The Yu-4 is a Chinese copy of the Soviet/Russian SAET-60 electric-propelled, acoustic-homing anti-ship torpedo. Shown in the photo is the passive acoustic-homing variant Yu-4A. 鱼-4是苏联/俄国SAET-60电-推进、声导反舰鱼雷的一种中国仿造型。在相片中显示是被动声导鱼-4A型。

The Yu-4 is a Chinese copy of the Soviet/Russian SAET-60 electric-propelled, acoustic-homing anti-ship torpedo. Two variants have been developed including the passive acoustic-homing variant Yu-4A and the active/passive acoustic-homing variant Yu-4B. The torpedo entered service in the mid-1980s and is carried by the Type 035G (modified Ming class) and Type 039 (Song class) diesel-electric submarines.

鱼-4（Yu-4 ）是苏联/俄国SAET-60电动、声导反舰鱼雷的一种中国仿造型。二种改型已经被发展，包括被动声导鱼-4A型和主动/被动声导鱼-4B型。鱼雷在1980年中期进入了服役，被035G型（明级改进型）和039型（“宋”级）柴电潜艇携带。

PROGRAMME

China received the acoustic-homing torpedo technology from the Soviet Union in the late 1950s, and began the reverse-engineering work in 1958. The development of the Type 920 electric powerplant for the torpedo succeeded in the early 1960s. However, the Yu-4 programme was postponed in 1963 as the priority was given to the development of the unguided wet heater Kerosene-air torpedo.

计划

中国在1950年后期获得了来自苏联的声导鱼雷技术，并且在1958年开始了反向-工程工作。发展用于鱼雷的920型电动装置在1960年早期成功。然而，鱼-4计划在1963年被延期，因为优先权给予去发展鱼-1非制导煤-气湿式加热器推进鱼雷。

The Yu-4 development programme was resumed in 1966, with the prototype finished in 1971. Unfortunately this design was rejected by the PLA Navy due to its poor performance. Later the PLA navy decided to develop a passive acoustic-homing variant Yu-4A and a joint active and passive acoustic-homing variant Yu-4B. The development work was carried out by Northwest Polytechnic University (NPU) and Dongfeng Factory respectively, with Pingyang Machinery Factory being the primary contractor and manufacturer for both variants.

鱼-4发展计划在1966年重新开始，在1971年原型完成，不幸地这一个设计由于性能不足被PLA海军拒绝了。稍后PLA海军决定发展被动声导鱼-4A型和联合主动/被动声导鱼-4B型。发展工作分别由西北工业大学（NPU）、东风（Dongfeng）工厂和平阳（Pingyang）机械工厂进行，做为主承包人和制造厂用于两者改进型。

The passive acoustic-homing Yu-4A succeeded in February 1984, and entered service with the PLA Navy in the same year. The torpedo is carried by the Type 035 (Ming class) and Type 039 (Song class) diesel-electric submarine. The Yu-4B with active/passive acoustic-homing received its design certificate in February 1984, but may have not entered service. The Yu-4B has been promoted to the international market under the name ET31.

在1984年2月被动声导鱼-4A完成，而且在同一年进入PLA海军服役。鱼雷被035型（明级）和039型（“宋”级）柴电潜艇携带。鱼-4B采用主动/被动声导，在1984年2月接受了设计证明书，但是可能没有进入服役。鱼-4B已经被推销到国际市场命名为ET31。

DESIGN

The Yu-4 is a submarine-launched, heavyweight, acoustic-homing torpedo designed to engage surface ships. The torpedo is powered by an electric propellant using silver-zinc battery, giving a maximum speed of 30kt. The torpedo has a range of 6km and is armed with a 309kg warhead.

设计

鱼-4是一种潜艇发射重型、声导鱼雷，设计去交战水面舰艇。鱼雷采用一种电推进提供动力，使用银-锌电池，最大速度30节。鱼雷射程6公里并且配备一个309公斤弹头。

SPECIFICATIONS

Calibre: 533mm
Length: 7,748mm
Weight: 1,755kg (combat torpedo); 1,628kg (training torpedo)
Warhead: 309kg
Propellant: Electric (silver-zinc)
Speed: 30kt
Range: 6km
Depth of Search/attack: 5~45m
Guidance: Passive acoustic homing (Yu-4A); Active/passive acoustic-homing (Yu-4B)

规格

口径： 533 毫米
长度： 7,748 毫米
重量： 1,755 公斤（战斗鱼雷）；1,628 公斤（训练鱼雷）
弹头： 309 公斤
推进： 电动（银-锌）
速度： 30 节
射程： 6 公里
搜索/攻击深度： 5~45 米
制导： （鱼-4A）被动声导；（鱼-4B）主动/被动声导