Looking for something exciting to do? Try building a water powered rocket out of a 2 liter soda bottle. This can be completed in less than half an hour with simple household materials.
1 Two liter bottle
Card stock although construction paper will work
1 Schrader needle
Step 1: The Cone
To form the cone simply fold over the corner of a sheet of card stock or construction paper and continue rolling until you get a cone with a base that is the diameter of the bottom of the soda bottle.
Tape the base of the cone to the rocket using as little tape as possible and a strip of tape running up from the base of the cone to the tip where the paper ends.
Step 2: The Fins
To make the fins take a piece of cardboard and cut out 4 equal fins. The fins should be about 2 inches wide at the base and 8 inches high. I only ended up using 3 fins and kept the 4th as a spare.
Attach the fins with about an inch long strip of tape on each side at the top of the fins to the point just above where the bottle starts to curve inwards. Seen picture 3 below. One way to help space the fins out equally is to take a piece of paper and wrap it around the circumference of the bottle then take it off and fold it into thirds, marking each third. Then put it back around the bottle and mark each point.
Step 3: The Cork Stopper
Take a cork and stick it into the soda bottle's opening to make sure that it fits in snugly. Then cut it down to appropriate height so that the Schrader needle is longer than the cork as seen in the below photo.
Step 4: Filling With Water
I suggest filling about 10% with water, although, you can experiment and find what you think works best.