You could use other non compressible liquids. You really are using the air trapped in the rocket as the energy source. The water compresses the air to very high levels and then is pushed back out the enf of your rocket.
Water rockets need fins because the rocket needs to stay in balance....without fins on a water rocket, the water rocket would be going out of control because it is not in balance!
no
to make it stand up
water is needed to keep the air in until the water is expelled out.
crazy abdullah's face
Water, an empty plastic bottle and an air pump.
i think about 220 would be a good amount
a rocket powered by water
it will become an air powered rocket
the rocket is pushing water downwards which means that the water pushes the rocket upwards very hard that it can overcome gravity and fly.
A water rocket does not necessarily need fins to fly, but they can significantly improve stability and control during ascent. Fins help to ensure that the rocket maintains a straight trajectory by counteracting any rotational or lateral movement. Without fins, the rocket may still launch and ascend, but it may veer off course or tumble, reducing its overall flight performance. Ultimately, while fins are not required, they enhance the rocket's aerodynamic efficiency.
big rocket