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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

water rocket basics

Members post instructions to construct water rockets, launchers, deployment systems, staging mechanisms, splicing bottles, and payloads.
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water rocket basics

Post by boompow » Mon Nov 07, 2011 10:10 pm

Help me please! My physics class has been designing water rockets. It's been really fun. We have to launch and safely return and egg back to the ground as part of the project. I'm redesigning my rocket tonight, because I have learned some things to make it work better, but I still have lots of questions, and we don't have very much time left in class!
1. In my rocket, we extended the rocket so it was long-27 inches. It went pretty high, but is it better to be shorter and lighter?
2. My rocket had a large parachute too- it was 33 inches in diameter. The egg was attached to the parachute. I put it inside of my rocket, thinking that it would come out when it reached it's maximum height. The large size of the parachute might have caused it not to deploy. My rocket was sent speeding to the ground and the egg broke.
3. Do you think it's better to have the parachute attached to the rocket? Or have it come out of the rocket, with the egg attached?
Thank you!!

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Re: water rocket basics

Post by Brian » Tue Nov 08, 2011 12:06 am

The length doesn't play a big role in performance.
More weight will allow it to coast further, as most water rockets are under weight.
For a fall off nose cone recovery the nose cone I think should be 2 times heavier than the rocket. Common problems occur when the nose cone gets jammed on the rocket.
Your parachute can be smaller.
It would be good to have a padded compartment for the egg in the rocket and recover it as a whole, in case the parachute fails to deploy the egg can still survive.
What size is your nozzle?

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