Bicyclic rings can reach a diameter of 1 cm, a height of 8 cm, a diameter of 2.5 cm 14 cm and a diameter of 4 cm and a height of 26 cm. Shuangxiangzi is a traditional folk product, which is often used in festivals, weddings, memorial ceremonies and other occasions. It is based on the principle that the reaction force generated by the bottom powder hitting the ground takes off.

Introduction of double ringers

Double masts, also called two kicks, are a kind of firecrackers, and their gunpowder is separated by cement. The back door at the bottom was not blocked tightly, and the airflow generated by the explosion of the lower gunpowder rushed out of the back door and sprayed downward. The downward jet of air generates upward thrust, pushing firecrackers into the air. At this time, the fuse just ignited the gunpowder sealed at the top, and it quickly burned and exploded. It kicked two feet in mid-air and blossomed with a bang. Fireworks also rely on the rapid combustion of gunpowder, and the thrust generated by the explosion is lifted to the sky.

Regardless of the size of the kick, it is dangerous to detonate. Inferior skirting boards are prone to air leakage and moisture, which will lead to two explosions on the ground, or only one.

In short, kicking two feet is to wrap gunpowder in dense paper, and use the expansion generated by gunpowder explosion to blow up the paper and make a sound. Because there are two sounds, it is called two kicks.