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What is the best design for a bottle rocket parachute? I want it in the air the longest.

 I am building a bottle rocket for school and need to keep it in the air the longest. I only have one trash bag 10 feet of string 5 ft of tape one construction board and two 2 liter bottles. 

bhannan14 years ago
You have to first take the trashbag and cut it along one side then cut one square out and attach string use the rest to make an oval and attach string attach the string to the bottom of one bottle cut a wawy place in the other 2 liter and take the cap and attach the square last fold up the oval and put together