Oerlikon KCB

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

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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