Mk 36 SRBOC

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Two Mk 36 SRBOC on board the battleship Iowa , in the background the frigate Bremen

The mark 36 srboc ( S uper R apid B loom O ffboard C ountermeasures, German about: fired from board quickly deploying countermeasures ) is a decoy system for marine use. The full name is Mark 36 Super Rapid Bloom Offboard Countermeasures (SRBOC) Chaff and Decoy Launching System , but is also called Mk 36 DLS (Decoy Launching System) or Mk 36 Super-RBOC .

With the conversion to the last generation of decoys, the Nulka , the designation was changed to Mk 53 DLS .

The Mk 36 is a further development of the Mk 33 RBOC with expanded capabilities. The system is used by at least 19 navies and is available in different versions and further developments ("Mods"). The last model at the moment is the Mk 36 Mod 12 .

Development and construction

The USS Tarawa fires two decoys
The Japanese destroyer Yamayuki (DD-129) after ejecting flares

The SRBOC was originally developed by United Defense , now part of BAE Systems Land and Armaments , and has been in operational use since 1977. Around 848 systems had been produced up to 1999. The estimated cost of a Mk-36 with two launchers in 1999 was $ 500,000 and with four launchers it was around $ 800,000. The Mk-36 system will continue to be procured.

The complete Mk-36 system consists of at least two Mk-137 launchers , an Mk 160 Mod 1 power supply and an Mk 5 or Mk 6 ammunition magazine per launcher, the Mk 158 Mod 1 or Mk 158 Mod 2 launch control in the operations center ( Combat Information Center, CIC for short), which is usually connected to the AN / SLQ-32 electronic warfare system , the bridge control Mk 164 Mod 1 or Mk 164 Mod 2 , and a number of different types of ammunition. The SRBOC can be controlled from both the bridge and the CIC.

The SRBOC is mostly used for larger surface units. A pair of launchers is normally used on ships up to 166 meters (500 ft) in length, and correspondingly more for larger units.

A single Mk-137 launcher consists of six launcher tubes arranged in two parallel rows. The launcher is built in two versions for use on port and starboard and weighs 207 kilograms unloaded. While all pipes up to and including Mod 1 were arranged at 45-degree angles, since Mod 2 the pipes have been arranged at angles of 45 and 60 degrees. The 130 mm caliber flares are fired from each of the mortar-like tubes . Since the launchers or launching tubes cannot be aimed and so the ammunition is fired at a fixed lateral and elevation angle, the ship has to maneuver in order to align the launchers to the intended target. The propellant charges are ignited by electromagnetic induction . The Mk-137 launcher's muzzle velocity of the decoys is around 75 meters per second.

The Mk-160 power supply converts the 440-volt alternating current from the ship's electrical system into the direct current required to operate the launchers . Operation is then carried out with 28 V direct current, but can also be carried out in emergency mode over a period of five to eight hours using the built-in batteries with 24 V direct current.

Further development

In the meantime, most of the SRBOC systems have been modified so that they can also use active radar baits of the Nulka type (SRBOC Mk53 DLS ). The modification to the DLS MK 53 Mod 4 is based on the addition of two Nulka launchers to the existing Mk 137 Mod 2 launchers and a new “Decoy Launch Processor”.

In 1994 the US Navy placed an order with Loral Hycor to develop a disposable acoustic decoy for torpedoes , which was to be shot down via the Mk 36.

Decoys

Two starters for SRBOC on the Wisconsin with two ammunition magazines

As decoys can strips of aluminum or coated carbon fibers may be included to missiles with radar to provide a false target (so-called chaff or Chaff), or burning phosphorus , aluminum, magnesium , or combinations (so-called heat torches or flares ) to missiles with infrared seeker a false target to offer.

The Mk 36 uses:

  • Super Chaffstar (Radar)
  • Super Hiram III (infrared)
  • Super Hiram IV (infrared)
  • Super Gemini (radar / infrared)
  • Super LOROC (Long-Range Offboard Chaff) rocket-assisted chaff. The Super LOROC can bring the decoy to a distance of up to 2.5 kilometers from the ship.
  • NATO Seagnat (radar / infrared), in different versions such as Mk 214, Mk 216, Giant Mk 245 (infrared) or TALOS. When using the Mk 214 and Mk 216, the Mk-137 launcher must be cleaned after each shot because heavy combustion residues are left in the launch tubes.
  • NULKA, an active ECM charge with rocket stabilization to extend the flight time (only with modification of the launcher)

Technical specifications

execution Capacity decoys Number of throwers Replacement ammunition Number of ammunition magazines
Mod 1 and 5 12 2 40 2
Mod 2, 6 and 9 24 4th 80 4th
Mod 8 48 8th 160 8th
Mod 10 36 6th 120 6th
Mod 11 24 4th 140 4th
Mod 12 36 6th 210 6th
  • Tube length: 62.23 cm
  • Total height loaded: 152.4 cm
  • Muzzle velocity: 75 m / s
  • Fire control system: Mk-164 bridge control; Mk-158 launch controller (Mod 1, 2 and 8) or AN / SLQ-32 console (Mod 5 and 6)

User

Selection of the navies and ship classes on which the Mk 36 SRBOC is used:

Web links

Commons : Mark 36 Super Rapid Blooming Offboard Chaff  - Collection of Images, Videos and Audio Files

Individual evidence

  1. ↑ a b Global Security with data on the Mk 36 (English) ( Memento from November 14, 2008 in the Internet Archive )
  2. ↑ a b c Information on the Mk36 SRBOC on FAS.org (English) ( Memento from October 1, 2009 in the Internet Archive )
  3. ↑ a b c Mk 36 on MilitaryPeriscope (English)  ( page no longer available , search in web archives )@1@ 2Template: Dead Link / proxy2.militaryperiscope.com
  4. ↑ a b c Forecastinternational.com with description of the SRBOC (English)
  5. ↑ FBO.gov with procurement tender for SRBOC (English) ( Memento from May 20, 2018 in the Internet Archive )
  6. ↑ Information about the SRBOC on the website of the destroyer Mölders ( Memento from May 20, 2018 in the Internet Archive )
  7. ↑ a b c d Data sheet for the Mk 36 on FAS.org (English, PDF file; 35 kB) ( Memento from February 6, 2007 in the Internet Archive )
  8. ↑ Brief information on the SRBOC on Janes.com (English)
  9. ↑ MK-53 Nulka Decoy Launching System (DLS). FAS.org, archived from the original on October 23, 2015 ; accessed on October 13, 2015 .
  10. ↑ Data Sheet Mk 245 ValleyAssociates (English) ( Memento of 20 October 2006 at the Internet Archive )
  11. ^ Website of the British armed forces with data on the Seagnat (English) ( Memento from June 8, 2007 in the Internet Archive )
  12. ↑ Information about the Seagnat in Janes (English)