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.

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 ...

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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 ...