“…When the line is pulled first, it can cause the line sail phenomenon, also called the line bowing or fish hooking phenomenon, as shown in Figure 1. It can have an adverse effects on the inflation process of the main parachute, and Moog et al [38], Purvis et al [39,40], Johnson et al [41], Peterson et al [42], and Maydew et al [43] have made detailed studies of it. They discussed six situations: prolonged opening time, collision between the parachute bag and the canopy, high cord straightening force, asymmetric opening, wear of the canopy by the parachute bag, and unpredictable parachute inflation.…”