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