Nammo UK Wins Main Engine Supplier For ESA Argonaut Lunar Lander

The announcement was confirmed on Thursday 20^th November at ESA’s European Astronaut Centre in Cologne, Germany, at a signing ceremony with Daniel Neuenschwander, Director of Human and Robotic Exploration of ESA, Robert Selby, Vice President of Nammo Space,  Giampiero di Paolo, Deputy CEO of Thales Alenia Space Italy, Chiara Pedersoli, CEO of OHB System AG, Yvan Baillion, Director of European Business at Thales Alenia Space and Richard Thorburn, CEO of Thales Alenia Space UK.

Nammo UK’s next generation high-performance bi-propellant engine named RELIANCE with a thrust capability of 6kN will support Europe’s first ever lunar lander mission as part the NASA Artemis programme planned for 2031. Nammo UK is a market leader for design, testing and manufacturing of spacecraft and launcher propulsion technology.

Nammo’s RELIANCE Lunar Descent Engine

ESA’s autonomous Argonaut Lunar Lander powered by RELIANCE will support NASA’s Artemis program with plans to re-establish a human presence on the Moon for the first time since the Apollo mission in 1972. Argonaut will play a key role in international lunar exploration and transporting a variety of cargo, including vital resources for astronauts such as food, water, science instruments and infrastructures for communications and power generation.

ESA’s Argonaut Lunar Lander

The development of RELIANCE – Rocket Engine for Lunar and Interplanetary Anglo-Norwegian Commercial Exploitation – marks a major milestone in European space propulsion. Under development at Nammo UK’s facility in Westcott, the 6kN engine features a large range throttleable design using a pintle injector, drawing inspiration from the original Apollo program. This feature, combined with the integrated engine controller, offers enhanced mission control needed for precision during landings. It also utilises hypergolic propellants and draws on Nammo UK’s rich heritage in the LEROS engine range.

RELIANCE builds on the success of many lunar and interplanetary missions powered by the work of Nammo UK. In March of 2025, Firefly Aerospace successfully landed the first ever commercial lunar lander, Blue Ghost. This spacecraft was powered by Nammo’s LEROS 4 engine, the development funded by the UKSA and NASA’s Commercial Lunar Payload Services (CLPS) initiative. NASA’s JUNO mission to explore the depths of Jupiter, solely relied on Nammo UK’s LEROS 1b engine for its propulsion system. At the time the LEROS 1b set the record for the fastest man-made object, achieving speeds of 230,00 mph. Recently, Nammo UK supplied the propulsion system for Astroscale’s ADRAS-J, which successfully took the world’s first image of space debris, as part of their space sustainability program.

Nammo UK is part of the Norwegian international aerospace and defence group Nammo, with the Space division operating across four sites based at Westcott Venture Park and Cheltenham in the UK, Raufoss in Norway and Dublin in Ireland. The group is involved in the continual development and qualification of new, innovative products for the global spacecraft and launcher propulsion sector.

The announcement with ESA coincided with Nammo UK exhibiting at Europe’s biggest space industry event, Space Tech Expo Europe in Bremen, 18-20 Nov, showcasing RELIANCE propulsion technology to over 10,000 attendees.

Contacts for further information:

Jade Bell- Marketing and Comms Nammo UK

E: jade.bell@nammo.com

Ben Smith- Stellar Space Consulting

E: ben@stellarspacemarketing.com