Water Rocketry

Event Format

The hydro-rocket event will have two main round/stages for the participant. A team can have a maximum of 3 students. The members can be from different colleges.

ROUND 1: Endurance (Time of flight)

The water rocket can be launched from launch pad with any suitable angle as per your convenience and would be tested for maximum time of flight.

Point distribution for Round 1

  1. Number of points granted is equal to the time of flight measures in seconds multiplied by 10. (= time of flight in seconds * 10).
  2. A stopwatch will be used to measure the time of flight. The duration shall include the time when the rocket is launched and until it touches the ground in the first instance.

ROUND 2: Range

A specific range of the water rocket will be tested in this round. The rocket has to hit a provided target range marked on the ground as concentric circles. The centre of the circles lies at a distance of 50 m from the launch point.

Point distribution for Round 2:

  1. The circular arena is divided into 3 concentric circular regions with radius of 2m, 4m and 6m.
  2. The inner Region A (radius 2 m) holds 100 points.
  3. The next Region B (radius 2-4 m) holds 75 points.
  4. The last Region C (radius 4-6 m) holds 50 points.
  5. No points will be awarded if the water rocket lands outside the arena.
  6. The front tip of the water rocket will be considered as the point where the rocket has fallen on the ground. For this round, the position of the rocket once it comes to rest in considered and not the point of first contact with the ground.

Model Specifications

  1. Water Rocket and all of its components should be handmade. Readymade models are strictly not allowed.
  2. Your model can be of any size or shape and can be made of any material. But, it should not damage the arena or hurt any person. If your model is found dangerous, you will not be allowed to participate in the event.
  3. The water rocket may contain any of the following mechanisms suitable for different rounds:
    1. Parachute mechanism
    2. Gliding (wings type) mechanism
    3. Booster mechanism: in this case, participants should ensure that they have proper launchers supporting the launching mechanism
    4. Any other innovative mechanism is encouraged provided that the material and mechanism used is not harmful or dangerous to any person in the field. In this case the decision of organizers will be final and no queries will be entertained in this regard.
    5. Teams are allowed to use more than one model for different rounds but must maintain the same model during the round. However, it is upon the team to choose what model to use for different rounds according to the mentioned rules.
  4. Use of electrical/electronic components is strictly prohibited. The mechanism should be purely mechanical.


  1. The participants will be given three trials for round 2 out of which the best will be considered for the final judgment of that round.
  2. Only water and air can be used as propellants.
  3. Maximum pressure allowed is 70 psi.
  4. Air pump will be provided on the spot for pressurizing the water rocket.
  5. The team will be disqualified in case the bottle bursts while pressurizing and is still mounted on the launcher.
  6. Participants are allowed to use separate models for round one and two but the same model has to be used throughout a given round.
  7. Total Points for the Competition is equal to the sum of Round 1 points and Round 2 points.
  8. In event of any clash of final points a tiebreaker will be held between the concerned teams.
  9. The clashing teams will have to go through the second round until the points differ.
  10. The top three teams will be granted certificates and prize money. Criteria: points scored in Round 1 and Round 2.
  11. Participants are supposed to get their own launching pads which cannot be shared with other teams.
  12. The decision taken by the judges is final and binding.