Silver97232 built this rocket launcher using standard Estes model rocket engines and custom-fabricated fins that were superglued on. Video and schematics after the jump. Here are some of the needed parts:

2″ pipe over 5′ in length to avoid getting blowback in you face. Rocket engines, ignitors, lauch controller or any device that puts out about 6v. Balsa wood and superglue

Video Demonstration

Schematics