The Japan Aerospace Exploration Agency (JAXA) on Thursday conducted a ground combustion test of a second-stage engine for the Epsilon S small solid-fuel rocket that it is currently developing.

Hybrid rockets combine a solid fuel grain with a liquid or gaseous oxidiser, offering a compromise between the simplicity of solid motors and the throttle‐and‐restart capabilities of liquid engines.

Researchers developed a hybrid generative AI framework that designs 3D energetic material grain structures to match ...