European Sovereignty Monitor

Defence and space

Zurich's Stellar Alpina raises CHF3.5 million for detonation rocket propulsion

Zurich's Stellar Alpina raised CHF3.5 million (about EUR3.8 million) pre-seed, led by Founderful, to build rotating detonation rocket engines for in-space mobility, after what it called Europe's first commercial hotfire campaign of the technology.

Verified Editor-read Stellar Alpina company release via GlobeNewswire, 28 May 2026

What it does not test. Does not confirm a flight contract or government customer for the propulsion technology.

How this item counts. No movement: no answer to who owns, who operates, whose law governs or who made the parts changes. Weight 0. CHF3.5m pre-seed for Swiss propulsion startup; no flight contract or government customer. European Sovereignty Index

How this item was made. Drafted by an AI system (Claude (Anthropic)) from the source cited above; read and approved by the editor on 2026-09-22. How the record is made

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