Sputnik Model Rocket - Step 1

First, make a hole in the center of the styrofoam ball that is large enough for the 13mm engine tube. Do not go all the way through the ball. Allow about 1/2" of the engine tube to extend past the end of the styrofoam ball. To make the hole for my Sputnik, I used a pen that was about the same diameter as the engine. You also will need to make room next to the hole for the launch lug. One way to do this is to place the engine tube into the hole, and then slide in an 1/8" diameter dowel along the side of the tube. Move the dowel back and forth a few times until there is an area next to the hole for the engine tube that is big enough for the launch lug.

Continue to Step 2