Artillery officer Jean-Jacques Barré starts hands-on rocket research privately with Esnault-Pelterie. Their work explored liquid propellants (liquid fuels and oxidizers), which were more complex than solid rockets but offered higher performance. This partnership became the most direct bridge between French astronautics advocacy and engine test work.
French engineer Robert Esnault-Pelterie (often called REP) delivers a widely cited talk on exploring the very high atmosphere by rockets and the possibility of interplanetary travel. This helped move French “astronautics” from a niche idea into a topic discussed in established scientific societies. It set an intellectual foundation that later connected to practical military-funded rocketry.
At a Paris dinner, Esnault-Pelterie and financier André-Louis Hirsch organize support for research on space travel and related sciences. The gathering is closely linked to early use of the term “astronautics” in France and leads to plans for a formal prize to encourage research. This created an early institutional “home” for astronautics alongside engineering work.
The Société astronomique de France awards the first REP-Hirsch astronautics prize, recognizing major work in the new field. The prize shows that French scientific institutions were tracking international rocket and spaceflight advances, even before France had steady government rocket programs. It helped keep astronautics visible during years of limited funding.
Esnault-Pelterie and Barré persuade the French War Department to fund a study of ballistic bombardment by rockets. This was an early step toward treating rockets as a national security technology, not only a scientific curiosity. Even so, France still struggled to build sustained support for major development.
Barré is assigned to Esnault-Pelterie’s laboratories, and the team tests several propulsion combinations, including liquid oxygen with gasoline. These experiments aimed to find practical propellant pairs and workable engine designs. The work demonstrated technical ambition, but also exposed safety risks and engineering hurdles.
An explosion during an experiment injures Esnault-Pelterie severely, costing him four fingers. The accident highlights how hazardous early liquid-propellant testing could be, especially with experimental fuels. Setbacks like this contributed to the stop-and-start pattern of French interwar rocketry.
France creates a central armaments organization—the Direction des fabrications d’armement (later DEFA)—to manage research and production of Army weapons. While not a “rocket agency,” this kind of structure mattered because rocket work, when funded, usually had to pass through Army procurement and research channels. It laid groundwork for later postwar missile-and-rocket institutions.
After years of mostly private experimentation, Barré continues rocket work under a contract from the Ministry of War. This marks a shift from personal initiative to formal government sponsorship, even if resources stayed limited. It also tied French rocket experimentation more closely to military needs as European tensions rose.
As World War II begins, Barré’s work is oriented toward an unguided anti-aircraft rocket projectile (“obus-fusée”). This reflects how early French rocket efforts were driven mainly by immediate wartime military applications rather than long-term spaceflight goals. The changing mission also influenced propellant and engine choices.
In Vichy-controlled France, Barré resumes and reshapes his work into the EA-41 (Engin Autopropulsé 1941), using liquid oxygen and petroleum spirit (a light fuel similar to gasoline). The program is concealed by describing the devices as “gas generators,” reflecting the risks of working under occupation. EA-41 is widely described as France’s first domestically built liquid-propellant rocket.
EA-41 engine tests are conducted in secrecy at military sites, including early trials at the Larzac camp. These bench tests were meant to prove that the engine could run stably and produce enough thrust before flight attempts. They also show the program’s constraints: limited facilities, secrecy, and frequent failures.
By late 1942, EA-41 testing cannot continue as planned, and work is forced underground as the conflict intensifies. This pause illustrates a core challenge for French early rocketry: technical learning was repeatedly interrupted by political and military events. The program’s momentum and resources were difficult to sustain until liberation.
After the Liberation of France, the EA-41 finally makes a first known flight attempt at the Renardière test site near Toulon. The rocket explodes shortly after liftoff, but the attempt is still significant as an early milestone for French liquid-propellant rocketry. Soon after, additional attempts follow, gradually improving performance.
A later 1945 attempt reaches a much longer flight, reported as about 60 km on one of the trials. While EA-41 did not become an operational weapon, these tests provided practical experience in liquid oxygen handling, pressurization, and engine behavior. That experience fed directly into postwar French missile and sounding-rocket work led by Barré.
French Early Rocket Experiments (1920–1945)