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Planes can fly because of lift. According to Bernoulli's principle, the higher the fluid velocity, the lower the pressure. When the lift force is greater than the weight of the aircraft, the aircraft can fly. When the flow decreases, the pressure increases, and the lift is less than the weight of the aircraft, the aircraft can descend and land. Therefore, when the plane takes off, it must move forward at high speed. The faster the plane moves, the greater the lift. Principle of aircraft take-off: The airfoil of the aircraft wing is specially designed. When air flows over the upper and lower surfaces of a wing, the distance between the upper surfaces is longer than the distance between the lower surfaces, and the airflow speed on the upper surface is faster than that on the lower surface. According to Bernoulli's theorem, the pressure is low where the speed is high, and the pressure is high where the speed is low. Therefore, the pressure on the lower surface is higher than that on the upper surface, creating a pressure difference, which is the lift force that makes the aircraft fly. Aircraft power source: The aircraft power device is used to generate pull (propeller aircraft) or thrust (jet aircraft) to push the aircraft forward. Power units with thrust vectoring can also be used for maneuvering. Most modern military aircraft are jets. The power plant of jet aircraft is mainly divided into turbojet engine and turbofan engine. Aircraft structure 1. Fuselage The fuselage is mainly used to load personnel, cargo, fuel, weapons and airborne equipment, and through it, it connects the wings, tail, landing gear and other components into a whole. In light aircraft, fighters and attack aircraft, the engine is usually mounted on the fuselage. 2. Wings Wings are the main components used to generate lift on an airplane. They are generally divided into left and right wing surfaces. Wings usually include flat wings, swept wings, delta wings, etc. The front and rear green wings are basically flat, and the front and rear edges of the wing are swept back, called swept wings. The plane shape of the wing is triangular and is called a delta wing. The former is suitable for low-speed aircraft, and the latter two are suitable for high-speed aircraft. Recently, advanced aircraft have adopted planar shapes such as strakes and forward-swept wings.