Neutron is Rocket Lab’s two-stage, medium-lift orbital rocket now in development. Its first stage is designed to return to Earth as one reusable assembly with the interstage and payload fairing still attached, while its carbon-composite second stage is discarded after each mission. Nine methane-and-liquid-oxygen Archimedes engines power the first stage; a vacuum-optimized Archimedes powers the second. Rocket Lab’s latest company target is an inaugural launch in 2027, subject to qualification testing and manufacturing progress.
What Neutron is designed to do
Neutron is intended for missions that need more capacity than a small launcher but do not require the very largest orbital vehicle. Rocket Lab describes it as a commercial constellation and national-security launcher, with planned applications for civil spacecraft and, later, lunar, Mars, cargo and possible human-spaceflight missions. Those future roles are goals rather than demonstrated capabilities: Neutron has not yet flown an orbital mission as of October 18, 2026.
As an Amazon Associate I earn from qualifying purchases.
The vehicle uses carbon-composite structures in both stages. Carbon composite can provide a high strength-to-mass ratio, but it also has to survive demanding cryogenic loading, vibration and, for the first stage, atmospheric re-entry. Neutron’s design therefore treats recovery hardware, thermal protection and the fairing as parts of the launch system rather than disposable add-ons.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Which parts are reusable?
Stage 1 returns with the fairing attached
Rocket Lab’s Payload User Guide says the first stage is intended to return as a single assembly that includes the extended interstage and a captive payload fairing. The fairing is not jettisoned and recovered as two separate halves; it remains attached to the returning booster. Reusing that assembly is meant to reduce refurbishment and recovery complexity compared with a design that must find, inspect and refit separate fairing sections after every flight.
#1 Best Overall
- BEGINNER MODEL-ROCKET LAUNCH SET: The Tandem-X rocket-model launch set offers adults and kids ages 10+ hours of fun during the holidays as they complete and launch our Amazon and Crossfire ISX rocket models. This set includes the easy-to-assemble Amazon model parts, the Crossfire ISX model parts, parachutes, and the launch pad system. It requires rocket engines, Starters, Recovery Wadding, and 4 high-quality 1.5-volt AA alkaline batteries for launch use (sold separately).
- 2 SOARING ALTITUDE HEIGHTS: Our Tandem X set offers a high-performing power duo with our giant 30-inch Amazon model (600-foot projected altitude with a C6-5 rocket engine) and our streamlined 15.6-inch Crossfire ISX model (1,150-foot projected altitude with a C6-7 rocket engine). Other compatible Estes model-rocket engines for Amazon model: B4-2, B4-4, B6-2, B6-4, C5-3, and C6-3. Other compatible engines for Crossfire ISX: A8-3, B4-4, B6-4, and C6-5. All engines sold separately.
- READY TO ASSEMBLE: Our beginner model-rocket launch set comes with 2 build options. The precolored Amazon model features plastic fins and self-stick graphics and can be built in an hour. The Crossfire ISX model comes with laser-cut wood fins, self-stick decals, and aerodynamic parts. Pair the rockets with the included Porta Pad II Launch Pad and Electron Beam Launch Controller for a hands-on educational activity or a unique Christmas gift for a budding scientist or a space aficionado.
- SAFETY FIRST, FUN ALWAYS: Our rockets and rocket launch accessories are designed to be used with the NAR (National Association of Rocketry) model-rocket safety code. Always ensure you have an appropriate launch site, stand back at least 15 ft., insert the safety key, issue a countdown, and then you can let your rocket fly!
- WE IGNITE IMAGINATIONS: Since 1958, Estes has created educational rocket kits and displays designed for an unforgettable aerospace experience. As a family-owned company, we have grown to offer exciting STEM products that engage aspiring rocketeers and the future minds of aerospace.
The first stage uses a tapered lifting-body shape, forward canards and landing legs. Those features help control its attitude and lift during atmospheric descent. A low ballistic coefficient reduces the rate at which the stage loses altitude and limits heating and aerodynamic loads while it is coming back through the atmosphere.
