Rocket Lab has once again postponed the inaugural launch of its medium-class Neutron rocket, pushing the estimated debut window to 2027. According to CEO Peter Beck, the delay was caused by defects in the carbon-composite elements of the first-stage fuel tank, which forced developers to overhaul their manufacturing technology and re-test the problematic components. This is not the first schedule adjustment: the first flight of Neutron was originally slated for 2024, after which the date was pushed back multiple times.
Reason for the Delay: Voids in Composite Dome Layers
As Beck explained, the first-stage fuel tank failed qualification tests due to errors made by an outside contractor. The company shifted to in-house manufacturing, and while the process initially went smoothly, an issue arose at one stage regarding the production of the fuel tank dome. Specifically, voids formed within the layers of the carbon composite during the material's layup and curing process. According to Beck, such defects «do not necessarily mean the dome would fail in flight,» but they reduce the structural safety margin, prompting the company not to risk the rocket's reliability and to adjust the technological process. Management stated that a new solution has already been found and applied, including in the manufacturing of the aft dome, the quality of which the company noted was the highest ever achieved with such composite elements.
New Timeline: Testing Through the End of Q1 2027
In August 2026, Rocket Lab stated its intention to roll the rocket out to the launch pad in the fourth quarter of this year. However, according to Beck, a launch in early 2027 is unlikely: the company plans to complete testing of the problematic components by the end of the first quarter of 2027, and only after this phase concludes will a new specific launch date be set. Thus, even with the technical solution in place, the Neutron debut is pushed back by at least several quarters compared to previous plans.
Context: What is Neutron and Why Are Timelines Slipping?
Neutron is an upcoming partially reusable rocket standing about 42 meters tall, designed to deliver payloads to low Earth orbit. The dome-shaped elements of its fuel tanks, which hold liquid oxygen and liquid methane, are manufactured from carbon composite using an automated machine that lays down fibers at high speed and precision. It was during the curing stage of one of the recently manufactured domes that specialists discovered voids between the material layers. The repeated delays of the debut—from 2024 to 2026, and now to 2027—reflect industry-wide risks associated with debugging new large-diameter composite tank technologies, where sealing and structural margin requirements are critical.
Market Reaction: Shares Drop Following the Announcement
Against the backdrop of the launch delay news, Rocket Lab's stock saw a noticeable decline. According to 3DNews, the day before the announcement, shares traded around $63, but closed at approximately $53 per share following the publication of the statement; several financial publications estimated the daily drop at around 9%. Chief Financial Officer Adam Spice had previously expressed hope for a prompt maiden flight, but a specific new date, as noted, will only be named after component testing concludes in the first quarter of 2027.
