Wikipedia

4.5-inch Mark 8 naval gun

The4.5 inch Mark 8is a Britishnaval gunsystem which currently equips the Royal Navy's destroyers and frigates, and some British destroyers and frigates sold to other countries.

4.5-inch Mark 8 naval gun
4.5-inch Mk 8 Mod 1 naval gun onHMSDefender.The multi-faceted gunhouse is designed to reduceradar cross section.
TypeNaval gun
Place of originUnited Kingdom
Service history
In service1972–present
WarsFalklands War
Invasion of Iraq 2003
2011 military intervention in Libya
Production history
DesignerMod 0:Royal Armament Research and Development Establishment
Mod 1:Royal OrdnanceDefence
VariantsMod 0, Mod 1
Specifications
Barrellength244.75 inches (6.217 m) bore (55calibres)
Shell113 x 700mmR
Fixed QF46 pounds (21 kg) HE
Calibre4.45-inch (113 mm)[1]
Rate of fire25 rounds per minute automatic
Maximum firing range27.5 kilometres (17.1 mi)[2]

Background

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Guns with a 4.5 inchcalibrehave been the standard medium-calibre gun of theRoyal Navyfor use against surface,aircraftandshoretargets since 1938. The current 55-calibre Mark 8 gun replaced theWorld War IIera 45-calibreQF 4.5-inch Mk I – V naval guns.Like all British 4.5 inch naval guns, it has a calibre of 4.45 inches (113 mm).[1]

Design

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A new type of 4.5 inch gun with a longer 55-calibrebarrel, it was designed in the 1960s for the Royal Navy's new classes of frigates and destroyers. The weapon, built byVickers LtdArmament Division, was developed by theRoyal Armament Research and Development Establishmentusing the Ordnance, QF 105 mm L13 of theAbbot self-propelled gunas a starting point (it used electrical primers). The outer shell of the gunhouse is built fromglass-reinforced plastic(GRP).

The new weapon emphasised reliability and rapid response to fire first round from shutdown state (particularly for defence against missiles) over a high rate of fire, allowing a switch to a lighter, single barrel mounting and ammunition of a one-piece design.[3]

The gun system has a combination of electrical and hydraulic components and the full system penetrates up to three deck levels below the weather deck; deep magazine, gun control room and power room, gunbay and the gunhouse.

The weapon is semi-automatic and can be operated by a smaller crew than its predecessors. With no personnel in the gunhouse, loading is supported by personnel in the gunbay to load the feed ring and in the deep magazine to pass ammunition to the gunbay. The captain of the gun in the control room ensures weapon readiness and the gun controller in the operations room aims and fires the weapon. The gun has a rate of fire of about 25 rounds per minute and a range of 12 nmi (14 mi; 22 km) with the newer High Explosive Extended Range round.

The first recipient of the new gun and mount, the Mark 8, was the Iranian frigateZaalin 1971. The gun entered Royal Navy service in 1973 on the new destroyerBristol.[4]

These guns proved to be less reliable than the older 4.5 inch Mark V gun (renamed Mark 6 gun mounting) during theFalklands War,being forced to cease fire on several occasions due to faults.[3]

The first major modification to the mounting, the Mod 1, was developed in 1998 in two tranches replacing the gunhouse with a reduced radar cross section assembly and replacing the hydraulic loading mechanism with an all-electric system. This particular gun has been nicknamed the "Krytengun "by members of Royal Navy, after the odd shaped head of a robot from the British Sci-fi comedy seriesRed Dwarf.[4][5][6]Babcock upgraded 13 guns to Mod 1 standard between 2005 and 2012.[7]

The guns are capable of operating in a fire support role against land or sea targets but according toNavy Lookout,softwarefor the system is insufficient to support anti-aircraft missions.[8]However, according to Alex Walters ofForces.net,it may be possible to use the 4.5-inch Mark 8 as an air defence weapon.[9]

Ammunition

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HE ER:

  • Weight of complete round - 80.5 lbs. (36.5 kg)
  • Length of complete round - 48.7 in (123.8 cm)
  • Projectile weight - 45.4 lbs. (20.6 kg)
  • Bursting charge - 6.6 lbs. (3 kg) RDX/TNT (60/40)
  • Propellant charge - 15.8 lbs. (7.15 kg)
  • Muzzle velocity - 2,850 fps (869 m/s)
  • Cartridge case - Brass, 114 x 700 mm R

HE N4A1:

