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Step 1: You Will Need
Electrical Tape (Substitute Packing Tape)
Ball Point Pen
Robot Sticker (optional)
Step 2: The Rocket Body
Disassemble the sharpie and remove the ink and the point.
Cut a piece of ink tube 3/4" long from a ballpoint pen and wrap one half with a small piece of electrical tape.
Insert the tube into the sharpie where the point used to be, tap it until firmly seated.
Reassemble the two halves of the sharpie.
Step 3: Guidance
The fins are made by folding tape over on it self and attaching the tag ends to the rocket body, trim into a rocketish profile. Attach three equally spaced around the body.
Step 4: Propulsion
Take the canned air, bend the straw down next to the body, space it out with the bottle cap and secure with a rubberband.
Step 5: Launch
Outside, invert the can of canned air, slip the rocket body onto the straw. Hold the rocket body and depress the trigger on the can, allow a short time to pass and release the rocket. Wash Rinse Repeat.