Dart with telescopic tail wing

A dart with a telescopic tail wing, comprising a dart rod, a dart head disposed at a front end of the dart rod, and a tail wing disposed at a rear end of the dart rod, wherein the tail wing is movably disposed on the dart rod, a tail wing connecting part is disposed at the rear end of the dart rod and comprises a sleeve and multiple wing blades disposed on the sleeve, a clamping part is disposed on the tail wing connecting part, a limiting part is disposed in the sleeve, the tail wing connecting part is inserted into the sleeve, the clamping part stretches from one side to another side of the limiting part and is matched with the limiting part, and an elastic piece is disposed around the tail wing connecting part and is located between the limiting part and the dart rod;

• a telescoping cavity is formed between a bottom of the sleeve and the limiting part, and the clamping part is located in the telescoping cavity;
• the ratio of a depth of the telescoping cavity to a height of the clamping part, is 10:1-2:1, and the limiting part is an annular protrusion circumferentially disposed on an inner wall of the sleeve;
• a front end of the tail wing connecting part is connected to the dart rod, and the clamping part is disposed at a rear end of the tail wing connecting part;
• and the clamping part comprises at least two elastic clamping blocks disposed at the rear end of the tail wing connecting part, and a gap is formed between every two adjacent said elastic clamping blocks.