  • Weight of complete round - 80.5 lbs. (36.5 kg)
  • Length of complete round - 48.7 in (123.8 cm)
  • Projectile weight - 46 lbs. (20.9 kg)
  • Bursting charge - N/A
  • Propellant charge - 15.8 lbs. (7.15 kg)
  • Muzzle velocity - 2,850 fps (869 m/s)
  • Cartridge case - Brass, 114 x 700 mm R[3]

155 mm variant

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TheMinistry of Defenceinvestigated a proposal fromBAE Systemsto adapt the 4.5 inch system to accept the heavier calibre155 mm(6.1 inch) gun barrel and breech from theAS-90self-propelled gun.[10]This "155mm Third Generation Maritime Fire Support" (155 TMF) would introduce a common gun calibre for theBritish Armyand Royal Navy, helping with ammunition logistics, and encouraging joint Army-Navy development of extended range and precision guided shells.[11]A £4m contract was awarded to develop a prototype, and firing trials were scheduled for 2009[12]with delivery in 2014,[4]but the project was cancelled in the cuts implemented following the2010 Strategic Defence and Security Review.

Operational history

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The Mk 8 was used in theFalklands Warfor naval gunfire support. The Type 21 frigateHMS Alacrityused her Mk 8 to sink the Argentine transportARA Isla de los Estados.[13]In 2011,HMSIron Dukeused its Mk 8 gun to destroy a gun battery outside of the besieged town ofMisrata,Libya,whileLiverpoolused its Mk 8 gun to destroy a shore battery that had fired missiles at her.[14][15][16][17]

Replacement

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Although the Mk 8 was fitted to theType 45 destroyer,on theType 26 frigateit will be supplanted by the BAE5-inch Mk 45 naval gun.[18]

Deployment

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Current

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Historical

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See also

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Weapons of comparable role, performance and era

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References

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Notes

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  1. ^abJane's Ammunition Handbook, 1999–2000 Edition.http:// janes /
  2. ^HMS Collingwood takes delivery of Gate Guard
  3. ^abc"4.5" /55 (11.4 cm) QF Mark 8 Mod 0 and Mod 1 ".NavWeaps.Retrieved1 August2022.
  4. ^abcMcClure, Robert."155 Third Generation Maritime Fire Support (155 TMF)"(PDF).BAE Systems Global Combat Systems. Archived fromthe original(PDF)on 19 July 2013.Retrieved25 September2012.
  5. ^Photo Gallery: HMS Richmond: Type 23 Frigates: Surface Fleet: Operations and Support: Royal Navy
  6. ^"Navy News – News Desk – News – From South Wales to the West Indies".Archived fromthe originalon 21 February 2004.Retrieved17 April2008.
  7. ^"Gun contract completes"(PDF).DESider.Ministry of Defence. September 2012. p. 10.
  8. ^"After action report – Royal Navy's busiest air defence activity since 1982".Navy Lookout.12 January 2024.Retrieved13 January2024.
  9. ^Walters, Alex (10 January 2024)."HMS Diamond: Capabilities of the Type 45 destroyer thwarting red sea attacks".Forces.net.Retrieved14 January2024.
  10. ^155MM Study Looks To Pack More Punch into The Royal Navy's FleetArchived12 February 2012 at theWayback MachineBAe Systems Press release, 14 December 2007
  11. ^Army to get new precision "search and destroy" anti-armour weaponArchived11 December 2007 at theWayback MachineMoD Press release, 20 November 2007
  12. ^"Royal Navy Prepares to Roll out the Big Guns".Royal Navy. 28 August 2008. Archived fromthe originalon 15 October 2008.Retrieved28 August2008.
  13. ^Mayorga, Horacio A.:No Vencidos.Ed. Planeta, Buenos Aires, 1998, page 320.ISBN950-742-976-X(in Spanish)
  14. ^"UK: HMS Iron Duke, HMS Richmond Return to Portsmouth".worldmaritimenews.29 July 2011.Retrieved14 March2020.
  15. ^"HMS Iron Duke honoured for efficiency on operations".gov.uk.7 March 2012.Retrieved14 March2020.
  16. ^"HMS Liverpool fires on Gaddafi forces".gov.uk.13 May 2011.Retrieved14 March2020.
  17. ^Harding, Thomas (4 August 2011)."Libya: Royal Navy warship HMS Liverpool comes under heavy fire".TheGuardian.Retrieved14 March2020.
  18. ^"£183 million deal signed for Type 26 Frigate gun",UK Defence Journal, 28 July 2016

Bibliography

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