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Airplanes can fly because of lift. According to Bernoulli's principle, the higher the fluid speed, the lower the pressure. When the lift is greater than the weight of the airplane, the airplane can fly. When the flow decreases, the pressure increases, and the lift is less than the weight of the airplane, the airplane can descend to land. So when an airplane takes off, it must move forward at high speed. The faster the airplane moves, the greater the lift. Principle of airplane takeoff:The airfoil of an airplane wing is specially designed. When air flows over the upper and lower surfaces of the wing, the distance between the upper and lower surfaces is longer than the distance between the upper and lower surfaces, and the airflow over the upper surface is faster than the lower surface. According to Bernoulli's theorem, the pressure is lower where the speed is high and higher where the speed is low. So the pressure on the lower surface is higher than that on the upper surface, creating a pressure difference, which is the lift that makes the airplane fly. Aircraft power sources:Aircraft powerplants are used to generate either pull (propeller planes) or thrust (jet planes) to propel the airplane forward. Powerplants with thrust vectoring can also be used for maneuvering flight. Most modern military aircraft are jets. The powerplants of jet airplanes are mainly categorized into turbojet engines and turbofan engines. Aircraft Structure 1.FuselageThe fuselage is mainly used for loading personnel, cargo, fuel, weapons and airborne equipment, and through which the wings, tail, landing gear and other components are connected into a whole. In light aircraft, fighters and attack aircraft, the engine is usually mounted on the fuselage.2. WingsThe wings are the main parts of an airplane used to generate lift, and are generally divided into left and right airfoils. Wings are usually flat, swept-back, or delta wings. The front and rear green wings are basically flat, and the front and rear edges of the wing are swept back, which is called a swept back wing. The flat shape of the wing is triangular and is called delta wing. The former is suitable for low-speed airplanes and the latter two for high-speed airplanes. Recently, advanced airplanes have adopted planar shapes such as side strip wings and forward swept wings.