Stage 2 is expended
The second stage is also carbon composite, but it is not reusable in the published configuration. It accelerates the payload to its target orbit after first-stage separation and is then left in space or disposed of according to the mission profile. Neutron is therefore a partially reusable launch vehicle, not a fully reusable two-stage system.
Thermal protection is part of the recovery system
A reusable thermal-protection system on the thrust structure is intended to withstand the heating experienced during re-entry. The protection must preserve the engine section and surrounding structure for another flight, while the landing hardware has to tolerate the mechanical loads of touchdown. Qualification testing will determine how the production system performs; published design intent is not the same as flight heritage.
Recommended Free Tools
How Neutron lands
Return to Launch Site (RTLS)
After the first stage separates from the second stage, Neutron can reserve enough propellant and aerodynamic performance to fly back toward Virginia. In an RTLS profile, the stage returns to Launch Complex 3 (LC-3) at the Mid-Atlantic Regional Spaceport on Wallops Island. It performs a controlled descent and propulsive landing using its landing legs and onboard guidance.
RTLS is operationally attractive because the stage comes back to the launch area, where ground equipment and inspection facilities can be concentrated. The price is payload performance: flying back to the pad consumes propellant and requires the rocket to carry the energy needed for the return.
Rank #2
- BEGINNER MODEL ROCKET LAUNCH SET: The Estes Alpha III launch set lets kids ages 10+ and hobbyists easily build and launch this iconic model rocket. The model rocket kit includes rocket parts, engine mount, decals, a parachute, a launch pad system, and instructions. For blastoff, you’ll need Estes rocket engines, Starters, Recovery Wadding, and 4 high-quality 1.5-volt AA alkaline batteries (not included).
- SOARS UP TO 1,150 FT.: Our Alpha III model rocket is designed for first-time STEM kit builders and climbs up to a projected altitude of 1,150 ft. (351 m). It’s compatible with 1/2A6-2, A8-3, A8-5, B4-4, B6-4, B6-6, C6-5, or C6-7 Estes rocket engines (sold separately).
- READY TO ASSEMBLE: Rocket building sparks creativity and a love for science and outer space! This beginner Alpha III model kit is easily put together with 1 hour of preparation and includes decals. It comes with a Porta-Pad II Launch Pad and Electron Beam Launch Controller for an unforgettable blastoff for first-time rocketeers.
- SAFETY FIRST, FUN ALWAYS: Our rockets are designed to be used with the NAR (National Association of Rocketry) model-rocket safety code. Always ensure you have an appropriate launch site, stand back at least 15 ft., insert the safety key, issue a countdown, and then you can let your rocket fly!
- ESTES EDUCATION: Since 1958, Estes has created educational rocket kits designed for an unforgettable launch experience. As a family-owned, US-based company, we offer exciting and engaging STEM products for all interests, skills, and power levels.
Down Range Landing (DRL)
For missions that need more payload capacity, Rocket Lab plans a Down Range Landing. Instead of spending fuel to reverse course to Virginia, the first stage flies downrange and lands propulsively on a marine platform. The shorter return maneuver leaves more performance available for the payload.
Rocket Lab calls the planned recovery platform “Return On Investment.” It is a modified 400-foot (122-meter) barge equipped with autonomous ground-support equipment to capture and secure the landed stage, blast shielding, and station-keeping thrusters for precise positioning. The platform is intended to remain stable under the weather and sea conditions expected during recovery, but actual operating limits will depend on qualification and mission rules.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhy the two landing choices matter
| Recovery profile | Landing location | Payload-performance effect | Operational trade-off |
|---|---|---|---|
| RTLS | Launch Complex 3, Wallops Island, Virginia | Lower than a downrange landing because the stage must fly back | Returns the stage to the launch site and avoids an ocean recovery voyage |
| DRL | “Return On Investment” marine platform | Higher, because less propellant is spent reversing course | Requires a barge, autonomous capture equipment, weather planning and marine operations |
What engines does Neutron use?
