Liquid Fuel Rocket made from office supplies. Warning, this is kinda dangerous, I had one blow up in my hand already, it was more startling than anything, the two halves flew off in different directions, (wear leather gloves just to be safe.). But they'll fly about 75 feet straight up.
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.