Step 1: Gather Materials
Two (2) Two liter bottle of soda (empty)
One (1) Three liter bottle of soda(empty)
One (1) package of string
One (1) Roll of blue painters tape
One (1) cardboard box
One (1) painter's drop cloth
One (1) pair of scissors
One (1) tennis ball
Step 2: Create a Parachute Holder
Step 3: Create a Nose Cone
Step 4: Create Fins
Step 5: PARACHUTE.
Step 6: Attaching the Wings
Step 7: Pack Up the 'Chute
Step 8: Assembly
Step 9: The Physics.
Nose Design: The basis behind the idea was to reduce friction between the nose cone and the rest of the rocket so that the parachute would be easier to deploy. We also rounded out the top of the nose cone using tape in order to make the top of the bottle rocket more aerodynamic.
Fin Design: We made parallelograms becase Apogee Rockets recomended it. We read this article: http://www.apogeerockets.com/technical_publication_16.asp which suggested that rectangles and parallelograms make fins with the least amount of drag.
RETURN DESIGN: Inertia would cause the heavier nose cone to fall off when the rocket reached its maximum height. The parachute would be stuffed in the nose cone, attached to the tennis ball. The weight of the ball would then pull the parachute out of the nose cone, and the air hitting it from below will force it open and the ball will slowly fall to the ground.