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Water Rocket


Water Rocket, a simple entertaining event that requires both interest and skills in fabrication, whereby one has to build plastic soft drink bottle that thrust water as a result of pressurized air to propel the rocket upwards.

Prizes worth INR 12000

Date: 3rd March 2018

Time: 10AM to 5PM

Venue: NSO



The event will consist of 2 rounds.


  • The range of the rocket is tested and it has to travel a minimum of 90m.

  • This round is eliminative whereby, only the top teams will proceed to the next stage.

  • Points to be awarded according to the following relation:

      “ Total points = range (in metres)/5”    


  • This round tests the stability of rocket.

  • Two chances will be provided for launching the rocket.

  • There will be three circular regions in the arena, having  P  points  for hitting,

1. Region A  (5 meter radius region): P=50 points

2. Region B  (7 meter radius region): P=25 points

3. Region C (10 meter radius region): P=15 points

 Otherwise  = No points

  • Total points = P+ (10 x Time taken)



  • The final judgement will be based on the total points scored by the participating teams in both the two rounds described above.
  • The total points scored in both the rounds are added up and awarded as their final score.
  • Decision of the organisers is final.


1.Can we change the volume/capacity of the bottle? 

=> No. The capacity of the bottle is fixed in all rounds as per the limits of the rule

2. What is the range of the target in the second round? 

=> Around 70 Metres. 

3. Is there a time limit for pressure pump-launch for every water rocket attempt? 

=> Yes. A maximum of 45 seconds under pressure loading before launching water rocket.

4. Can school students participate as well?

=> Yes. There are no restrictions whatsoever

5. Are there any prerequisites?

=> Building a water rocket is both fun and is quite an easy task. Basic designing and fundamentals in aero modelling would be sufficient.

6. Will launch pads be provided?

=> Not under any circumstance. The team has to deal with their launch pads in case it gets damaged or broken. Sharing of launch pads among teams is strictly prohibited even if they are from the same college failing which the team(s) will disqualified.

7. Will any materials be provided on the spot?

=>The organisation only provides water, a measuring cup, a bucket and compressors (which will have an in-built pressure gauge). Other materials will NOT be provided. However, you can buy items from the stationary shops in campus.

8. What if the rocket gets destroyed?

=>The team is expected to deal with the damages and repairs of both their rockets and launch pads. In case of such an event, and the team is unable to get them fixed, they will automatically be disqualified. Any destruction of the college property or the models of other teams will lead to direct disqualification.

9. Are we allowed to have mechanisms in our models?

=>Yes, as long as they do not involve any electronic circuits and chemical explosives. Moreover, any sling-shot or catapult mechanisms in the launch pad will NOT be allowed. Allowed mechanisms are parachute, gliding, multi-stage rocketing, zip tie, etc.

10. Who decides if the team is allowed to participate in the first round ?

=>The event managers’ decision is final in this regard. If any model is found dangerous to humans and property or if any of the above prohibited mechanisms are used, the team will be disqualified.

11. Is pre-registration necessary?

=>It is highly recommended that you pre-register for the event. But you can also register on-spot at the Registration desk. The on-spot registration must be done at least one hour prior to the start of the event.

12. Should the model be made even before we come to the college?

=>Not necessarily. You can bring the materials and construct your model inside the campus, but it should be completely ready and functional before the event begins. If the organisers find the model to be readymade, the team will be disqualified. The organisers’ decision is final.

13. Is modification of the model design allowed?

=>Modification of models within a particular round is prohibited. However, different models can be used in different rounds.

14. How many attempts will be allowed for a team in a particular round?

=> Strictly two. We will either consider the best or the average. The final judging criteria will be intimated before the event begins.

15. What if there is a tie between some teams?

=>The organisers will decide whether to conduct a tie breaker. The tie breakers will be simple such that it won’t require major changes in the model.

16. How much time will be given for one launch?

=>Maximum of 15 minutes. No additional time will be given.

17. Will I get an additional trial if the rocket fails to launch, i.e. Rocket doesn’t even leave the launch pad ?

=>You won’t get any additional trials unless you have one trial left out of the two allowed trials.

18. What will happen if I reach late for the competition?

=> Punctuality is highly appreciated. But in any case of unavoidable delay, inform the organisers before, so that they would be able to allocate a time slot for you. But if you appear late without informing, you’ll be disqualified.

19. Can we team up with students of other colleges?

=> Yes, it is allowed. The members could be from different colleges, different branches, different years or even pursuing different degrees (UG and PG). 

20. How many participants per team is allowed?

=> A maximum of 3 people per team is allowed.


  •  Water rockets have multiple stages. Parachute, gliding and other mechanical launch mechanisms are allowed. Booster mechanisms are allowed as well.
  •  Use of electronic components and chemical explosives are banned.

  •  Maximum pressure supported is 50psi .

  •  Participants are advised to make different models for different rounds, in case of any damage to one, but the water rockets must be identical.

  • The Teams will be disqualified/given another chance to remodel if the model is found to be dangerous in any way.

  • Participants are supposed to get their own launching pads which cannot be shared by other teams.

  • The rocket body should be made only with plastic bottles of aerated soft drinks of max. capacity 2.5L and should be free of any fabrication failures.

  • More than one bottle can be used but the total volume must be less than 2.5L.

  • Working fluid must be water and it should be used only in propulsion of rocket, no other things should be used.

  • Participants will use the water provided by the organisers.

  • Foot pump will be provided by organizers, this pump is compatible with standard bike valve.

  • Check and correct the valve sizes beforehand to avoid any inconvenience.

  • Participants must use only the Pump which will be provided by Organizers .

  • Decisions made by the organisers is final and binding.


Sarfaraz - 9094736910

Harsha  - 978 980 4673

Or email us at waterrocket@pragyan.org

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