First of all, the method of making paper rockets.

1, material preparation

You need to prepare a piece of A4 paper, scissors, glue or double-sided tape, scotch tape and pigment (optional).

Step 2 fold the arrow body

Fold A4 paper in half and cut out a rectangle with a length of about 10 cm and a width of about 8 cm, which is the main part of the rocket.

Step 3 make arrows

Fold a triangle at the top of the paper and fold its bottom at the top of the paper to form an arrow shape.

Step 4: Make a tail

Fold a rectangle at the bottom of the paper and fold its top at the bottom of the paper to form a tail.

5. Paste the arrow body

Stick the arrow body and the arrow tail together to ensure that they are firmly stuck together.

Step 6 decorate the rocket

You can color the rocket with pigments to enhance its aesthetic feeling.

Second, the launching principle of paper rocket

1, Newton's third law: When a rocket ejects gas downward, the gas reacts on the rocket and makes it move upward.

2. Law of Conservation of Mass: When a rocket is launched, the mass will decrease because part of it is ejected. This mass loss reduces the inertia of the rocket, so it is easier to change its motion state.

3. Aerodynamics: When the rocket ejects gas downward, the gas generates upward reaction force to the rocket. This reaction is in balance with the gravity of the rocket, which makes the rocket move upward.

Optimization of paper rocket

First, increase the propellant

By increasing the mass or flow rate of propellant, the upward thrust of rocket can be increased. This can be achieved by folding many times or using heavier materials.

Second, reduce quality.

By reducing the mass of a rocket, its acceleration and speed can be increased. This can be achieved by using lighter materials or reducing unnecessary parts.

Third, adjust the center of gravity.

By adjusting the center of gravity of the rocket, its inertia and stability can be changed. If the center of gravity of the rocket is too forward, it may roll; If the center of gravity is too far back, you may dive. Need to adjust the center of gravity position according to the actual situation.