Hybrid rocket engines offer perks from both worlds, with simple solid fuel and the ability to throttle down by regulating oxidizer flow. Naturally, [Integza] decided he should try and 3D print one.

Hybrid rocket engines offer perks from both worlds, with simple solid fuel and the ability to throttle down by regulating oxidizer flow. Naturally, [Integza] decided he should try and 3D print one.

China says it fired up the world’s largest single-segment solid-fuel rocket engine for the first time, at a ground testing facility in the country’s northwest on Tuesday. The rocket’s 3.5 ...