The ideal material for the main cable of the deceleration umbrella is super carbon fiber. According to the data, the strength of super-grade carbon fiber can reach 100 times that of ordinary steel, but the density is only 1/6 of that of steel. But even if this material can be put into practical use, its price is very expensive, not conducive to promotion.
In addition, at present, the material used as the main cable of the deceleration umbrella is mainly high-strength and high-modulus polyethylene fiber. The tensile strength of this material is more than 10 times that of high-quality steel. The cable with a diameter of 1cm can bear 50 tons of pulling force, that is, 64 tons of pulling force per square centimeter.
Furthermore, the lower end of the main cable of the deceleration umbrella is the most stressed and the upper end is the smallest. Therefore, the diameter of the lower end (the end connected to the aircraft) is generally 2cm, the diameter of the upper end (the end of the guide umbrella) is generally 1cm, and the average diameter is 1.5cm (the radius is 0.75cm). When making cables, the diameter of the cables is uniform and excessive from large to small. The cross-sectional area of the fixed end of the main cable is about 3.14 square centimeters, and the tensile force that can be borne is: 3.14*64 tons = 200 tons, so it can definitely meet the requirements of decelerating the aircraft.
Finally, when it comes to the speed of the aircraft so fast, suddenly open the umbrella, will it be harmful to the fuselage, this is for sure! Therefore, under what circumstances (or only what conditions are available) can the umbrella be opened, which is strictly required. For example, the speed of the aircraft (this is the main factor, when the speed is high, opening the umbrella may cause the engine to stop suddenly, which is very dangerous. In addition, the sudden deceleration of the aircraft can also cause damage to the fuselage structure), so it is generally stipulated that the parachute can only be opened when the speed of the aircraft reaches below a certain value.

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