WARNING: This video was produced by them who you call experts and was supervised by professional firefighters, not just some yahoos with a garden spray bottle.
Joerg Sprave's Slingshot Channel is one of my favorite YouTube channels, being filled with things that I shouldn't make or don't have the talent/tools to make. This one particularly appeals to the pre-teen inside of me who still resides in the desert and not within the now dreaded 30 mile circle around our Nation's Capitol.
At 30 seconds in, you will see what appears to be a phenolic-cased black powder motor. Or maybe not. Either way, this is a cool single use rocket. Such a rocket isn't legal where I live and may not be anywhere in the USofA unless you have the proper licenses from Uncle Sam and the local AHJ.