Archimedes propellant and cycle
Neutron’s Archimedes engine burns liquid methane with liquid oxygen (LOX) in an oxidizer-rich staged-combustion cycle. Rocket Lab says the engine is intended to be reusable, partly 3D printed and designed for lower operating stress to support repeated firings.
Methane occupies a middle ground between kerosene-based RP-1 and liquid hydrogen. According to Rocket Lab’s Payload User Guide, methane can deliver higher specific impulse than RP-1 without imposing the large vehicle-size penalty associated with liquid hydrogen. The choice also has to support a reusable engine and a vehicle that stores cryogenic propellants through launch and recovery operations.
First-stage propulsion
Nine sea-level Archimedes engines power Stage 1. The guide lists up to 165,000 pounds-force (733 kilonewtons) per engine and 1,450,000 pounds-force total for the nine-engine first stage. Rocket Lab’s published dimensions and performance page rounds the first-stage total to 6,600 kN at sea level. The two figures use different unit presentations and should be read as the company’s published per-engine and aggregate specifications rather than as an independently measured flight result.
Rank #3
- BEGINNER MODEL ROCKET SET: The Estes Athena model rocket gives kids ages 10+ and beginners an easy way to experience real rocket launches with no building required! This ready-to-fly model rocket kit includes a fully prepared rocket with a parachute. This rocket requires Estes rocket engines, a launch pad system, Starters, Recovery Wadding, and 4 high-quality 1.5-volt AA alkaline batteries (sold separately) for launch use.
- SOARS UP TO 1,125 FT.: Our high-flying Athena rocket features a bright 12-inch parachute for safe recovery and soars up to a projected altitude of 1,125 ft. (343 m) with a C6-7 engine (sold separately). It is also compatible with the A8-3, B4-4, B6-4, and C6-5 rocket engines.
- READY TO FLY: Rocket-building kits are creative, educational gift ideas for Christmas or special-occasion surprises! This beginner-friendly Athena rocket comes fully assembled and just takes 15 minutes of preparation time. This model pairs with the Porta Pad II Launch Pad and Electron Beam Launch Controller (sold separately) for blastoff.SAFETY FIRST, FUN ALWAYS: Our rockets are designed to be used with the NAR (National Association of Rocketry) model-rocket safety code. Always ensure you have an appropriate launch site, stand back at least 15 ft., insert the safety key, issue a countdown, and then you can let your rocket fly!
- SAFETY FIRST, FUN ALWAYS: Our rockets are designed to be used with the NAR (National Association of Rocketry) model-rocket safety code. Always ensure you have an appropriate launch site, stand back at least 15 ft., insert the safety key, issue a countdown, and then you can let your rocket fly!
- ESTES EDUCATION: Since 1958, Estes has created educational rocket kits designed for an unforgettable launch experience. As a family-owned, US-based company, we offer exciting and engaging STEM products for all interests, skills, and power levels.
Second-stage propulsion
Stage 2 uses one vacuum-optimized Archimedes engine. Its listed vacuum thrust is 900 kN. The engine is designed for operation after the atmosphere has thinned, where a larger nozzle can expand the exhaust more efficiently than a sea-level nozzle.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Throttle and restart capability
The Payload User Guide lists a minimum throttle level of 65% and restart capability for the engines on both stages. Throttling helps manage acceleration and loads during flight; restart capability supports mission sequencing and, on the first stage, can provide additional control during the landing burn. These are published capabilities, not yet flight-proven Neutron results.
