Essentially your water bottle is the combustion
chamber of a more traditional rocket.
What would happen if you filled the bottle rocket
with water and launched it?
We can try this without getting wet!
Most wind tunnels are horizontal. Ours is vertical
so that the water stays at the bottom of the bottle, just as it
would during launch.
The clamp holding the bottle in place is actually
a pivot, allowing the bottle to spin if conditions aren’t
correct. It is attached to the bottle at the bottle’s Center
of Gravity (CG). That’s the balance point for any object…the
weight of the object is equally distributed on either side of that
point.
