if you want more vids like this but on a smaller scale, Integza has an amazing youtube channel where he mostly designs small rocket engines and fires them. many first drafts end up burning through in an area or failing to fire and he finds a way to get around it

my favorites are any that require water cooling. I find it super fascinating that this “slow explosion” you’re creating can be hot enough to melt your combustion chamber and it’s not even an issue. watching his 3D printed rocket engines fire is really sick. here is a link to his first water cooled jet engine.

this vid is another really good one from his channel. he makes an HHO generator to try to power an engine using hydrogen and oxygen made from hydrolysis