https://www.instructables.com/PLA02-a-Hybrid-Rocket-Engine/
PLA02 a Hybrid Rocket Engine. : 12 Steps (with Pictures) - Instructables
PLA02 a Hybrid Rocket Engine.: !!-Disclaimer-!! This project is dangerous and possibly illegal where you live. I do not take any accountability/responsibility...
hybrid rocket enginewith picturesstepsinstructables