Water Rocket Simulator

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: The next level of play with water rockets is landing it. Try it!

Landing Vessel of stage 1

Vessel capacity: Additional vessel which will act as an engine for breaking [ l ]

Water fill: This fuel mass is treated as additional dry mass during ascent, so should be as low as possible. Pick the value which will provide slowing down to 0 m/s [ l ] ( %)

Air pressure: Pressurised air fills free space in vessel and stores energy. Higher pressures requires tougher vessel [ bar ]

Nozzle diameter: During landing theres is less fuel onbard, so deceleration values will be higher [ mm ]

Landing burn starts at: Rocket must start breaking at specific height, so as the burnout occurs at the ground level [ m ]

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 ]

Landing attempt:

Landing Vessel of stage 2

Vessel capacity: [ l ]

Water fill: [ l ] ( %)

Air pressure: [ bar ]

Nozzle diameter: [ mm ]

Landing burn starts at: [ m ]

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 ]

Landing attempt: This is test of tooltip

Landing Vessel of stage 3

Vessel capacity: [ l ]

Water fill: [ l ] ( %)

Air pressure: [ bar ]

Nozzle diameter: [ mm ]

Landing burn starts at: [ m ]

Altitude [m]

Speed [m/s]

Acceleration [g]

Thrust [N]

Air pressure [bar]

Exhaust velocity [m/s]

Results
Dimension	Stage 1	Stage 2	Stage 3	Unit
Ascent
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				[ g ]
Initial thrust				[ N ]
Initial exhaust velocity				[ m/s ]
TWR*				[ - ]
Specific impulse				[ s ]
Landing
Burnout altitude				[ m ]
Burnout velocity				[ m/s ]
Landing burn time				[ s ]
Time from apogee to ignition				[ s ]
Landing burn delta v				[ m/s ]
Landing burn initial acceleration				[ g ]

Your rocket - height [cm]