Neutron’s published size and payload figures
The following values come from Rocket Lab’s Payload User Guide version 1.0, dated January 2025, except where noted. Dimensions describe the first and second stages separately, not the full stacked vehicle with its payload enclosure.
| Specification | Published value | Qualification |
|---|---|---|
| First-stage height | 42.8 m | Rocket Lab Payload User Guide v1.0, January 2025 |
| First-stage diameter | 7 m | Rocket Lab Payload User Guide v1.0, January 2025 |
| Second-stage height | 11.5 m | Rocket Lab Payload User Guide v1.0, January 2025 |
| Second-stage diameter | 4.9 m | Rocket Lab Payload User Guide v1.0, January 2025 |
| Stage 1 engines | 9 sea-level Archimedes engines | Published configuration |
| Stage 2 engine | 1 vacuum-optimized Archimedes engine | Published configuration |
| Stage 1 thrust | 6,600 kN at sea level | Rocket Lab published specification |
| Stage 2 thrust | 900 kN in vacuum | Rocket Lab published specification |
| Reusable-configuration payload to low Earth orbit | Approximately 13,000 kg | Rocket Lab current product information and a 2026 SEC filing; the value is an approximate company figure |
The approximately 13,000 kg low-Earth-orbit figure applies to the reusable configuration. The delivered payload for a particular mission will depend on orbit altitude and inclination, launch azimuth, recovery profile, reserves, spacecraft hardware and safety constraints. An RTLS mission generally gives up some payload performance compared with a downrange landing because of the return maneuver.
Where Neutron will launch and recover
LC-3 at the Mid-Atlantic Regional Spaceport on Wallops Island, Virginia, is Rocket Lab’s dedicated Neutron test, launch and landing site. The company says the complex supports return-to-Earth missions and represents the largest orbital-launch capacity in the spaceport’s history.
Rank #4
- ICONIC NASA ARTEMIS I ROCKET MODEL KIT - Recreate the historic Artemis I mission with this highly detailed 1:144 scale Space Launch System (SLS)—a must-have for space enthusiasts, collectors, and model builders.
- AUTHENTIC MULTI-STAGE DETAILING - Features twin solid rocket boosters, detailed core stage with external hydrogen lines, separate stage assembly, and four RS‑25 engines for a realistic, true-to-life build.
- IMPRESSIVE 28" DISPLAY CENTERPIECE - Standing nearly 28 inches tall, this model delivers a striking vertical display that commands attention in any room, office, or collection.
- SKILL LEVEL 4 – ADVANCED BUILD EXPERIENCE - Designed for experienced hobbyists ages 12+ seeking a challenging, rewarding project with intricate parts and detailed assembly.
- READY FOR CUSTOM PAINT FINISH - Molded in light gray plastic so you can paint and detail to your exact preferences for a museum-quality appearance. (Paint & glue required, not included.)
A site designed for both launch and landing allows the vehicle, pad systems and recovery operations to be developed together. It does not, however, make the rocket operational by itself. Flight qualification, range approval, production readiness, ground testing and mission certification still have to be completed.
When will Neutron launch?
Rocket Lab’s October 14, 2026 update says the inaugural Neutron launch is now expected in 2027. That is the current company expectation, not a guaranteed date. Earlier company announcements targeted 2025 or 2026 and are no longer current.
Rocket Lab’s June 30, 2026 SEC filing reports ongoing qualification testing, continued Archimedes testing, progress on the second stage and reusable fairing, and first-stage tank production aligned with delivery to the pad in the fourth quarter of 2026. The filing also cautions that exact launch timing depends on first-stage qualification and other critical tests.
- Current status: Neutron remains a development vehicle and has not begun orbital service.
- Latest stated target: inaugural launch in 2027.
- Schedule condition: qualification tests, engine work, stage and fairing progress, tank production and pad readiness must remain on track.
- How to interpret the date: treat 2027 as a planning target that can move, not as a fixed launch appointment.
Why the design is significant—and what remains unproven
Potential benefits
- Reusing the first stage and captive fairing could reduce the amount of flight hardware discarded per mission.
- A methane engine is intended to offer a useful performance and vehicle-sizing compromise while supporting repeated operation.
- RTLS and DRL profiles give mission planners a choice between simpler pad recovery and higher payload performance.
- A dedicated launch-and-landing complex could support a higher launch cadence once the vehicle is qualified.
Development challenges
- The carbon-composite first stage must survive ascent, cryogenic propellant loading, re-entry heating, aerodynamic forces and landing loads repeatedly.
