Aircraft skydiving project. During the free fall from jumping off the plane to opening the parachute, the skydiver completes the required aerobatics in the air with the help of aerodynamics. The skydiving altitude is 2200 meters. There are four sets of prescribed movements, each set consists of four 360-degree turns and two 360-degree backflips. Generally, the competition lasts for 3-5 rounds, and each jump makes a set of movements. The referee records the completion time of the whole set of movements (accurate to 1% seconds), and gives different "penalty seconds" to the non-standard movements according to the degree. Every achievement is the time to complete the action plus "penalty second". The sum of the results in each round is the individual total score, and the one with less time wins. The stunt records the time to accurately complete a set of prescribed actions, and there are no irregular actions in it.