Tutorial on making a hydrodynamic boat using the power generated by water level difference.
1. Find three mineral water bottles, punch a small hole in the bottom of one of them as shown in the picture below, and put a piece of ballpoint pen tube through it
2. Tie the other two mineral water bottles to both sides of the holed bottle, so that the middle bottle is exactly in the center of the other two bottles (finding the balance point is a delicate and complicated process, otherwise, the middle bottle will When filled with water, it will roll over)
3. Fill the middle bottle with water, and the boat will move forward under the power generated by the water level difference!
