Step 1: The materials you will need.
one Cardboard box (You will need to cut out three wings.)
At least three empty soda bottles (2 litter size)
One role of plastic drop cloth. This can be found at any local hardware store. I used 0.7 mil size (thickness). I would not go much bigger.
One tennis ball
One spool of nylon twine
Tools you will need:
one pair of good scissors
one 12' inch ruler
One spool of duct tape
One hole puncher
you may also want a drill
Step 2: Preparing your rockets engine.
Pick the best bottle for the engine. This means make sure there are no holes or cuts in the bottle. You should never have to cut the engine bottle.
Step 3: The middle of the rocket.
Use the picture as a diagram.
Save the neck of the bottle you will need it for latter!
Step 4: Making wings!
The hypotenuse side should be 6' inches, the adjacent side should be 5' inches, and the opposite side should be 3' inches.
These measurements are what I used, you could test other shapes and sizes to see what fits your rocket best.
Step 5: Time to assemble part of the rocket.
Now attach the wings by using duct tape. You can evenly space the wings by finding the circumference of the bottle and dividing it into three parts. You should attach the adjacent side to the bottle and the opposite side should be towards the bottom.
to find circumference use this formula :
You may also want to put the wings on a angle. This will make your rocket spin when it is launched. If it is spinning it means that the rocket is going straight up.
After this step your rocket should look like the picture.
Step 6: Making the nose cone.
My teacher helped the class with this part because it is dangerous.
He had to heat the bottom of the bottle so it would get a rounder shape. After he was done heating the bottle, I was able to cut the neck of the bottle off.
*Save the neck you will use it in the next step.*
Step 7: Deploying devise.
You should take the two neck pieces that you have saved and tape them together. Put the bottle openings together and tape around them to secure them. Look at the image to see what it looks like.
Step 8: Putting the rocket together. :)
You are almost done! All you need now is a good parachute.
Step 9: How to make a good Parachute!
Only use the directions on how fold and cut the plastic. Make sure you follow the directions, it is easy to make a mistake.
Step 10: Punching holes in the canopy.
First you will pick twelve spots evenly around the canopy (make sure to mark the spots with the sharpie.). You can do this by finding the circumference and dividing it by twelve. Then put an inch of duct tape (front and back) on each spot. This is where you will punch holes in the canopy with the hole puncher. The duct tape will make the holes stronger.
Step 11: Making shroud lines.
Step 12: The tennis ball.
Always remember to be safe and have fun!