Here is a video of how we made our parachute system/nosecone:
if this video doesn't work, click here.
How to set it up for a launch:
1. Turn on the Flight Computer to reset the servo.
2. Pack the parachute nice an tight and close the door.
3. Stretch the elastic band around the bottle twice and hook it over the servo arm.
4. Arm the Flight Computer.
I hope this can give you some ideas when make your new rockets and please comment if you have any questions!