Mega Constellation Launcher

13,000 Kilograms To LEO
1,500 Kilograms To Mars/Venus
Reusable Launch Again And Again

Your mission, your way

Reliable and cost-effective launch services for constellation deployment,
cargo resupply, interplanetary missions.


43 m / 141 ft
Fairing Diameter
Payload To LEO
13,000 kg
Lift Off Mass
480,000 kg
LOX / Methane


  • Designed for mega constellation deployment, deep space missions, and human spaceflight
  • Efficient reusability - return to launch site
  • Captive fairing design allows for fully reusable first stage
    and fairing
  • Lightweight specially formulated Rocket Lab carbon composite structure
neutron deploy front


Neutron will feature the new Archimedes Engine


First Stage
  • 9 Archimedes Engines
  • Lox/Methane Oxidizer Rich Closed Cycle
  • Total Lift-off Thrust: 1,485,000 lbf
Second Stage
  • Single Vacuum Archimedes Engine
  • Lox/Methane Oxidizer Rich Closed Cycle
  • Vacuum Thrust: 890 kN (200,000 lbf)
neutron blue flame

Path to Lift-Off

Stage 2 Build
COMPLETE: First full-scale carbon composite tank built using advanced manufacturing methods
Structural and Cryogenic Testing
COMPLETE: Neutron’s carbon composite second stage to complete a barrage of structural tests in preparation for flight.
Flight Mechanisms Test Program
Testing of critical flight mechanisms including separation systems, fairing actuation, control surfaces and actuators.
Archimedes Engine Build
COMPLETE: First Archimedes development engine completed.
Hardware-in-the-Loop Flight to Orbit
COMPLETE: Testing of all avionics and communications devices with critical onboard software and GNC algorithms.
First Archimedes Engine Hot Fire
Archimedes to breathe fire at Rocket Lab’s Propulsion Test Complex within NASA Stennis Space Center.
Stage 1 Build
Full-scale carbon composite stage 1 tank built using advanced manufacturing methods.
Stage 2 Static Fire
Hot fire exercising the Archimedes engine and all second stage systems. Testing like we would fly.
Stage 1 Static Fire
Hot fire exercising the cluster of 9 x Archimedes engine and all first stage systems. Testing like we would fly.
Launch Complex 3 Complete
Neutron’s launch site at the Mid-Atlantic Regional Spaceport within NASA’s Wallops Flight Facility in Virginia complete.
Final Integration
Full flight vehicle complete and ready for flight.
Wet Dress Rehearsal
Final systems checks before first launch.
Neutron will take to the skies, ushering in a new era of space access.

Where we're building,
testing and launching Neutron.

Neutron Production Complex

Located within the Mid-Atlantic Regional Spaceport on Virginia’s Eastern Shore, the Neutron Production Complex is home to rocket production, assembly, and integration. The 250,000 square foot state-of-the-art complex will be constructed on a 28-acre site adjacent to the Wallops Island Flight Facility and will include a Launch Control Center for launch activities and on-orbit operations. This complex is supported by Archimedes engine production at Rocket Lab’s Headquarters and Production Complex in Long Beach, California.

Rocket Lab LC 2 web

Archimedes Engine Test Complex

The Archimedes Test Complex is located across a 1 million square foot area at NASA’s Stennis Space Center and includes use and development of existing infrastructure of the A-3 Test Stand to develop and test Neutron’s Archimedes engines.

archimedes engine complex

Launch Site

Rocket Lab Launch Complex 3 is the dedicated launch site for Neutron. It’s located at the Mid-Atlantic Regional Spaceport within NASA’s Wallops Flight Facility on Virginia’s Eastern Shore. Neutron’s pad is adjacent to the existing Rocket Lab Launch Complex 2, the U.S. launch site for Electron. As a reusable rocket, Neutron’s first stage can support return to launch site and downrange landing options, before return to Launch Complex 3 for refurbishment and reflight.

neutron launch site