Rocket Lab tests reusable Archimedes engine for Neutron rocket

Rocket Lab has successfully completed a significant qualification test for its Archimedes engine, which is slated to power the company’s next-generation Neutron launch vehicle. This Rocket Lab Archimedes engine test involved a full-duration hot-fire of a second-stage Archimedes engine, lasting nearly 5.5 minutes, and marks a crucial step toward the Neutron rocket’s maiden flight. The test occurred at Rocket Lab’s Archimedes Test Complex, located at NASA’s Stennis Space Center in Mississippi.

The company announced the successful burn on July 13, emphasizing its role as «critical preparation for Neutron’s first flight.» While Rocket Lab continues its regular launch cadence with the Electron rocket, development for the Neutron launch vehicle has advanced, with a potential debut anticipated later this year.

Archimedes Engine Performance

The Archimedes engine is designed to deliver significant thrust, critical for the Neutron launch vehicle’s operational capabilities. The recent full-duration test simulated flight conditions for the second-stage engine, operating for approximately 5.5 minutes. This duration is typical for an upper-stage burn, intended to place payloads into orbit.

For the first stage of the Neutron rocket, eight Archimedes engines will be employed. Collectively, these engines are designed to generate nearly 1.5 million pounds of thrust at lift-off. This combined thrust output is a key factor in the Neutron’s capacity to deliver payloads to various orbital destinations.

Neutron Rocket Design and Reusability

The Neutron launch vehicle incorporates reusability features, akin to those seen in other modern launch systems. The first stage of Neutron is engineered for controlled return and landing, either at its launch site or on autonomous drone ships positioned at sea. This reusability is a core aspect of Rocket Lab’s strategy to reduce launch costs and increase flight frequency, aligning with broader industry trends toward sustainable space access.

Rocket Lab’s approach to reusability with Neutron positions it as a competitor in the medium-lift launch market. The ability to recover and reuse expensive booster stages is fundamental to improving the economics of space missions and developing more flexible launch manifests.

Comparing Neutron and Falcon 9

The performance characteristics of the Archimedes engine draw comparisons to established propulsion systems in the commercial space sector. Specifically, the thrust output of each individual Archimedes engine is considered comparable to that of a Merlin 1D engine, which powers the first stage of SpaceX’s Falcon 9 rocket. This comparison provides a benchmark for understanding the power class of the Archimedes engine.

Like the Falcon 9, the Neutron launch vehicle is also designed with partial reusability in mind for its first stage. This strategic choice by Rocket Lab reflects a shared industry understanding of the economic advantages offered by reusable rocket technology to reduce the overall cost per launch kilogram. While both rockets prioritize first-stage reusability, Neutron also presents distinct innovations in its second-stage design and fairing mechanism, differentiating its overall operational profile.

The Unique ‘Hungry Hippo’ Fairing

A notable design feature of the Neutron rocket is its second-stage fairing system, which departs from conventional practices. Traditional launch vehicles typically release fairing halves that completely detach from the rocket once it has ascended beyond the dense layers of the atmosphere, allowing them to fall back to Earth.

In contrast, Neutron’s fairing halves are designed to separate like a «clam shell.» This innovative system, dubbed the «Hungry Hippo» by Rocket Lab, aims to prevent the fairings from becoming expendable components. By retaining the fairings and potentially integrating them into the reusable architecture, this design could contribute to further cost efficiencies and reduced space debris.

Implications for Commercial Space

The successful test of the Rocket Lab Archimedes engine test is a critical milestone for the Neutron launch vehicle, signaling its progression toward operational readiness. When operational, Neutron is expected to serve a range of commercial use cases, including satellite deployment for various purposes such as communications, Earth observation, and scientific missions.

The introduction of the Neutron rocket is poised to increase competitive options in the medium-lift launch sector, which traditionally supports a broad spectrum of missions. Its reusability features, coupled with the distinctive fairing design, could offer competitive advantages in terms of cost and mission flexibility. As launch capabilities expand, the market for deploying larger constellations, resupplying orbital platforms, and undertaking more complex deep-space missions continues to grow. The Neutron launch vehicle, if successful, could contribute to this evolving landscape, offering a new alternative for customers seeking reliable and cost-effective access to space.

Frequently Asked Questions

What is the Archimedes engine?

The Archimedes engine is Rocket Lab’s next-generation rocket engine designed to power the Neutron launch vehicle. It recently underwent a full-duration hot-fire test, simulating flight conditions for its second-stage variant.

What makes the Neutron rocket reusable?

The Neutron rocket achieves reusability primarily through its first stage, which is designed to return for landing either at the launch site or on a drone ship at sea. Additionally, its unique «Hungry Hippo» fairing system is designed to separate like a clam shell, potentially integrating into the reusable architecture rather than being jettisoned completely.

When is Neutron’s first flight expected?

Rocket Lab has indicated that the Neutron launch vehicle’s first flight could potentially occur later this year, following successful completion of critical qualification tests like the recent Archimedes engine burn.

The progress on the Rocket Lab Archimedes engine test and the ongoing development of the Neutron launch vehicle indicate Rocket Lab’s commitment to expanding its capabilities beyond small-lift launches. With its focus on reusability and innovative design elements, Neutron is positioned to address the growing demand in the medium-lift launch market, potentially offering a valuable new asset to the commercial space industry. Source.