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What is the best ratio of water to air in a bottle rocket?

What is the best ratio of water to air in a bottle rocket?

Conclusion. As can be seen from the graphs above the optimum amount of water can greatly vary from 10%-60% depending on your rocket and launcher configuration, however, most rockets will not fall into these extremes. For larger nozzles the optimum is closer to 33% while for smaller nozzles the optimum is closer to 25%.

How do you make a bottle rocket stay in the air longer?


  1. Use higher pressures.
  2. Keep weight to a minimum.
  3. Increase rocket volume.
  4. Streamline the body of the rocket to reduce drag.
  5. Use a launch tube on the launcher.
  6. Use the right amount of water.
  7. Use an optimum sized nozzle.
  8. Use multiple stages.

How do you make a bottle rocket with 2 2 bottles?

Push bottom half of two liter bottle upside down into top half – keeps ballast in place. Use small piece of tape to secure bottom piece inside bottle. Place the un-cut 2 liter bottle (pressure vessel) into top half. Try to make bottles straight.

What is the best fin shape for a bottle rocket?

elliptical fin shape
Theoretically, the best fin shape for a rocket is an “elliptical fin shape.”

How much PSI is in a bottle rocket?

The bottle rocket should be pumped no higher than about 50 pounds of pressure per square inch, but never above 90 psi.

Is it better to have 3 or 4 fins on a rocket?

So the question becomes — 3 or 4 fins? Three fins are best when designing a high performance, low drag rocket. This allows interference drag (drag caused by interference of the airflow over the body and fins at the junction) to be reduced by 25 percent.

What materials do you need for a bottle rocket?


  • empty two-liter soda bottle.
  • wine cork.
  • playdoh.
  • duct tape.
  • utility knife.
  • cardboard.
  • bike pump.
  • paint.

What is the best size and shape for bottle rocket fins?

The results of my experiment show that the elliptical fin design is the best fin design, with a maximum apogee of 961 feet and an average apogee of 949 feet. The rectangular fin design came in second place with a maximum apogee of 878 feet and an average apogee of 838 feet.

What size bottle is best for a bottle rocket?

The very best bottle to use is a 2-liter plastic pop bottle that previously held fizzy pop. This type of bottle is very good at holding the pressure that your rocket will need.

How do you make a nose cone for a Bottle Rocket?

Making a One Bottle Rocket with a Launcher Roll a piece of paper into a cone. Wrap the nose cone with duct tape. Attach the nose cone to the bottom of the bottle. Take thin cardboard and cut out 3-4 triangles. Add ballast to give the rocket weight. Fill up the bottle with water. Make a very small hole through a cork.

What materials are used to make Bottle Rocket?

Materials for a Homemade Bottle Rocket. We only used a handful of supplies for pop bottle rocket. You’ll need electrical tape, four pencils (or Popsicle sticks), vinegar, baking soda, paper towel and a cork.

How do bottle rockets fly on their own?

When you stomp on the bottle, the air inside is compressed. The compressed air escapes to an area of lower pressure down the pipe and into the body of the rocket. But the rocket has a closed end and the air cannot escape and pushes downwards against the pipe, too. This causes the rocket to fly off the launcher and into the air.

How do I hold a Bottle Rocket?

Hold the rocket by the neck of the bottle and pump air into it. Let go of the bottle. The water will shoot out everywhere when the bottle rocket takes off, so be prepared to get a bit wet. Do not approach the rocket once you start pumping, even if it appears that nothing is happening with the launch, as this can lead to injury.