The Hybrid
Rocket Engine Project:

Disclaimer: Experimental rocketry is a dangerous activity.
This website details the first attempt at the experimental development
of a hybrid system that may or may not function. The information
on this site is just that, it is not intended to be a manual for
experimental rocketry and should not be used as such. Again, this
can be a dangerous activity so use any information on this site
at your own risk. If you are looking to build things that blow
up or to be used in a malicious manner, you are at the wrong site.
The site administrators are not responsible for any accidents
or injury that may occur from the building, launching, or recovery
of this system or any similar systems. Always put safety first,
work with patience, and don't make impulsive decisions. Experimental
rocketry is dangerous and should not be taken lightly.