- Nine engines must operate together on ascent, while the vacuum engine must perform reliably after stage separation and during any planned restart sequence.
- A marine landing adds weather, range, ship-positioning and stage-capture constraints even when it improves payload performance.
- Published payload, thrust and reuse figures describe the planned vehicle. They are not substitutes for orbital flight data, turnaround demonstrations or an established launch cadence.
Rocket Lab CEO Sir Peter Beck said at the August 28, 2025 LC-3 opening that Neutron is intended to provide responsive space access with a high-cadence reusable launch vehicle, serving low Earth orbit and the International Space Station and eventually missions to the Moon and Mars. That statement describes the program’s intended scope; the vehicle’s operational maturity will be established only through testing and flights.
How to evaluate Neutron against another launcher
A meaningful comparison should use the same mission assumptions on both vehicles. Check these points rather than comparing headline lift numbers alone:
Best Value
- BEGINNER MODEL ROCKET LAUNCH SET: This Estes rocket model launch set offers kids ages 10+ the chance to blast off our 2 ready-to-fly 1499 Rascal and Hijinks models—no building required! This set includes the fully assembled 1499 Rascal and Hijinks rocket models, parachutes, and the launch pad system. It requires rocket engines, Starters, Recovery Wadding, and 4 high-quality 1.5-volt AA alkaline batteries for launch use (sold separately).
- SOAR UP TO 1,100 FT.: Our 1499 Rascal and Hijinks model rockets help you reach the skies faster with the included Estes rocket launch pad system. They have a projected altitude of 1,100 ft. (335 m) when used with a C6-7 Estes model-rocket engine (sold separately). They are also compatible with A8-3, B4-4, B6-4, C6-5, or A10-3T rocket engines.
- READY TO FLY: Rocket launch sets are creative, educational gift ideas for Christmas day or special-occasion surprises! Our dual beginner rocket launch set comes decorated and ready to launch with the included Porta Pad II Launch Pad and Electron Beam Launch Controller. Get outside faster and prepare for a successful and memorable blastoff!
- SAFETY FIRST, FUN ALWAYS: Our rockets are designed to be used with the NAR (National Association of Rocketry) model-rocket safety code. Always ensure you have an appropriate launch site, stand back at least 15 ft., insert the safety key, issue a countdown, and then you can let your rocket fly!
- WE IGNITE IMAGINATIONS: Since 1958, Estes has created educational rocket kits designed for an unforgettable launch experience. As a family-owned company, we have grown to offer exciting STEM products that engage aspiring rocketeers and the future minds of aerospace.
- Reusable elements: identify whether the first stage, fairing, second stage or entire vehicle is designed for reuse.
- Target orbit: compare payload to the same altitude and inclination, not simply “low Earth orbit” as a generic label.
- Recovery mode: note whether the stage returns to land, lands downrange on a platform or is discarded.
- Propellant and engine cycle: compare methane/LOX and staged combustion with the other launcher’s propellants, cycle and engine count.
- Operational status: separate a flown, scheduled service from a vehicle still in qualification.
- Schedule maturity: treat a stated target date differently from a demonstrated launch cadence.
Quick answers
Is Neutron reusable?
Partly. Stage 1 and its captive payload fairing are designed for reuse. Stage 2 is expended after the mission.
How does Neutron land?
It can target an RTLS landing at LC-3 in Virginia or a propulsive downrange landing on the planned “Return On Investment” barge. The downrange option preserves more payload performance.
How much can Neutron carry?
Rocket Lab publishes an approximate reusable-configuration capacity of 13,000 kg to low Earth orbit. Actual capacity varies with orbit and recovery profile.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →What fuel does it use?
Archimedes burns liquid methane and liquid oxygen in an oxidizer-rich staged-combustion cycle.
Is Neutron flying now?
No. As of October 18, 2026, it is still in development, with an inaugural launch expected in 2027 if qualification and manufacturing work stay on schedule.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
