Japanese startup Letara expands hybrid rocket ambitions with $16M funding

Letara, a startup based in Sapporo, has just closed a funding round worth ¥2.6 billion—roughly $16 million—and with it comes a significant shift in ambition. For years, the company focused on building hybrid thrusters for small satellites, the kind of incremental work that keeps a young aerospace firm alive. Now it wants to build rockets. Big ones. The kind that governments and defense ministries buy.

The timing reflects a broader momentum in Japan. The country is channeling billions into its space industry and loosening restrictions on defense exports, a deliberate effort to nurture homegrown aerospace companies that can compete globally. Letara's co-CEO Shota Hirai sees the opening clearly. "With this round, we will go beyond demonstrating that thruster in space," he said. "We plan to explore a much wider set of use cases across both the space domain and the defense and security domain."

At the core of Letara's pitch is a technical claim: that hybrid rockets—which keep solid fuel separate from liquid oxidizer—can be made cheaper and more reliable than existing designs. The company uses plastic and rubber as solid fuel, materials that are abundant and inexpensive. A proprietary manufacturing process mixes, shapes, and compresses these materials to ensure consistent ignition and burn. The result, in theory, is more thrust with less waste than traditional hybrid systems that rely on costly paraffin wax. The three problems Hirai wants to solve are thrust generation, performance consistency, and combustion control—the fundamental challenges that have kept hybrid propulsion from becoming mainstream.

The market opportunity is real. Analysts project the global hybrid rocket propulsion market will grow from $848 million in 2024 to $2.6 billion by 2032, a compound annual growth rate of 15 percent. That kind of expansion attracts attention. Letara is not alone in the race. Japan's Interstellar Technologies, China's Galactic Energy, South Korea's InnoSpace, and Singapore's Equatorial Space are all developing hybrid systems. Germany's HyImpulse and Australia's Gilmour Space are in the mix too, along with various U.S. competitors pursuing alternative propulsion designs.

Letara's roots run through academia. Co-CEOs Landon Thomas Kamps and Hirai met while researching rocket propulsion at Hokkaido University. They believed hybrid rockets offered a safety and simplicity advantage that could appeal beyond traditional government space programs, especially as private companies began expanding into orbit. When the company spun out of the university in 2020, it was a satellite thruster business. The market has since become crowded and more lucrative. Now Letara is chasing defense contracts and launch services, positioning itself to compete with international players, not just other Japanese startups.

The company is targeting satellite makers, launch operators, and governments. It sees commercial satellites as its largest near-term market for in-space propulsion—spacecraft that need to move from low Earth orbit to geostationary orbit must cross the Van Allen radiation belt, and that requires sustained, reliable thrust. Government demand for rocket systems is growing too, particularly in Japan. Letara says it has already won orders from rocket and satellite companies as well as the Japanese government, though it declined to disclose contract values.

The funding round was co-led by Headline Asia, JIC Venture Growth Investment, and Incubate Fund, with participation from NES Corporation, an energy company; Toyoda Gosei, a Toyota Group supplier of automotive rubber and plastics; and Frontier Innovations, a Greece-based data analytics firm. The investor mix suggests confidence that hybrid propulsion will find applications across multiple industries.

What comes next will test whether the technology can move from lab to production. Letara's immediate priority is an in-orbit firing test with an overseas partner—a crucial milestone toward commercialization. The company also needs to establish a repeatable manufacturing process backed by rigorous quality controls, and secure a reliable supply chain for fuel and tanks that can support scaling. When asked about using recycled plastic as fuel, Letara said it was "very much a possibility," though more development and testing would be required. For now, the company has the capital and the market tailwind. What it needs is proof that the rockets work.