Water Rocket

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

Date: 16th March 2019 (Day 2)
Time: 09:00 AM
Venue: NSO ground

Prizes worth INR 15000

The event will consist of 2 rounds.

Round 1: Range Test

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

  • The projection angle of the water rocket will be 45 degrees.

  • This round is eliminative.

  • Points to be awarded according to the following relation:

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

Round 2: No Rush - Reach the Target

  • This round tests the stability of the 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)


  • Maximum of 3 participants, not necessarily from the same college.

  • Water rockets have multiple stages. Parachute, gliding and other mechanical launch mechanisms are allowed. Booster mechanisms are allowed as well.

  • Maximum pressure supported is 50psi.

  • All energy given to the rocket must only come from the water/air pressure combination. No other source of energy is allowed.

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

  • Use of electronic components and chemical explosives are banned.

  • You are only allowed to use plastic bottles specifically designed for holding pressure, or that have been pressure tested (for example carbonated drink bottles).

  • No glass or sharp objects to be used in/on the rocket.

  • More than one bottle can be used but the maximum capacity of bottle/bottles should be 2.5L.

  • Only water should be used as the working fluid. No other fluid is allowed.

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

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

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

  • Participants should use only water provided by organizers.

  • Participants must use only the pump provided by organizers.

  • The decision of the organizers is final and binding.


Judging criteria:

The final judgment is based on the total points scored by the team in both the rounds described above.

  • The total points scored in both the rounds are added up and awarded as their final score.
  • The decision of the organizers is final and binding.

Design a water rocket that is completely powered by the thrust delivered by water expelled at high pressure, along with its launchpad.



Q) Can we change the volume/capacity of the bottle?

A)  No, The capacity of the bottle is fixed in all rounds as per the limits of the rules.


Q) What is the range of the target in the second round?

A) Around 50 Metres.


Q) Is there a time limit for pressure pump-launch for every water rocket attempt?

A) Yes. A maximum of 45 seconds under pressure loading before launching the water rocket.


Q) Can school students participate as well?

A) Yes. There are no restrictions whatsoever.


Q) Are there any prerequisites?

A) Building a water rocket is both fun and is quite an easy task. Basic designing and fundamentals in aeromodelling would be sufficient.


Q) Will launch pads be provided?

A) 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 get disqualified.


Q) Will any materials be provided on the spot?

A) 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 stationery shops on the campus.



1.Tirupathi lavuri: +91 91826 04087

2. Gopi: +91 96550 70081

3. Akash: +91 97171 28121


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