Surujin — スルジン (Weighted Chain)
The surujin (スルジン, also written 石投 or 鎖) is a flexible weapon consisting of a rope, cord or chain with weighted ends. It is the only weapon in the Taira curriculum that extends the practitioner's effective range beyond arm's reach through projectile-like throwing and entangling techniques.
Physical Characteristics
| Property | Detail |
|---|---|
| Length | ~180–210 cm total |
| Weights | Stones, metal weights, or shaped metal ends |
| Material | Rope (traditional) or chain (modern) |
| Variants | Tan surujin (short, ~60 cm) and naga surujin (long, ~210 cm) |
Technique
The surujin is used in several ways:
- Swinging and throwing — the weighted end is swung to build momentum and cast at a target's limbs or weapon
- Entangling — wrapping around an opponent's arm, leg, or neck
- Striking — using the swinging weight as a flail-type impact weapon
- Controlling — a caught limb is pulled off-balance while the other end is ready to strike
The weapon demands significant practice to control because the dynamics of a spinning weighted chain on the end of a rope are unpredictable for beginners.
Kata in the Taira Curriculum
- Surujin no Ichi (スルジンの一)
- Surujin no Ni (スルジンの二)
Historical Context
The surujin is likely related to the throwing-stone traditions documented in Okinawan and Chinese military records. The Tsuken sand-throwing techniques preserved in Tsuken Sunakake no Kon (usually classified as an eku kata) show the same conceptual logic: range extension and distraction through thrown or swung objects.
Detailed kata analysis and historical source connections will be added here.