Oerlikon KCB

HS.661

Type| Autocannon
Specifications
Mass| 138 kg
Barrel length| 75 caliber

* * *

Cartridge| 30×170mm
Calibre| 30mm
Barrels| 1
Action| Gas-operated
Rate of fire| 600 round/min
Muzzle velocity| 1,080 m/s (3,500 ft/s)
Effective firing range| 3,000 m

The KCB is a 30 mm caliber autocannon, developed by Hispano-Suiza as HS.831.[1] When Oerlikon purchased Hispano's armaments division,[when?] the gun became KCB.[1]

## Development

HS.831 is a scaled-up version of the 20 mm HS.820 and has much the same general operating principles.[1] It uses the 30x170mm round that was developed for this gun.[2] On ground, the HS.820 was used in combination with the HS.661, a single simple anti-aircraft gun mount,[3] and was also mounted on the AMX-13 DCA (Défense Contre Avions), a self-propelled anti-aircraft weapon for the French Army.[4]

In the United Kingdom, BMARC developed A32, a locally operated naval mounting incorporating two HS.831.[1] When the gun was renamed KCB, the A32 became GCM-A series.[1] And LSE (Laurence, Scott & Electricmotors Ltd; presently MSI Defence Systems) also developed a single mount for KCB, which became DS30B.[1] Both GCM-A and DS30B were introduced by the Royal Navy.[1]

The United States Navy designated the twin HS.831 weapons system developed by Emerson Electric as EX-74.[5] This mount was commercialized as the Emerlec 30 and appreciated[clarification needed] by foreign navies.[5]

* HS.661 on display at GADA 601 barracks

* AMX-13 DCA on display at Musée des Blindés

* GCM-A on board HMS Battleaxe

* DS-30B on board HMS Blyth

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Friedman 1997, pp. 459-460.
2. ↑ "30mm Rarden". https://weaponsystems.net/system/355-30mm+Rarden.
3. ↑ Cullen & Foss 1992, p. 201.
4. ↑ Cullen & Foss 1992, pp. 63-65.
5. ↑ 5.0 5.1 Friedman 1997, p. 464.

### Books

* Cullen, Tony; Foss, C.F. (1992), Jane's Land-Based Air Defence 1992-93 (5th ed.), Jane's Information Group, ISBN 978-0710609793
* Friedman, Norman (1997), The Naval Institute Guide to World Naval Weapon Systems 1997-1998, Naval Institute Press, ISBN 978-1557502681

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