| Yu-4 Torpedo | |
|---|---|
| Type | Heavyweight ASuW torpedo |
| Place of origin | China |
| Service history | |
| In service | 1982(Yu-4A) 1987(Yu-4B) |
| Used by |  People's Liberation Army Navy Bangladesh Navy Korean People's Navy |
| Production history | |
| Designer | CSSC |
| Designed | early 1960s – December 1982 |
| Manufacturer | Pinyang Machinery Factory, Houma, Shanxi |
| Produced | 1982 - |
| Variants | Yu-4A,Yu-4B |
| Specifications | |
| Mass | 1,775 kg (1,628 kg for the training version) |
| Length | 7.75 m |
| Diameter | 533 mm |
| Warhead weight | 309 kg |
| Engine | electrical, silver-zinc battery |
Operational range | 6 km (original) at 30 knots (56 km/h) 15 km (upgraded) @ 40 knots (74 km/h) |
| Maximum speed | 30 knots (56 km/h) or 40 knots (75 km) upgraded |
Guidance system | acoustic homing: Yu-4A: passive, Yu-4B: active/passive |
Launch platform | Submarine |
Yu-4 (鱼-4) torpedo is the Chinese development of the Russian SAET-50 ASuW passive acoustic homing torpedo, and it is the Russian SAET-50 torpedo incorporating active acoustic homing guidance. Yu-4 torpedo is often erroneously claimed by many sources as the Chinese version of the SAET-60 acoustic homing torpedo,[1] but Soviets had not completed the development of SAET-60 and only fielded the weapon in 1961, by then the relationship between former-Soviet Union and China had already worsened and China had not received any technical assistance on SAET-60 torpedo. The background of the development of Yu-4 torpedo is identical to that of Yu-1 torpedo and Yu-2 torpedo.
- ^ Norman Friedman. The Naval Institute Guide to World Naval Weapon Systems.