In the field of fishing equipment, the long-distance casting reel is the core tool for long-distance casting, and its performance directly affects the success rate of fishing. The design of the spool, especially its shape and depth, has become a key factor affecting the casting effect. The spool is not only a storage space for the wire, but also a core component to ensure the smoothness of line release and improve the casting distance and accuracy.

Characteristic analysis of the shape of the spool
The design of the spool can be divided into two types: deep cup and shallow cup, each with unique advantages and applicable scenarios.
Deep cup design: The structure of the deep cup allows more wire to be stored, which is particularly suitable for fishing environments that require long line distances. The deep cup can effectively reduce the twisting and knotting of the coil during casting, thereby achieving smoother line release. In addition, when using heavier wire, the deep cup can better maintain the stability of the wire and reduce the risk of wire entanglement during casting. This design is particularly suitable for anglers who fish at sea or work under strong water conditions, providing greater pulling force and control capabilities.
Shallow cup design: Compared with the deep cup, the shallow cup is lighter and suitable for lighter wire and small fishing gear. Although the shallow cup has some limitations in terms of line capacity, its superior aerodynamic design can effectively reduce air resistance during casting, thereby improving the distance and accuracy of casting. For anglers who pursue fast and flexible casting, shallow cup reels are often a more ideal choice, which can make multiple casts in a short period of time and adapt to fast-moving fish.

The performance impact of the line cup depth
The impact of the line cup depth on casting performance is mainly reflected in the following aspects:
Line storage capacity: Deep cups can accommodate more line, which is particularly important when casting over long distances. Especially in sea fishing or when it is necessary to overcome water resistance, longer lines not only provide greater tension, but also enhance the angler's control over the line.
Line stability: Deeper line cups can effectively prevent excessive bending and twisting of the line during casting, ensuring that the line remains stable. This stability is particularly important for anglers using heavier fishing tackle, because heavy fishing tackle will generate greater impact when casting, and deep cups can provide more solid support.
Reduce the risk of line entanglement: The deep cup design can significantly reduce the risk of line entanglement during casting. Since the line is easier to keep straight in the deep cup, it reduces friction and resistance during the release process, which significantly improves the smoothness and success rate of casting.

The relationship between the shape of the line cup and the casting angle
The shape of the line cup not only affects the storage and release of the line, but is also closely related to the casting angle. The different shapes of the line cup will cause the release angle and speed of the line to change during casting, which will affect the distance and accuracy of casting.
Deep cup and casting angle: The deep cup design usually provides a higher casting angle, which is particularly important when long-distance casting is required. The higher casting angle allows the line to fly a longer distance in the air and reduces the friction between the line and the air, thereby improving the efficiency of casting.
The flexibility of the shallow cup: The shallow cup design is more suitable for fast casting, allowing anglers to make multiple casts in a short period of time. This flexibility is extremely important in certain specific fishing scenarios, especially when chasing fast-moving fish, and can quickly adjust the casting strategy to increase the chance of catching.