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.

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To do so, he looked towards rocket power, and started a new build. The design consists of ... power is solely from hobby rocket motors, providing thrust for 1.6 seconds, meaning flight times ...

Participants aim to build rockets that will reach their maximum ... can launch Class 3 rockets—which have high-propulsion motors—to such high altitudes. Since 1991, hobbyists, scientists ...