According to a report by the British “Daily Mail” on February 21, the head of the newly established British space force told the media that “the British Royal Air Force’s Typhoon fighter jets may be deployed to the “edge of space” to destroy the military use of Russia and China. satellite”.
This statement of the British military gives people a feeling that British pilots can really fly Typhoon fighters to places where they can see the universe, posing a threat to Chinese and Russian satellites. In fact, the truth is completely different.
First of all, it is impossible for a typhoon fighter to fly to the “edge of the universe.” The dividing line between air space and cosmic space is 100 kilometers above sea level, which is also known as the von Kamen line. This number was not figured out by scratching my head. As the tutor of Mr. Qian Xuesen, von Kamen has made groundbreaking achievements in aerodynamics and orbital dynamics. We know that when an airplane flies in airspace, it depends on the relative movement of the fuselage and wings with the air to generate lift. The greater the altitude and the thinner the air, the faster the airplane must fly to generate enough lift. But at an altitude of 100 kilometers, the flight speed must exceed the first cosmic speed of 7,800 meters per second in order to generate lift that exceeds its own weight. However, at this speed, the aircraft enters orbital flight. The principles of aerodynamics are no longer applicable. Orbital dynamics should be used to analyze the trajectory.