Ok, so if there is a better place for this, please do move it mods, I just couldnt find a place to post project related stuff so I chose this part of the site. Anyways, I'm working on a homemade liquid rocket engine all based around a CO2 cartridge combustion chamber. This project also has the possibility to be a hybrid. Anyways, assuming I keep it a liquid engine, I have to ideas for the injection setup. Either just two copper tubes (one for oxidizer and one for fuel) going in at the top, or one tube going in at the middle of the top and some sort of simple manifold that goes around the top and has a few holes drilled into the chamber. I wish I could describe it better, but I can't and I dont have any good schematic drawing program. This is just a fun project for me (ha ha, I'm a geek, I know it) and is not intended to be very precise or powerful. Thanks everyone and happy holidays.