Rocket Lab Targets 2027 for Neutron First Launch After Dome Defect

Rocket Lab (RKLB ) Corporation said on October 14, 2026 that the first launch of its Neutron medium-lift rocket is now expected in 2027, moving past its previous fourth-quarter 2026 target after inspections found voids in a newly cured carbon-composite forward propellant dome for the vehicle’s first stage.

The Long Beach, California-based company announced the revised timing in an investor-relations news release and filed a Current Report on Form 8-K with the U.S. Securities and Exchange Commission the same day. In the filing, made under Items 7.01, 8.01 and 9.01 and signed by Chief Financial Officer Adam Spice, Rocket Lab said the first launch is anticipated to shift into next year as the team continues development and incorporation of process improvements. The filing added that the company is progressing through key manufacturing and testing milestones and will provide further updates as work continues. The release was attached as Exhibit 99.1, and the company said a presentation discussing further details of the update was hosted on its investor relations website.

Dome Defect and Root Cause

In a seven-minute video update uploaded on October 14, 2026 and linked as the presentation replay from Rocket Lab’s investor presentations page, Chief Executive Officer Sir Peter Beck said the schedule change traces to the first stage’s propellant tank domes. He said the first Stage 1 tank, built earlier this year through a third-party manual hand-lay process, failed qualification, after which Rocket Lab pivoted to its long-term production process using an automated fiber placement machine that lays down carbon with speed and accuracy. According to Beck, the change also enabled design improvements only possible with that machine’s capabilities, including eliminating an insert and thickening sections of the aft and forward propellant domes on Neutron’s first stage to increase strength.

Beck said the company recently identified an issue with the manufacturing process for the propellant domes specifically, which delayed production while Rocket Lab investigated. During a recent inspection of a newly cured forward dome, he said, the company found voids — tiny air pockets that can form between layers of carbon fiber and compromise the strength, durability and reliability of the part. Beck said the voids did not necessarily mean the dome would fail in flight, but that the company’s practice is to proceed only when it believes the system has the appropriate margins. “Possible success isn’t our standard,” he said.

According to Beck, analysis and testing showed the company had been very close to getting the process right when the forward dome was built. However, a design change made after the Stage 1 qualification earlier this year deleted joints and increased the thickness of the carbon composite in some areas, and the voids formed in those thicker sections. He said the team was able to replicate the issue in testing and added mitigations to the manufacturing process to prevent the voids from appearing in the future. Beck described Neutron as the largest pressurized structure ever made from carbon composite and said that, because of its scale and the size limits of autoclaves, Rocket Lab had to develop new out-of-autoclave processes, including custom cure cycles for very large pieces such as the forward and aft domes for the Stage 1 propellant tanks.

Beck said the company has since run the aft dome through the corrected process, producing what he called “the highest quality carbon composite dome to date” and giving Rocket Lab complete confidence to move forward with the new forward dome. He said the process of making a new forward dome, combined with the time it took to investigate, identify and resolve the issue, pushed Neutron’s first launch date into next year.

Remaining Steps Before a New Target Date

Beck laid out three remaining steps before the company provides more granularity on a new target launch date. Step one, building the forward dome on the automated fiber placement machine, is already underway, he said. Step two is curing the dome and analyzing it with ultrasonic testing and other inspection methods to confirm there are no voids or further issues. Step three is assembling the forward and aft domes and components together to create the entire first stage, then running the hydrostatic test campaign followed by the cryogenic test campaign. Beck said Rocket Lab expects the first two steps to be completed before Q1 and the third wrapped up within that quarter, after which the company expects to be in good shape to share a new target launch date.

Beck said Rocket Lab is also using the time to bring forward upgrades to other parts of the vehicle that were planned for future flights, and that second and third Neutron rockets are already being built before flight one. He said the company will provide regular progress updates on its website and social media channels, telling viewers he would rather show real-time progress than give a date he might have to walk back.

The revision is the second schedule change Rocket Lab has publicly tied to Neutron’s first-stage tank. In its Q4 2025 investor update on February 26, 2026, the company disclosed that the Stage 1 tank ruptured during a hydrostatic pressure trial in January 2026 after reaching anticipated flight loads, and that an investigation identified a manufacturing defect that reduced strength at a critical join. That presentation said the first tank was manufactured by a third-party contractor using a manual hand-lay process, a scheduling decision designed to keep tank production going while the automated fiber placement machine was being commissioned, and that the next tank was already in production on the machine. At that point, Rocket Lab targeted Neutron’s first launch for Q4 2026. The same presentation said the Hungry Hippo fairing was qualified in Q4 2025, the thrust structure was qualified to withstand 2.1 million pounds of thrust, and Launch Complex 3 was complete.

In its Q2 2026 investor update on August 10, 2026, Rocket Lab said Stage 1 tank production was aligned with delivering Neutron to the launch pad in Q4 2026. That presentation reported more than 400 hotfire tests completed across Stage 1 and Stage 2 Archimedes engines and said Stage 2 and the thrust module were being prepared to ship to Launch Complex 3 for the final test campaign before first launch.

The August presentation also listed booked Neutron demand: one launch for Kepler Communications launching no earlier than 2028, seven launches for confidential commercial customers, a dedicated launch carrying multiple Rocket Lab Flatellite spacecraft for the U.S. Space Force’s SB-AMTI program, National Security Space Launch provider status, a U.S. Air Force point-to-point delivery experiment, and Neutron capacity to be reserved for launching Iridium’s next-generation constellation once Rocket Lab’s acquisition of Iridium is complete. Beck said in the video update that there is significant demand for what Neutron has to offer, including some new contracts the company will be able to discuss soon, and that customers are choosing Neutron not just for a single launch but for multiple missions across long-term partnerships.