Snowmobiles, bobsleds and steel-framed snowmobiles, what are the rules of competition for these three sports?

Snowmobiling is the sport of sliding on ice in a directionally steerable sled, and was included as an official event at the Winter Olympics in Chamonix in 1924. Sledding originated in the Swiss mountains and later became popular. Steel-framed snowmobiling originated in the Swiss mountain town of St. Moritz, and is an extension of traditional snowmobiling. It was included in the official program of the 1982 Winter Olympics in St. Moritz. The following are the rules for each of the three events:

The snowmobile race is divided into a two-seater and a four-seater, and each race is skated four times, with the total time of the previous four skates being used to calculate the score, and the one who takes the least time wins. When encountered two teams with the same cumulative time, any one of the four skidding as a judgment, in this skidding in the least amount of time spent on the team won. In the snowmobile race, the order of departure for the first round is determined by lot, and after the second round, the order of departure is determined by the last place of the previous round, and so on. Before the start, the sled is 15 meters away from the starting line. After hearing the start command, the athletes start to push the sled by hand and then jump into the seat. The front seat in the snowmobile is responsible for steering, and the back seat is responsible for providing power to start. When reaching the finish line, the athletes participating in each team must be in their seats, otherwise the team's results will be invalid.

The bobsled race requires athletes to ride a wooden or metal double sled skateboard on a dedicated snow and ice route at high speed sliding down, slewing, athletes sitting on the sled, hands with the help of the starting point to help the rail pushed backward hard and make the sled start. The length of the sled in the Winter Olympics shall not exceed 2.7 meters, the width shall not be more than 0.67 meters, the width of the skateboard is 8 millimeters, and the weight of the sled shall not be higher than 375 kilograms when the sled is sliding. In the bobsleigh race, the athletes have to skate four times, divided into two days of competition, each time skating twice, the first round is decided by drawing lots, after which they start in reverse order according to the results of the previous round, from the lowest to the highest. At the end of the four rounds, the cumulative time used in the four skids is used to calculate the final score, and the two teams with the same time are compared in the same way as snowmobiles.

There are two rounds of snowmobile racing, which are completed in one day, and the results of the two rounds are added together to calculate the total score, and those with the same score can be tied for the ranking. At the start, competitors line up at the starting point and start in order. After the start signal, competitors must complete the start within 30 seconds. Athletes can only perform the program in a prone position. Dropping the snowmobile in the middle of the program is allowed, and when passing the finish line, the athlete must be on the snowmobile in order to be considered valid.