Stellar Alpina
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Founders
About
Stellar Alpina is a Zurich-based space-propulsion company building compact rotating detonation rocket engines (RDREs) for in-space mobility, founded in 2026 by Rick Röthlisberger, Simi Y. Wespi, Victor Elliesen, and Patrick Egli — all alumni of ARIS (Academic Spaceflight Initiative Switzerland) 123. Just 82 days after incorporation, Stellar Alpina completed what it claims is Europe’s first commercial RDRE hotfire campaign with eight detonative hotfires producing footage of up to five stable detonation waves 12. The CHF 3.5M (~€3.8M / ~$4.5M) pre-seed announced May 28, 2026 was led by Founderful with participation from LP&E 123.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-05-28 | Pre-Seed | CHF 3.5M (~€3.8M / ~$4.5M) | Founderful | LP&E 123 |
What Investors Say
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What Founders Say
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Sources
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GlobeNewsWire, “Stellar Alpina Raises CHF 3.5M to Build Detonation-Based Propulsion for Mobility After Launch,” May 28, 2026. Accessed May 2026. https://www.globenewswire.com/news-release/2026/05/28/3302542/0/en/stellar-alpina-raises-chf-3-5m-to-build-detonation-based-propulsion-for-mobility-after-launch.html↩↩↩↩
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EU-Startups, “Zurich’s Stellar Alpina raises €3.8 million to build detonation-based propulsion for in-space mobility,” May 28, 2026. Accessed May 2026. https://www.eu-startups.com/2026/05/zurichs-stellar-alpina-raises-e3-8-million-to-build-detonation-based-propulsion-for-in-space-mobility↩↩↩↩
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Payload, “Exclusive: Stellar Alpina Raises $4.5M to Build Rotating Detonation Engines,” May 2026. Accessed May 2026. https://payloadspace.com/exclusive-stellar-alpina-raises-4-5m-to-build-rotating-detonation-engines/↩↩↩