First of all, from a physical point of view, a "breath" before takeoff helps to keep the fuselage level, which can make the plane fly in the air for a longer time. As we all know, the nose of a folding paper plane is relatively sharp and its area is relatively small, which also makes the nose weight and fuselage uneven, leading to unstable flight. After the plane snorted before taking off, the nose became heavier due to the influence of water vapor, which increased the resistance of air to the nose. Aerodynamically, the nose of the plane becomes heavier and the fuselage is relatively stable, which greatly increases the flight time. Of course, wouldn't it be better to breathe more? Actually, this is not right. Simply "exhaling" will cause the nose to be overweight, and the plane will roll backwards, and most of them will plummet.
Remember, some scientists have proved that the flight distance depends on the stability of the aircraft, and the weight on the wing moves the center of gravity forward, so the aircraft is more stable. When the center of gravity of the paper plane falls in front of the geometric center point, the plane can fly stably; But after landing at the geometric center, the fuselage will be unstable. Many people who have played paper airplanes know that the geometric center of a delta wing paper airplane is about half of the fuselage, and that of a quadrilateral wing paper airplane is about a quarter of the front of the fuselage. But how to keep the center of gravity stable is not easy.
With the change of nose weight, the center of gravity of the aircraft moves forward after "Ha-Ha", so the distance can be increased by 10% to 15%. But the flight of the plane only affects the distance, not the height. In other words, maintaining the stability of the plane can only make the paper plane fly farther, and the height only depends on the height of the plane you throw. This is because the humidity in front of the paper plane increases, which is limited by the distance of the plane.