How to build a rocket???

Hey its easy to build just follow the instructions i give:-)

Rocket Power

This rocket works by building up pressure in a small film canister. When the pressure reaches its highest point, the canister will pop open and send the rocket flying into the air. The gasses built up inside of it will help propel the rocket as it takes off – much like a real rocket.

Materials

You will need many materials for a proper rocket, but despite the seemingly difficult instructions, building your rocket will be very worthwhile once you see it in flight. First, you will need several sheets of computer paper to create the rocket's shape. You will also need a plastic 35-mm film canister, some packing tape (clear), scissors, Alka-Seltzer tablets, paper towels, and water. You can add other materials too if you want to make your rocket look cooler – just make sure that you keep the weight down for the best flight possible (just like a real rocket).

Shaping Your Rocket

Start by creating the shape of your rocket with the paper. Fold the paper in half the long way. Use one half of the paper as the body of your rocket and divide the other half of the paper in half the short way (you should have a half of your paper and two quarters). Use one of the quarters of your paper for the fins and the other quarter for the nose cone. Fold your fin quarter in half and then fold it diagonally. You should have created four triangles in your folds. Cut along each of the fold lines to get four fins. For the nose cone, sketch out a circle and cut around it. Then mark the center of the circle and draw two lines out from it at a right angle, much as if you are dividing the circle like a pie. Cut out a quarter of the circle.

Putting it all Together

Now take the long piece of paper you saved and tape it to the film canister so that the canister hangs down slightly from the long edge of the paper. Make sure that the cap part of the canister is easy to get to. Roll the paper around the canister to make the main body of the rocket look just like the rockets you have seen on television. Now tape the fins onto the rocket and roll the circular nose cone into a cone, taping the edges together so it looks like a cone. Tape your nose cone to the top of the rocket.

Blast Off!

You are all set to blast your rocket off. Turn the rocket over and take off the lid of the film canister. Fill the canister about a third with water. From here on you will have to work quickly for a great blastoff, so read these instructions before you actually do anything else. Drop one of the Alka-Seltzer pills into the canister and snap the lid on tight. Let the rocket stand up straight before you wait for it to take off.

Bigger and Better Rocket Ideas

That rocket was pretty cool – but what if you want a bigger blast? You can use other materials and bigger canisters to make rockets that are more powerful. Consider using a larger film canister or even a bottle with a small plug in it. There are other combinations of reactants that will work great too. Try mixing a soda-based drink like Pepsi or Coke with Mentos candy for a very big explosion that is sure to impress your friends.