Steps of making airplane with disposable paper cups

Steps of making airplane with disposable paper cups:

1, the two bottom cups are opposite and glued with adhesive tape.

2. Four rubber bands tied together

3. Hold one end of the rubber band by hand and tighten it slightly around the middle of the two paper cups. After releasing the hand holding the paper cup, the paper cup plane can fly.

What is the scientific principle of paper cup flying machine?

The reason why paper cups fly must be caused by external forces, nothing more than airflow, mechanical force, negative pressure and so on.

Airflow is an academic term in meteorology. Especially the vertical movement of air. The flow of air (wind). Its speed is expressed in meters per second (m/s).

The reason of air flow is the temperature difference caused by uneven heating. Hot air rises slightly, supplemented by cold air flow, forming convection. The air in the production site is heated by the heat source in the workshop, which expands in volume and reduces in density. Will be discharged to the outside through the upper air outlet, and the outdoor cold air will enter the room through the side window or side door, forming an airflow. The influence of atmospheric wind pressure on the factory building will also cause indoor airflow.