there’s more than enough info on his site to try and recreate some of his experiments, but perhaps you should start here instead: How to Design, Build and Test Small Liquid-Fuel Rocket Engines.

Hybrid rocket engines offer perks from both worlds ... Naturally, [Integza] decided he should try and 3D print one. The build came about somewhat by accident, as the 3D printed casing of one ...

A team of students from the US have smashed several world records with their DIY rocket ... Christmas tree or dinosaur balloon After the rocket's engine burned out, the craft continued its ...