Franco-German Institute of Saint-Louis Fires Its Electromagnetic Railgun in Open Field for the First Time
Key points
- The French-German Research Institute of Saint-Louis (ISL) conducted the first open-range, free-flight shot of its electromagnetic railgun on 29 June 2026 at its Baldersheim proving ground
- The launcher fired 25-millimetre projectiles above Mach 5 under accelerations beyond 100,000 g, per Opex360 — figures ISL's own release withheld
- The work feeds two European Defence Fund efforts: PILUM, the ISL-coordinated electromagnetic-artillery research project, and its successor THEMA, led by KNDS toward a roughly 30-kilometre land demonstrator around 2028
- ISL's French director Christian de Villemagne said the technology has "left the laboratory" — even as the FCAS combat-air programme it sits alongside fractures publicly
The binational Research Institute of Saint-Louis fired its electromagnetic railgun in the open air for the first time on 29 June 2026 at Baldersheim, sending 25-millimetre projectiles beyond Mach 5 and moving a decades-long research effort out of the laboratory.
The Institut franco-allemand de recherches de Saint-Louis — ISL, jointly funded and directed by France and Germany since 1958 — announced the milestone as the first free-flight firing of its electromagnetic launcher outside a closed test cell, at its dedicated railgun range in Baldersheim, Alsace. The institute's own statement withheld the performance figures; the near-primary account from Opex360 gives them as 25-millimetre projectiles accelerated beyond Mach 5 under loads exceeding 100,000 g.
The shot matters as a maturation step rather than a weapon. A railgun uses electromagnetic force, not chemical propellant, to drive a projectile — promising very high velocities, deep magazines and no explosive charge to store, at the cost of enormous pulsed-power demands and severe barrel wear that have kept the technology in laboratories for decades. Firing in free flight, rather than into an instrumented catch, is the point where the science begins to resemble an application.
The institute's work channels into two European Defence Fund projects, and one national one, that are easily conflated. ISL coordinated PILUM, the EU research effort toward hypervelocity artillery projectiles reaching several hundred kilometres; its successor THEMA, led by KNDS, is maturing critical components toward a land demonstrator of around 30 kilometres by roughly 2028. Separately, ISL's research underpins a French DGA and Marine nationale ambition for a naval gun reaching some 200 kilometres — a longer-term goal distinct from the THEMA land system.
The proprietary read. The timing is the quiet counterpoint to a loud month. While the Franco-German defence relationship visibly fractures over the FCAS fighter — Dassault dismissing its partners in public — the two governments' oldest joint research institute keeps producing, on the decades horizon where its director says the railgun has now "left the laboratory." As noted in Großwald Signal No. 101, the binational plumbing of European defence outlasts the headline quarrels above it: a railgun is not a 2026 capability, but it is a bet France and Germany are still placing together.
