#BOTTLE ROCKET WITH EGG AND PARACHUTE FULL#

Regarding center of pressure the pressure difference inside and outside the rocket is resolved at the narrow bottom of the rocket, making that the center of pressure. This explosive exit of reaction mass will cause the rocket to shoot up into the air, this is because of Newton's 3rd Law of Motion 'For every action, there is an equal and opposite reaction'. Since there is water in the way of the air escaping (the reaction mass) the air will push against the water, forcing the cork out of the bottle and expelling the entire contents of the bottle (compressed air and water) in one explosive motion.

The soda bottles were fundamental to creating the rockets. Figure 4: Aluminum balls to be put in cones. Figure 3: Cone shaped pieces placed on top of soda bottles.

#BOTTLE ROCKET WITH EGG AND PARACHUTE FULL#

The piece would then be taped to a full soda bottle that's flipped upside down. When more air is forced inside the bottle the pressure builds up, and when there's enough pressure the air will try and escape the bottle through the easiest exit - the corked opening. Figure 2: We had to cut the top part of bottles in this way. By adding water as a reaction mass (like the ballast we used in the Stomp Rocket Lesson) we're reducing the air space inside the bottle. When we use the bike pump we're forcing more air inside the bottle, creating pressure. This rocket works on pressure, specifically the pressure difference between what's inside the bottle (water and pressurized air) and the air outside the bottle (the atmosphere).

With the fins cut out, I taped them onto the bottle at the height that would have them hold the bottle opening up off the ground. a computer with examples of water-bottle rockets from the web. (i cut stuff off a roll from the art guys.) -Metersticks (yardsticks for the people south of me ) :-) -Lots of pencils. Your rocket can have as many fins as you like, but I recommend 3-4 fins (a good compromise between weight and stability). Tools and Materials: -a couple of 2 liter bottles. Then, repeated the same process for a few more fins. Once I was happy with the sizing and shape, I first cut the rocket fin out using a sharp hobby knife. I wanted these rocket fins to be large and rigid enough to hold the rocket up off the ground, allowing enough room for the bike pump valve while keeping the rocket perpendicular to the launch pad (the ground). Rocket fins can be made of almost any rigid material and take almost any shape you like I made these fins out of an old cardboard box. The fins are lined up parallel to the body of the rocket so that when the rocket is in flight the fins will direct air, keeping the rocket pointing in the right direction during flight. Fins on a rocket help keep it steady in flight.

Bottle rocket with egg and parachute