Colossal Cannon: Building a behemoth piston-valved pneumatic by DeusXMachina

Bullet Bill Rocket by seamster

Office Supplies Challenge - Liquid Fuel Rocket by Tool Using Animal

Be an Aeronautical Scientist: Make your Own Jet Engine fo… by Kiteman

Water Rocket 2-Stage Mechanism by air.command

Iron Man Model Rocket by seamster

DIY RC Fireworks Ignition System by ASCAS

How to Make Fireworks by pudi.dk

Soda Bottle Water Rocket by cyenobite

Launch It! Contest Entry: The Alcohol Fueled Soda Bottle … by KentsOkay

Paper Stomp Rockets - Easy and Fun! by seamster

Nyan Cat Rocket by Deadendshop34

GoPro Model Rocket by seamster

Water Bottle Bazooka by jeff-o

Professional water rocket guide by oscarthompson

Mercury Joe: Semi-scale flying GI Joe Redstone Rocket by JamieClay

Handheld Rocket Launcher!! by kaptaink_cg

Fireworks Igniter by systemf92

Air Cannon v3 by trebuchet03

Easy to build, easy to use, water bottle launcher! by bpwagner

Launch It: Patriot Model Rocket by kruser495

Paper Rocket with Launcher by KelliShaver

How To Build a Generic Air Cannon by eyebot117

Fun with teabag / bar trick by datelus

How to Make a PVC Rocket Cannon by NightHawkInLight

How to Make a Liquid Nitrogen Rocket by kentchemistry.com

Party Popper Rocket Launcher by knaven

build a safer(?) fireworks launcher with an old computer. by firehazrd

Make a Vacuum-cleaner Bazooka by ynze