The Engine

Banger.

Cryogenic. Re-ignitable. Reusable. The rocket engine powering Envol.

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December 2025 Test Campaign

Validated through fire.

Successful hot-fire tests

Failures

7 min

Cumulative burn time

DGA EM

Test facility, France

Conducted at the DGA Missile Test Center with the support of CNES. Zero failures over the full campaign.

The 3D-printed metal Banger combustion chamber, off the test stand

The Engine

Banger. Cryogenic, re-ignitable, 3D printed.

LOX and propane. Cryogenic by design, the propellant temperatures alone are non-trivial engineering territory. Re-ignitable in flight to enable multiple boost phases on a single mission.

The combustion chamber is 3D printed in metal. Additive manufacturing gives us complex internal geometries that conventional machining can't reach, while shortening every iteration cycle from months to weeks.

Banger's development was supported by the French Space Agency (CNES), both financially and technically.

Infrastructure

Our test bench. Built by us, for us.

Most early-stage propulsion teams rent test facilities. We built our own, instrumented, modular, and reconfigurable. Every test cycle teaches us something. We don't wait for a slot. We don't share data with operators we don't control.

The bench has supported 21 successful hot-fires and counting.

Two in-house AndroMach igniters firing on the test stand against the AndroMach backdrop

Ignition

Igniters. Designed in-house.

The igniter sets the timing of combustion. It has to align the propellants to within a few milliseconds, get that right and the engine lights clean, every time.

Every igniter that fires inside Banger is designed, built, and tested in-house. Each one is reusable and re-ignitable many times over, full control over reliability and iteration speed.

Test Campaign

December 2025. DGA Missile Test Center.

Twenty-one hot-fire tests. Seven minutes of cumulative burn time. Zero failures. The full validation campaign of Banger, conducted at the DGA Essais Missiles facility in Saint-Médard-en-Jalles.

Test campaign at DGA Essais Missiles, with technical support from CNES. · Watch on YouTube ↗

The Campaign

From the lab to the test stand.

Selected images from the December 2025 campaign at DGA Essais Missiles.

Banger firing on the test stand — Hot-fire on the test stand.

Banger exhaust plume with shock diamonds — Plume and shock diamonds at full thrust.

Engineers assembling the engine in PPE — Engine assembly before a test.

AndroMach team in the test control room — The control room during a firing.

Cryogenic propellant handling at the test site — Cryogenic propellant handling.

The DGA test site at golden hour — The DGA Essais Missiles site at dusk.

Built in-house. Fired at DGA. Ready for flight.

Banger is now being integrated into Envol XP1.

Talk to the team → See Envol →