Stellar Alpina, a Zurich-based SpaceTech startup growing compact rotating detonation rocket engines (RDREs) to make motion between orbits sooner, smaller, and extra environment friendly, has secured €3.8 million (CHF 3.5 million) in a pre-Seed funding spherical.
The spherical was led by Founderful, with participation from LP&E and chosen strategic traders from the DeepTech ecosystem.
“The area economic system is transferring past the query of entry to orbit. The subsequent problem is motion after launch: transferring, repositioning, and working belongings throughout higher-energy orbits, cislunar area, and extra complicated mission architectures. We imagine detonation-based propulsion can present the step change this requires by making rocket engines smaller, extra environment friendly, and extra succesful. Stellar Alpina is constructing the inspiration for mobility within the area between worlds,” stated Victor Elliesen, co-founder, Stellar Alpina.
Stellar Alpina was based in 2026 by Rick Röthlisberger, Simi Y. Wespi, Victor Elliesen, and Patrick Egli, all of whom are alumni of ARIS, the Tutorial Spaceflight Initiative Switzerland, the place they labored on interdisciplinary rocketry initiatives and developed the world’s first student-built rotating detonation rocket engine in 2024.
For years, co-founder Simi Wespi continued advocating for RDREs in Switzerland regardless of repeated rejections. As a substitute of giving up, he assembled a crew inside ARIS and proved the idea.
The corporate develops rotating detonation rocket engines and in-space car architectures for orbital mobility, high-energy transfers, and future deep-space infrastructure.
Based on the corporate, at present, a satellite tv for pc operator that should transfer a payload from low Earth orbit to geostationary orbit relies on propulsion architectures which have modified little in a long time. Operators planning for in-space servicing, meeting, or repositioning discover few methods designed for the cadence and adaptability their missions demand.
The startup highlights a widening hole between the necessities of the area economic system and the capabilities of current in-space mobility methods. It states that 1000’s of satellites require repositioning and orbit administration. Lunar programmes from NASA’s Artemis to ESA’s exploration roadmap rely on dependable switch and touchdown capabilities. In-space servicing and manufacturing are transferring from idea to procurement. Governments and establishments are investing in resilient, manoeuvrable area architectures. The infrastructure to assist all of this doesn’t but exist at scale, the corporate mentions.
Stellar Alpina believes detonative propulsion may also help sort out this problem. Each chemical rocket engine working in area at present burns propellant by means of deflagration, a subsonic combustion course of that has outlined rocket engineering because the starting of the area age.
The corporate claims that detonation, a course of through which a flame entrance strikes at supersonic speeds, can extract much more vitality from the identical quantity of propellant
Stellar Alpina is harnessing these detonation waves. “Detonative propulsion has far-reaching implications: for a given thrust stage, these methods could be smaller and lighter, require fewer mechanical elements, and ship larger efficiency. Far past incremental engine enchancment, Stellar Alpina is advancing a paradigm shift in how rocket engines look and function. At a system stage, RDRE expertise has the potential to reshape which missions are viable and what prices operators face when transferring between orbits,” the Swiss startup defined.
Stellar Alpina constructed and commissioned its take a look at infrastructure and accomplished a full engine take a look at marketing campaign with Engine 0, its first rotating detonation rocket engine, 82 days after incorporation.
The marketing campaign included eight detonative hotfires and produced footage exhibiting as much as 5 steady detonation waves, marking the primary recognized industrial RDRE hotfire milestones in Europe. The funding will now assist Stellar Alpina flip that momentum into engines designed for the subsequent period of in-space mobility.
“Founding to hotfire in below three months. That tells you ways this crew operates. The in-space mobility market is massive, underserved, and rising quick. We imagine the founders of Stellar Alpina are the crew to construct a category-defining firm from Switzerland,” stated Alex Stöckl, founding associate, Founderful.
