To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Limbo (weapon)

From Wikipedia, the free encyclopedia

Limbo ASW mortar on HMNZS Taranaki (F148) c1963
A Limbo mortar on HMNZS Taranaki (F148)
TypeAnti-submarine mortar
Place of originUnited Kingdom
Service history
In service1955–1980s
Used byRoyal Navy
Royal Australian Navy
Royal Canadian Navy
Libyan Navy
South African Navy
WarsFalklands War
Production history
DesignerAdmiralty Underwater Weapons Establishment

Shell400 lb depth charge
Calibre12 inches (30 cm)
Effective firing range400 yards (366 m) to 1,000 yards (914 m)
Warhead weight94 kilograms (207 lb)
Proximity and/or time

Type 170 sonar

Limbo, or Anti Submarine Mortar Mark 10 (A/S Mk.10), was the final development of the forward-throwing anti-submarine weapon Squid, designed during the Second World War[1] and was developed by the Admiralty Underwater Weapons Establishment in the 1950s.[2]

Limbo was installed on the quarterdeck of Royal Navy escort ships from 1955 to the mid-1980s, Australian–built  Daring-class destroyer and River-class destroyer escorts. Limbo was widely employed by the Royal Canadian Navy, being incorporated into all destroyer designs from the late 1950s to the early 1970s, including the  St. Laurent,  Restigouche,  Mackenzie,  Annapolis and  Iroquois classes and the Type 12 President Class frigates built for the South African Navy in the 1960s.


Limbo was loaded and fired automatically with the crew under-cover and was stabilised in pitch and roll. The firing distance of the mortars was controlled by opening gas vents; rounds could be fired from 400–1,000 yards (370–910 m). The weapon was linked to the sonar system of the ship, firing on command when the target was in range. The rounds were projected so that they fell in a triangular pattern around the target in any direction around the ship.[3][4]

The weapon was used in the 1982 Falklands War and remained in service in the Royal Navy and Commonwealth navies until the 1990s. A surviving system is preserved at Explosion! Museum of Naval Firepower in Gosport, Hampshire.

Sonar control of the A/S Mortar Mk 10

The firing of the Mortar Mk 10 was controlled by the Type 170 (and later the 502) attack sonar from the Sonar Control Room (SCR), which was generally located next to the operations room in the warship. The 170 sonar had three operators who maintained sonar contact with the target and aimed the weapon in bearing, range and depth. Firing was done by means of a pistol grip and trigger mounted to the deckhead.

General characteristics

  • Total system weight: 35 tons including 51 projectiles (17 salvos).


  1. ^ British ASW weapons
  2. ^ Bogart, Charles H. (2010). "An Anti-submarine Weapon: The Limbo Mk NC 10 Mortar". Warship International. XLVII (4): 359–362. ISSN 0043-0374.
  3. ^ Richardson, Doug (1981). Naval Armament. London; New York: Jane's Publishing. ISBN 0-531-03738-X. OCLC 642104997.
  4. ^ YouTube showing loading and firing
This page was last edited on 23 June 2021, at 05:55
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.