Letara secures ¥2.6bn ($16mn) for non-explosive hybrid rocket engines

A Japanese space startup has secured approximately ¥2.6bn, or $16mn, to advance a novel rocket propulsion system that runs on plastic and avoids explosive classification. Letara, a company that originated from Hokkaido University, is developing hybrid rocket engines that combine solid fuel with a liquid or gaseous oxidizer. This design allows the vehicle to be transported and handled without the stringent regulations that apply to traditional solid rocket motors.

The funding round positions Letara within a growing niche of propulsion companies exploring safer, more cost-effective alternatives to conventional chemical rockets. Germany’s HyImpulse successfully raised €45mn for a similar technological approach in October of last year, signaling increasing investor confidence in this specific engineering path.

By using plastic as the primary fuel source, the engines offer a dual benefit: they address waste material reuse while simplifying launch logistics. Because the fuel and oxidizer are stored separately and only mix during combustion, the engine is not considered an explosive device under current legal frameworks. This classification significantly reduces insurance costs, storage requirements, and transport restrictions, which are often major hurdles for smaller launch providers.

Letara’s progress comes at a time when the global demand for small satellite deployment is surging. The company aims to provide a responsive and flexible launch service that can cater to this market segment. The fresh capital will likely accelerate the development of their engine technology and support the scaling of production capabilities. The team is focused on demonstrating the reliability and performance of their system through a series of upcoming test flights.