Water Rocket Simulator

By Voytex

Design and test your water rocket, even with stages!

Number of stages: Multistage rockets can fly higher, but are more difficult to build

Units: metric

Stage 1

Vessel capacityVolume of rocket's fuel tank. Bigger capacity means more space for water and compressed air [ l ]
Water fill Water is fuel which thrown out through the nozzle propels the rocket. Although too high volume causes bigger weight needed to lift and takes overs space for compressed air. Find easily optimal value with slider [ l ] ( %)
Rocket's dry mass The lighter rocket is without fuel, the higher speed it can reach due to rocket equation. Mass of upper stages and it's fuel is added in calculations to dry mass in lower stages [ kg ]
Air pressure Pressurised air fills free space in vessel and stores energy. Higher pressures requires tougher vessel [ bar ]
Drag coefficient Depends on fins and nose shape. Higher coeficient results in higher drag force. Usually it is determined experimentally [ - ]
Rocket's diameter The larger rocket's diameter is the harder air drag is affecting the rocket. Wider rockets provide more volume, but smaller ones can withstand higher pressures [ mm ]
Nozzle diameter Wider nozzle results in faster empting vessel and higher thrust force, but it generates also higher loads on rocket structure [ mm ]
Launch tube length Launch tube is the most efficient way to accelerate rocket. Can be as long as the first stage vessel [ mm ]
Launch tube diam. Bigger is always better - generates more thrust, but lunch tube can has at most same diameter as nozzle [ mm ]

Landing attempt:

Water reserve for landing: [ % ]

Stage 2

Vessel capacity [ l ]
Water fill [ l ] ( %)
Rocket's dry mass [ kg ]
Air pressure [ bar ]
Drag coefficient [ - ]
Rocket's diameter [ mm ]
Nozzle diameter [ mm ]

Stage 3

Vessel capacity [ l ]
Water fill [ l ] ( %)
Rocket's dry mass [ kg ]
Air pressure [ bar ]
Drag coefficient [ - ]
Rocket's diameter [ mm ]
Nozzle diameter [ mm ]

Altitude [m]

Speed [m/s]

Acceleration [m/s^2]

Thrust [N]

Results

Dimension Stage 1 Stage 2 Stage 3 Unit
Altitude [ m ]
Top speed [ m/s ]
Speed at Burnout* [ m/s ]
Delta v from air pulse [ m/s ]
Time to reach apogee [ s ]
Time to Burnout [ s ]
Burnout altitude [ m ]
Initial acceleration [ m/s^2 ]
Initial thrust [ N ]
Initial exhaust velocity [ m/s ]
TWR* [ - ]
Specific impulse [ s ]

Your rocket - height [cm]

* Burnout - occurs when all the water escapes from the rocket

* TWR - Thrust to Weight Ratio

WARNING: