Water Rocket

By:Tyler Wood

1.)Define the problem-I had to come up with a rocket design that will have more air time than anyone else's


3.)Notes: History of Rocketry

Rockets were created for scientific, entertainment,food,or protection

Early rockets

First form of rocket came from the Greeks, developed by archytas as a steam powered wood end pigeon that would ‘’fly’’. Different cultures had different theories that worked, some worked better than others which helped develop our rockets today. 1,000 years ago Chinese transitioned to gunpowder instead of steam, then after that it went to fuel.

Early 20th Century

Rockets made their way into science fiction with the idea of rocket propelled space travel. rockets were really being used in World War I to take down enemy observation balloons.One very well-noted rocket was the German V-2 rocket which became the first long-range ballistic missile to see combat use. After World War II

"Operation Paperclip"; an initiative which cleared the way for German rocket specialists to come to the United States and help progress American rocketry.The German rocket specialists reconstructed V-2 rockets that the United States collected in Europe. After years of testing and modifying old V-2 rockets the German rocket specialists started designing new rockets. The new rockets are designed with the idea of traveling into space.

Lift - On a rocket, Lift is a side force used to stabilize and control the direction of flight. This is quite different from the concept of lift as it relates to an airplane. Thrust - This is the force that produces lift-off, or upward movement of a rocket. Weight - A combination of factors affect the weight of a rocket and can include cargo, passengers, fuel, parts of the rocket, materials, and other items. The longitudinal (roll) axis runs lengthwise down the rocket.

The lateral (pitch) axis runs side-to-side. The vertical (yaw) axis runs top-to-bottom. On a rocket, yaw is very similar to pitch except that the nose moves side-to-side.

Weight is one of the three forces on a rocket

mass = density x volume

The force of drag acts through the Center of Pressure

Calculating Drag

Now let us work through an example problem calculating the drag on a bottle rocket.

For our example, assume we have a 2 liter bottle with:

  1. a radius of 0.0494 m
  2. a transition cone with an interior angle of 60°
  3. a velocity of 150 m/s

The center of gravity is the "balance point" of the rocket

The center of pressure is the point through which the drag force acts and any wind forces

This means that center of pressure is the point where a force acts to cause a rotation around the center of gravity.

  • The first is a lawn dart, The rocket reaches its maximum altitude, then rotates and falls nose first back to earth
  • The second passive recovery is tumbling. The rocket reaches a maximum altitude, and then proceeds to tumble, spinning and rotating back to earth.
  • The third is backsliding. The rocket reaches maximum altitude, and then falls tail, rear, or nozzle end first back to the earth.

Active recovery systems tend to be better for heavier rockets, and provide a safer recovery. However, active recovery systems are often more complex, have a higher chance of failure, and add weight to the rocket.

4.)Certain weight,height,length and water pressure, gotta have Bottle,fins,water,and parachute

5.)Have a Dr. Pepper bottle with as less fins as possible and weigh as light as possible. Have as much pressure in the bottle as possible, Have longer lasting fins for better quality. I've learned that not to have a big heavy rocket with a short nose, or a big long nose with a small bottle, (it will not fly). Don't have too much water pressure that it beats your opponent on the takeoff because that means you will be the first to hit the ground. Also have to have the right lift for the right direction. Don't have the nose too heavy that it won't come back down straight or upside down and don't have it too light so it don’t come down the wrong way

6.)Enter the constraints of the project in the first column.

b. Score each sketch for each constraint. + = 3 pts., ==2 pts., - = 1 pt. c. Total the columns and circle the highest score.


Sketch 1

Sketch 2

Sketch 3

Weight, fins, and parachute

Parachute, water weight/pressure

Everything/ doesn’t work





















1st Test.)Parachute didn't deploy which caused it to plunge to the ground and blow up

Things I would redesign: I would definitely make my nose of the rocket more wider and put more clay on the ping pong ball so the parachute would deploy.

Redesigning the Rocket:I would definitely make my nose of the rocket more wider and put more clay on the ping pong ball so the parachute would deploy

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