Home grown pyrotechnics

i love building anything that can move under its own power. my main hobby has been building rocket engines ever since i saw a picture of the space shuttle when i was 12 and i thought to my self "how do you make fire go down?" and iv'e been hooked ever since. i am no mathematician or a proper physicist so i will not be able to give you any performance numbers but i can give dimensions and useful wisdom that i have obtained.