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My favorite site that has super detail on how to build water rockets is Air Command out of Australia. These guys put amazing effort into their water rocket construction but I would say even double that in documenting everything they do wish make their site so valuable as a resource for water rocketry.
We will continue to post updates on their progress. They have some amazing water rockets like the Polaron IV which uses an eight (8) liter main stage that gets its thrust from a 7mm nozzle and three Gluon side 2.1 liter booster rockets that use 13mm nozzles on each booster.
The video of the launch below is spectacular and shows how the Pilaron IV handles with 2 liters of water in the main booster at 110 psi and 1 liter in each of the side boosters pressurized to 110 psi.
The genius of the booster rockets is that they separate from the main booster once they have spent their supply of water propellant. As the Polaron IV reaches its apex the parachute deploys and since this water rocket is equipped with an onboard video camera and altimeter you can see the action directly from the rocket.
Highlights from the Polaron IV water rocket flight tests.
Video of setting up and launching J4 IV, Hyperon, and finally the Polaron IV on its maiden flight.
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