Rocket Lab Pushes Neutron to 2027 Over Air Bubbles in Tank
Tiny air bubbles — the kind of flaw you might find in a poorly poured resin countertop — just cost Rocket Lab at least three months, roughly a tenth of its market value, and another chunk of its credibility with investors. The company confirmed Wednesday, after the market closed, that the first flight of its Neutron rocket will not happen this year. It is now "expected to occur in 2027."
The gut-punch detail is this: engineers found voids, microscopic pockets of trapped air, inside the carbon-composite layers of a brand-new propellant tank dome. The dome might have flown anyway. CEO Peter Beck said so himself. But "might" is not a word he is willing to stake a $50-million-per-launch rocket on, so Rocket Lab is building the dome again — and the launch date, whenever it lands, will come only after the whole first-stage tank survives pressure and cryogenic testing all over again.
File illustration: a 3D rendering of Rocket Lab's Neutron, the medium-lift rocket whose maiden flight has slipped from Q4 2026 to 2027. (Image: Cybertron42 via Wikimedia Commons, CC BY-SA 4.0)
A $50 million rocket, held up by air bubbles
Wednesday's update landed the way these things always do in this industry: a sober video from Beck — flat, matter-of-fact, the same unflustered cadence he brings to every earnings call, no spin on the slip — a technical explanation nobody can argue with, and a stock chart that argues with it anyway. Shares fell about 8 percent in the regular session, slid another 7 to 8 percent after hours — TradingView's Seeking Alpha feed put the extended-session drop at 7.3 percent — and then took another beating on Thursday, sinking as much as 16 percent intraday before clawing back to close down 6.64 percent at $55.25.
The numbers are worth saying plainly. The Register pegged the slide as roughly $63 to $53 in after-hours trading. The Motley Fool, writing with the shares around $53, noted the stock sat about 65 percent below its May 27 record close of $150.23. Investopedia, in its October 16 update, said the shares had lost close to a quarter of their value this year and were sitting nearly 70 percent off that May record.
Analysts moved fast. KeyBanc cut its price target to $100 from $135 (keeping an overweight rating), and Clear Street's Greg Pendy trimmed his to $105 from $129 (keeping a buy), the Fool reported. Cantor Fitzgerald held at $122. If there is a silver lining, it is that the selling happened on open information — executives had warned a delay was possible, and CoinCentral noted the surprise was softened by that warning. The market sold anyway.
What broke, in plain English
A rocket's propellant tank is a giant pressure vessel. Neutron's is made of carbon composite — layers of carbon fibre glued together with resin — instead of the aluminium or steel almost everyone else uses. The cap at the top of that vessel is called the forward dome. After the tank's composite layers were laid down and baked hard in an autoclave, Rocket Lab's inspectors found voids: little air pockets trapped between the layers.
"They don't necessarily mean that the dome would fail in flight," Beck said in the video update, according to The Register. But they would reduce the structure's performance margins — the safety cushion between "holds together" and "doesn't" — and that was the end of the conversation.
"Possible success isn't our standard," Beck said. "Our practice is to proceed only when we believe the system has the appropriate margins."
Here is the awkward part. This dome was built with Rocket Lab's new in-house automated fiber placement machine — the expensive robot that was supposed to make everything more repeatable than human hands ever could. The thicker composite sections the new machine enabled, NASASpaceflight explained, are precisely where the voids formed: thicker sections are harder to cure cleanly, because heat and pressure have to force the resin all the way through the layers and drive the trapped air out. Rocket Lab says it has replicated the defect in testing, identified the fix, and reworked the process. A replacement dome is being built — the company has described it internally as the highest-quality dome it has ever made, Morningstar reported.
This was not the first rupture
To understand why Beck sounds so determined to get the process right this time, rewind to the night of January 21. That evening, the first full-size Neutron Stage 1 tank — built not by Rocket Lab but by a third-party contractor, using slow, error-prone manual hand-layup as a schedule workaround — ruptured during hydrostatic testing. Hydrostatic testing means filling the tank with water and pressurising it. The tank was supposed to prove the design. Instead it burst.
Beck blamed the third-party hand-layup process outright. The Q4 2026 target that stood until this week dated only to February, set in the aftermath of that rupture. And on the August 10 earnings call, Beck had already signalled the obvious: "the window for an end-of-year launch is narrowing." The window is now shut. The tank that ruptured in January is history; the dome with the voids is its replacement's replacement. This is the second time the same class of hardware — a first-stage carbon-composite tank structure — has failed a quality gate in nine months.
Wall Street did the math — and sold
Neutron is not just a rocket to Rocket Lab's investors. It is the company's entire growth story in a 43-metre package. The Motley Fool's framing was the sharpest of the week: management has said adjusted EBITDA — the company's measure of operating profitability — should turn positive in the quarter after Neutron's first successful launch. Every quarter the launch slips is a quarter that milestone slips.
The underlying business, to be fair, is not a smouldering wreck. Rocket Lab posted record second-quarter revenue of $234 million, up 62 percent year over year, with a $2.36 billion backlog, CoinCentral reported — and the Fool separately confirmed the backlog figure. The U.S. Space Force has Neutron-adjacent money on the table: a contract worth up to $397 million for Flatellite spacecraft, and another worth up to $266 million for suborbital missile-defence launches. There is also a planned Iridium purchase expected to close in 2027. In May, the company announced its largest launch deal ever — five Neutron and three Electron missions for an undisclosed customer between 2026 and 2029, a contract that now depends on a working Neutron.
