# # # Stability and maneuverability
* * * Front three-point landing gear * *: The two main wheels (fulcrums) of this landing gear are symmetrically placed behind the center of gravity of the aircraft, and the third fulcrums (front wheels) are located in the front of the fuselage. This layout makes the aircraft have good stability when it moves on the ground, because the center of gravity of the aircraft is located in front of the main wheel, which helps to prevent the aircraft from spinning in place when taxiing. At the same time, the front three-point landing gear is also convenient for pilots to conduct ground control, such as turning and braking. When landing, the front three-point landing gear is easier to operate, and when the plane moves on the ground, the fuselage is close to the ground, and the pilot's vision is better.
* * * Rear three-point landing gear * *: Two main wheels (fulcrums) are symmetrically placed in front of the center of gravity of the aircraft, and the third fulcrums (tail wheels) are located at the tail of the aircraft. This layout makes the stability of the aircraft moving on the ground poor, the aircraft is easy to spin in place, and it is difficult to control. Therefore, the rear three-point landing gear is rarely used in modern high-speed and high-mobility aircraft.
# # # Security
* * * Front three-point landing gear * *: Because of its good stability and maneuverability, the front three-point landing gear can provide higher safety during landing and taxiing. For example, when landing, if the actual speed is greater than the specified value, the angle of attack will be sharply reduced when the main wheel of the front three-point landing gear touches the ground, thus avoiding the phenomenon of "jumping" similar to that of the rear three-point landing gear. In addition, the front three-point landing gear also allows strong braking, thus reducing the taxi distance after landing.
* * * Rear three-point landing gear * *: Due to its poor stability and difficult handling, the rear three-point landing gear has certain safety hazards during landing and taxiing. For example, if the speed is too fast when landing, it is easy to "jump" and cause aircraft damage. At the same time, if you brake too hard during taxiing, it may also cause the plane to stand upside down (commonly known as "holding the top"), further increasing the danger.
# # # Scope of application
* * * Front three-point landing gear * *: Due to its superior performance, the front three-point landing gear has become the standard configuration adopted by most modern aircraft. Whether it is a civil airliner, a military fighter or other types of aircraft, the front three-point landing gear is widely used to improve safety and maneuverability.
* * * Rear three-point landing gear * *: Due to its many shortcomings and potential safety hazards, the rear three-point landing gear has been gradually replaced by the front three-point landing gear. At present, only a small number of small and low-speed aircraft still use the rear three-point landing gear layout.
To sum up, there are obvious differences between the front three-point landing gear and the rear three-point landing gear in actual operation. The former has become the mainstream configuration of modern aircraft because of its superior stability, maneuverability and safety; The latter is gradually eliminated because of its many shortcomings.
