1. Prepare two 1250 ml PET bottles.
  2. 2
    Cut one of the bottles into three parts. Please keep the bottles top and middle section.
  3. 3
    Stick the bottles top into the other PET bottle’s bottom part.
  4. 4
    Stick the first bottle’s middle section into the second bottle’s top part. (Please use the insulating tape.)
  5. 5
    Cut four acrylic boards as the four empennages of the rocket.
  6. 6
    Pour about 200 ml Water into the bottle.
  7. 7
    Cap the rocket into the inflater ready to launch.
  8. 8
    Put the rocket into the launch pad.
  9. 9
    Pump the air into the bottle.
  10. 10
    Make sure the atmospheric pressure in the bottle is about 70~75 percent.
  11. 11