Indian Military

The RPK-8 Antisubmarine Rocket System is designed to engage submarines, torpedoes and frogmen.
It comprises the RBU-6000 Rocket Launcher, antisubmarine rockets, fire control system, and storage, transportation and loading facilities.
The rocket with underwater projectile is fitted with a HE directional warhead. The projectile is separated from the rocket as soon as the latter enters the water.
Firing data are generated on the basis of target coordinates supplied by the ship sonars. The engagement mode (antisubmarine or anti-torpedo) to be performed by the rocket is pre-set at the fire control system and furnished to the rocket at the launch moment. The fire control system provides all the necessary data on the state of the launchers, mutual position of the host ship & target submarine and generates the firing data. The system transmits the data on the necessary laying angles to the launchers, ensures remote input of burst type & depth to the rockets and the command as to the number of rockets to be fired in a ripple of one, four, eight or twelve firings.

The RBU-6000 rocket launcher is fitted with 12 radially arranged tubes which contains the RGB-60 depth charge rocket. It is an unguided solid propellant projectile with an impact time fuse, which can be switched to impact or impact-time ignition. The maximum firing range is 6000 meters and maximum target submarine engagement depth is 500 meters. The rocket weighs 110 kg which includes a 25 kg explosive weight.

The RBU-6000 Smerch-2 is a 213 mm caliber Soviet anti-submarine rocket launcher. It is similar in principle to the Royal Navy Hedgehog system used during the Second World War. The system entered service in 1960-61 and is fitted to a wide range of Russian surface vessels. It consists of a horseshoe shaped arrangement of twelve launch barrels, that are remotely directed by the Burya fire control system (that can also control the shorter ranged RBU-1000). It fires RGB-60 unguided depth charges. The rockets are normally fired in salvos of 1, 2, 4, 8 or 12 rounds. Reloading is automatic, with indivigdual rounds being fed into the launcher by the 60UP loading system from a below deck magazine. Typical magazine capacity is either 72 or 96 rounds per launcher. It can also be used as a shore bombardment system.

90R Antisubmarine rocket (RPK-8 projectile)

The RPK-8 system is an upgrade of the RBU-6000 system, firing the 90R rocket, which is actively guided in the water. This allows it to home in on targets at depths of up to 1,000 meters. The warhead is a 19.5 kg shaped charge, which enables it to punch through the hulls of submarines. It can also be used against divers and torpedoes. System response time is reported to be 15 seconds and a single-salvo has a kill probability of 0.8. 90R rocket is intended for the homing underwater gravitational projectile delivery to the submarine location point. It can also be used as an anti-torpedo and anti-sabotage weapon. The antisubmarine rocket consists of a propulsion section, a warhead with a separation system and a gravitational underwater projectile.

RBU-6000 were the most widespread anti-submarine rocket launchers in the Soviet Navy, used on many ship classes.

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Launcher

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  RBU-6000 RPK-8 installed on a indian navy vessel

  Weight: 3,100 kg (empty)
• Length: 2 m
• Height: 2.25 m
• Width: 1.75 m
• Elevation: -15°to +60°
• Traverse: 180°
• Laying Speed, deg/s
  • in elevation : 27
  • in training : 27
• Performance: Hit Probability 80 %(source:deagel.com)

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RGB-60 Projectile

• Weight: 112.5 kg
• Warhead: 19.5-25 kg
• Diameter: 0.212 m
• Length: 1.83 m
• Range of Fire by Rocket RGB-60
  • maximum : 5230
  • minimum : 210
• Depth: 10 to 500 m
• Sink rate: 11.5 m/s
• Depth range:
  • Submarines: upto1,000 m
  • Torpedoes and divers: 4-10 m

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90R Antisubmarine rocket (RPK-8 projectile)

• Weight 112.5 kg
• Warhead: 19.5 kg
• Diameter: 0.212 m
• Length: 1.83 m
• Range of Fire by Rocket 90-R
  • maximum : 4300m
  • minimum : 600m
• Effective radius: 130 m
• Depth range:
  • Submarines: upto1,000 m
  • Torpedoes and divers: 4-10 m

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Ships

Ship classes fitted with RBU-6000

Indian

• Project 28 Anti-Submarine Warfare corvette
• Talwar Class Frigate (Upgraded Soviet Krivak Class)
• Shivalik Class frigate (Project 17 Class)
• {ln:rajput-class-guided-missile-destroyer 'Rajput Class Destroyer (Soviet Kashin Class)}
• {ln:type-15project-15-delhi-class-guided-missile-destroyer 'Delhi class Destroyer (Project 15 Class)}
• {ln:type-15a--project-15a-kolkata-class-guided-missile-destroyer 'Kolkata Class Destroyer (Project 15A Class)}

Other

• Grisha class corvette (Project 1124)
• Kara class cruiser (Project 1134B)
• {ln:rajput-class-guided-missile-destroyer 'Kashin class destroyer (Project 61)}
• ORP Kaszub corvette (Project 620)
• Koni class frigate (Project 1159)
• Kresta I class cruiser (Project 1134)
• Kresta II class cruiser (Project 1134A)
• Krivak class frigate (Project 1135)
• Kotlin-SAM class destroyer (Project 56K / A/ AE)
• Neustrashimy class frigate (Project 1154)
• Parchim class corvette (Project 133.1)
• Poti class corvette (Project 204)
• Udaloy class destroyer (Project 1155)

Source

• The Naval Institute Guide to World Naval Systems 1997-1998
• warfare.ru