How to build a transparent hybrid rocket engine using acrylic rod and a canister of oxygen, with a breakdown of how various other types of rocket engines work along the way. Consider supporting my ...

V8 Engine Model In this video, discover how to construct a fully operational V8 engine model featuring an accelerator pedal, ...

So they used wax. You can see a video about the process, including a build of a model rocket engine, in the video below. The issue is the creation of tiny cooling channels in the combustion chamber.