4th and Final Launch

Mass of rocket empty: 155.16g

Mass of rocket w/ water: 644.67g

Flight time: about 9 seconds

Time to max height: 4 seconds

Estimated height: 25 ft

From the other launches we used less water, a new cone, and we used a different technique for the parachute. We hung the strings on the outside of the rocket and stuck the parachute inside the cone. This allowed the parachute a guarantee of deployment. It was very successful because it was in the air for about 9 seconds which is a huge improvement. We could have pumped a little more air into it to make it go that much further but we kept the pressure at 80. The rocket overall was a successful one, it just needs the right weather conditions and a good amount of air pumped into it (:

FOURTH & FINAL ATTEMPT VIDEO 

3rd Launch Data

Mass of rocket empty: 155.16g

Mass of rocket w/ water: 644.67g

Flight time: 7 seconds

Time to max height: 3 seconds

Estimated height: 15 ft

This launch was very successful! The parachute deployed and the rocket shot up strait into the air! We used less water, about 1/4 of the bottle so that it was easier to get air into the rocket. It did not reach 10 full seconds like we would have wanted it to but it was the best our rocket did so far in our rocket bottle project!

2nd Launch Data

Mass of rocket empty: 155.16g

Mass of rocket w/ water: 644.67g

Flight time: 4 seconds

Time to max height: 2 seconds

Estimated height: 10 ft

The second launch was successful, the rocket finally left the ground. However the parachute did not deploy so it didnt go as high and as long as we would have wanted. We think we used too much water making it harder to pump air into the rocket. So we tried again (:

1st Launch Data

Mass of rocket empty: 155.16g

Mass of rocket w/ water: 644.67g

Flight time: N/A

Time to max height: N/A

Estimated height: N/A

The launch was not successful due to a design failure. it was pointed out that since we cut two bottles in half in stead of keeping one bottle whole, it allowed air to escape out of the sides that were taped. so now we will make a whole new rocket making sure to keep one bottle whole so that no air escapes and we build enough air pressure, around 80psi to have a successful launch next class.

Construction of ROCKET (on land)

Putting the two bottles together was a challenge that we faced when constructing our rocket. It was hard getting the right cut and fitting them in together. Deciding the amount of tape we used was a big challenge because we wanted it to be sturdy but not heavy. We were also worried about the alignment of the fins, determining whether it would fly strait or not. After figuring it out we are confident that our rocket is proportional and the right weight for a successful launch of at least 10 seconds.

Materials

Two 2-liter bottles
One small plastic cone (athletic)
Duct Tape
Scissors
String
Manila Folder
Large Plastic Trash Bag
Masking Tape or Avery Paper reinforcement labels (you'll need 32/chute.)
Hole punch

http://www.lnhs.org/hayhurst/rockets/

Definitions

Pressure: the exertion of force upon a surface by an object, fluid, etc.
PSI: Pounds per Square Inch
Center of Mass: the mean location of all the mass in a system
Propulsion: the act of propelling or the state of being propelled
Newton's 1st Law: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by and unbalanced force
Newton's 2nd Law:A body of mass subject to a net force undergoes an acceleration that has the same direction as the force and a magnitude that is directly proportional to the force and inversely proportional to the mass, F = ma 
Newton's 3rd Law:The mutual forces of action and reaction between two bodies are equal, opposite and collinear


Citation: http://www.dictionary.com