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.

In fact, on July 24th, the HEXA rocket was officially certified as Open Hardware by the Open Source Hardware Association (OSHWA) — a first for a DIY rocket, as far as we can tell.

A rocket stove offers a practical way to concentrate fire’s heat in one direction and reduce fuel consumption. Whether you need to purify water, cook food, or simply stay warm, this build is one ...