File photo: Rocket Lab founder and CEO Peter Beck (right) on stage at TechCrunch Disrupt 2024 in October 2024 — well before this week's announcement. (Photo: TechCrunch / Katelyn Tucker–Slava Blazer Photography via Wikimedia Commons, CC BY 2.0)
The carbon-fibre question nobody can dodge anymore
Strip away the earnings-call choreography and this is really a story about a material. Carbon composite is, by weight, absurdly strong — a kilogram of it outperforms a kilogram of aluminium or steel. That is why Rocket Lab's small Electron, the first carbon-fibre rocket to reach orbit back in 2018, has flown nearly 100 times with a 96 percent success rate. Mass you save on the structure becomes payload you can sell.
But nobody has ever qualified a pressurised carbon-composite structure the size of Neutron's first-stage tank. NASASpaceflight, which published the best technical autopsy of the week, noted that most launch-vehicle builders stick to steel or aluminium for primary structures — and that Rocket Lab is now "working to qualify the largest pressurized structure yet built from carbon composite." The material behaves beautifully at small scale and turns ornery at large scale: layup orientation, fibre volume fraction, cure cycles — every variable gets harder as the part gets thicker.
And here is the detail that should make everyone in Long Beach a little uneasy: the industry's most successful rocket builder already made this call and walked the other way. SpaceX originally planned to build Starship — then called the Big Falcon Rocket — out of carbon fibre. It switched to steel: cheaper, easier to repair, stronger at cryogenic temperatures. The history rhymes uncomfortably: the X-33's composite liquid-hydrogen tank failed in November 1999 after microcracking and manufacturing defects let the structure delaminate. Rocket Lab is attempting, at medium-lift scale, what has never been done before. The voids are what "never been done before" looks like in practice.
The path from here to an actual launch date
Beck's version of the schedule, via the company's presentation, is that the replacement dome will be built and analysed for defects before the end of this year, and the complete Stage 1 tank will be assembled and put through its paces in the first quarter of 2027. Only after that testing finishes will Rocket Lab name a new target date for Flight 1. "We're balancing speed to first launch with bringing a reliable high-cadence rocket to market for the long term," Beck said, "which means making deliberate choices about timelines to support reliability going long into the future."
That is why the announcement says "expected to occur in 2027" and nothing more specific. After the 2024 → 2025 → 2026 sequence of slips, Beck clearly decided a wide window beats a third public date adjustment.
SpaceX reportedly wants to wind down Falcon 9 in favour of Starship, The Register noted — a gap Neutron is built to fill. Space startups banked a record $20.8 billion in the third quarter, and launch capacity is the bottleneck everyone is bidding against. Blue Origin wants a rocket every five minutes. SpaceX's $40 billion satellite-chip bet shows where the incumbent's attention is going. The market Neutron was built for is real and growing. The rocket just is not in it yet.
Our take: Beck was right to stop. The bet is still on.
Let us be blunt about the part of this story that deserves praise, because space journalism rarely hands it out: Beck's decision not to fly a compromised dome is exactly what a good rocket CEO does. Flying hardware with known-reduced margins is how you get a very expensive debris field over the Atlantic. "Possible success isn't our standard" is the sentence you want on the record from the person running your launch company.
But do not mistake an admirable decision for a resolved problem. The pattern of the last nine months is what should worry the bulls: a botched third-party hand-layup ruptured a tank in January, and now an in-house robot process — the supposedly repeatable, capital-intensive fix — has produced a different defect in a thicker section of the same class of hardware. Both times, the manufacturing was the problem, not the design. That is not a coincidence. It is what happens when you try to qualify the largest pressurised carbon-composite structure ever built on a startup timeline, and it suggests the schedule risk is not bad luck — it is structural. The carbon-fibre bet that makes Neutron special is the same bet that keeps delaying it, and every delay pushes the profitability milestone — positive adjusted EBITDA the quarter after first flight — further into a future investors have now waited through for five years.
Frequently asked questions
When will Rocket Lab's Neutron rocket launch now?
Rocket Lab says the first flight is "expected to occur in 2027," with no specific date. CEO Peter Beck expects the replacement dome to be built and inspected by end of 2026, and the Stage 1 tank's pressure and cryogenic testing to run through Q1 2027 — a firm date comes only after that.
Why was Neutron's first launch delayed?
Inspectors found voids — tiny trapped air pockets — in the carbon-composite layers of the newly built forward dome of the first-stage propellant tank. Beck said the voids would not necessarily have caused a failure but would have reduced performance margins, so the company is rebuilding the dome with a reworked manufacturing process.
How far has Rocket Lab stock fallen on the delay?
Shares dropped about 8 percent in Wednesday's regular session and a further 7–8 percent after hours (roughly $63 to $53, per The Register), then fell as much as 16 percent intraday Thursday before closing down 6.64 percent at $55.25. The stock sits roughly 65 percent below its May 27 record close of $150.23, per the Motley Fool.
Sources
This article was researched from reporting by The Register, NASASpaceflight, The Motley Fool, CoinCentral, TradingView (Seeking Alpha), Morningstar/MarketWatch, and Investopedia. We checked every fact against at least two of these outlets. We downloaded both photos used here and read their actual licence records on Wikimedia Commons ourselves before publishing — the credits above are the real ones, not guesses.
About the author: TechPulse USA Newsroom is our in-house reporting desk covering American tech, AI, space and markets — every story researched from multiple sources, every fact verified before it goes up. We check the boring details (licences, links, numbers) so you don't have to.
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