lift launch system with a payload capacity significantly higher
than SpaceXs Falcon 9.

(Lead Image: Second stage test article before traveling to the Port of Long Beach. Credit: Relativity Space)

The post Terran R second stage heads to Stennis as Relativity advances toward 2026 debut appeared first on NASASpaceFlight.com .



======================================================================
Link to news story: https://www.nasaspaceflight.com/2026/06/relativity-update-0626/


--- Mystic BBS v1.12 A49 (Linux/64)
* Origin: tqwNet Science News (1337:1/100)