FIRST Take any kinds of rockets, and remove the core (The explosive bit). In this case, i used 6 of them. Then, roll out about 20cm of duct tape, and put them all on there with about 1cm space between each. Fill that up with the black powder from the rocket (The powder it uses to launch itself up) and stick a fuse down there. Then roll the duct tape together, and make a bottom to it, to make sure the black powder doesent fall out. It should look like above. (I used some burning firecrackers instead, but they work the same way.) Then, tighten it all up, and make the fuse longer. You can use the fuses from your rockets and just connect them with duct tape. It should look like this: This picture was taken before i lengthened with fuses. The result? http://www.youtube.com/watch?v=EA7xsb8007E&fmt=18