Water Rocket

Water rockets have been a source of entertainment and education for many years. They are usually made with an empty plastic bottle by adding water and pressurizing it with air for launching. So come, innovate, and show us your product making skills by making an excellent water rocket!

Schedule:  10 am to 5 pm -- March 5, 2017.

                CASH PRIZE - INR 10000

First round:  “SPEED TEST”

  •   Here, the speed of the rocket is tested. The rocket has to travel a minimum of 90m.   The teams with maximum distance/time ratio will get to qualify for the next round.

  •   Points will be awarded according to the following relation:

  •   Total Points = Range (in m)/time taken (sec)

  •   This round is eliminative from which only the top teams will proceed to the next stage.

     Second round : “NO RUSH – REACH THE TARGET”

     This round tests the stability of rocket. Two chances will be provided for launching the rocket. There will be 3 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

  • 4. Otherwise : P= 0 points

Total points  =  P + 10*Time taken.

In case of tie in total points, Maximum points are scored by the team which scores maximum points by hitting the region (P).

If the points scored by hitting are also equal, then the points obtained from the first round will be considered.



  • There will be a fun round for the participants who are not able to qualify into the final round.

  • Judging criteria will be :

  1. Cool Rocket Design.

  2. Spirit of the team and coordination.

  • Team will be given specific time for this event.

  • Goodies will be given to the winners of the fun round.
    So there is no going back empty hand.

The final judgement is based on the total points scored by the participated team 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.

Water rockets can 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 60 psi.

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

  • The team will be disqualified/given another chance to remodel, if the model is found to be dangerous in any way. Decision of the organisers is final.

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

  • The rocket body should be made only with plastic bottles of aerated soft drinks of maximum capacity 2.5L and should be free of any fabrication failures or dents caused by heat exposure. More than one bottle can be used but the total volume must be less than 2.5L.

  • Working fluid is water and only it should be used in propulsion of rocket , no other things or system should be used. Participants will use the water provided by the organizers.

  • Foot pump will be provided by organizers , this foot pump is compatible with the standard bike valve. Please check the sizes of nozzle which you are using in case of using your own launcher. If you have a size which differs from the standard size, arrange it beforehand to avoid any inconvenience. It will not be provided by the organizers. In case participants use their own pump, it must have a pressure gauge.

  • 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 rule limit. 

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, max of 45 seconds under pressure loading before launching water rocket.

4. Can school students participate as well?

=> Totally. No barriers at all.

5. What will be the pre-requisites?

=> 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 in any circumstance. The team has to deal with their launch pads in case it gets damaged or broken.

7. Will any materials be provided on the spot?

=>The organization 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 in the stationary shops in the 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, if any such thing occurs. If 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 in allowed to participate in the first place?

=>The event managers’ decision is final in this regard. If any model is found dangerous to the humans or property and 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 PR desk. The on-spot registration must be done at least one hour prior to the event’s start.

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

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

13. Is modification of the model design allowed?

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

14. How many trials will be given for a team in a particular round?

=> Strictly two. No more, no less. 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 organizers will decide whether to conduct a tie breaker. The tie breakers will be simple enough that won’t require major changes in the model.

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

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

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

=>You wouldn’t get any additional trial 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 organizers 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?

=> 2 or 3 people per team. No more and no less

 Design a water rocket that is completely powered by the thrust provided by compressed air in the bottle and using water as the ‘fuel’ to increase the mass fraction.


SIDDHARTH                              -9444066520

ABHISHEK KUMAR SINGH        -9940417348

RITIK VERMA                             -9651338114


Email us at waterrocket@pragyan.org


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