Stellar Alpina completed Europe’s first commercial RDRE hotfire and raises $4.5m within 82 days

Stellar Alpina has completed Europe’s first commercial rotating detonation rocket engine hotfire and raised USD 4.5 million in pre-seed funding within 82 days of incorporation.

The round was led by Founderful, with participation from LP&E and strategic investors backing the next generation of space infrastructure. For Stellar Alpina, the timing matters as much as the number: from incorporation to tested hardware in less than three months.

From incorporation to ignition

Stellar Alpina was founded to build a new class of in-space propulsion from Switzerland. Within 82 days, the team built the test infrastructure, prepared the first engine campaign, and completed a successful hotfire of a rotating detonation rocket engine.

That sequence reflects the operating culture behind the company: move fast enough to learn, build physical proof early, and keep the distance between ambition and hardware as short as possible.

The company’s first milestone is not a slide deck, a simulation, or a future promise. It is tested hardware.

The bottleneck after launch

Launch is becoming cheaper and more frequent. More satellites, vehicles, and infrastructure can now reach orbit than ever before. But once assets are in space, moving them to where they actually need to operate remains a major constraint.

Today, much of that mobility still depends on propulsion architectures that have changed only incrementally over decades. For orbital logistics, high-energy transfers, and future lunar infrastructure, that creates a bottleneck.

Stellar Alpina is building for that layer: the space between launch and destination.

Why rotating detonation propulsion

Rotating detonation rocket engines use controlled detonations to generate thrust. The architecture has the potential to offer higher performance, fewer mechanical components, and substantially reduced system volume compared with conventional approaches.

For in-space mobility, those advantages matter. Every kilogram, every cubic centimetre, and every moving part affects what missions can do, how fast they can iterate, and how far they can go.

Stellar Alpina is developing detonation-based propulsion as the foundation for a broader architecture: high-performance engines, modular in-space vehicles, and eventually lunar delivery systems.

Building from Switzerland

The hotfire and funding round mark an early step toward a larger ambition: proving that serious upstream space hardware can be built from Zurich.

Switzerland brings a rare combination of precision engineering, industrial trust, research excellence, manufacturing depth, and long-term institutional stability. Stellar Alpina exists to translate that foundation into flight-capable systems.

The company is still at the beginning. But the signal is clear: Switzerland is no longer only contributing components, research, or services to the global space economy.

It is building the hardware that moves missions forward.

Onwards

The pre-seed round gives Stellar Alpina the resources to continue development, expand its team, deepen its test capability, and move from first proof toward a new mobility layer for space.

The mission ahead remains difficult. But the first answer has already been given in metal, pressure, flame, and data.

82 days from incorporation to engine hotfire.

Now the work continues.