Kashtan CIWS

Kortik / Kashtan
A Kashtan combat module (missiles absent)
Type	Close-in weapon system
Place of origin	Soviet Union, Russia
Service history
In service	1989–present
Used by	See Operators
Production history
Designer	Developer: KBP (Arkady Shipunov) Fire control system: RATEP
Designed	Late 1970s – ?
Manufacturer	Tulamashzavod, RATEP
Produced	1989-present
Variants	Kortik-M / Kashtan-M
Specifications
Weight	15,500 kg (34,200 lb) (Kashtan) 12,500 kg (27,600 lb) (Kashtan-M)
Height	2,250 mm (89 in) (above deck)
Shell	HEI-Frag, Frag-T, APDS-T
Shell weight	0.39 kg (0.86 lb) (HEIF, FT) 0.30 kg (0.66 lb) (APDS-T)
Caliber	30×165mm AO-18
Barrels	2 × 6 (guns); 2 × 4 launch tubes
Action	Gas-operated rotary cannon
Rate of fire	Kashtan: 9,000 rounds/min (guns) Kashtan-M: 1–2 (salvo) missiles per 3–4 sec 10,000 rounds/min (guns)
Muzzle velocity	860 m/s (2,800 ft/s) (HEIF, FT) Kashtan-M: 960 m/s (3,100 ft/s) (HEIF, FT) 1,100 m/s (3,600 ft/s) (APDS-T)
Effective firing range	By missiles: Kashtan: 1,500–8,000 m (4,900–26,200 ft) Kashtan-M: 1,500–10,000 m (4,900–32,800 ft) By guns: Kashtan: (range, altitude) 500–4,000 m (1,600–13,100 ft), 3,000 m (9,800 ft) Kashtan-M: 300–5,000 m (980–16,400 ft)
Feed system	Link-less, helical; 1000 rounds
Sights	Radar / TV-optical: 2–3/1 m (6.6–9.8/3.3 ft) accuracy, tracks 6 targets simultaneously
Warhead	Continuous-rod w/ frag layer
Main armament	8 × 9M311K + 32 missiles Kashtan-M: 8 × 9M311-1E + 24 missiles
Secondary armament	2 × AO-18K autocannon Kashtan-M: 2 × AO-18KD autocannon
Flight altitude	3,500 m (11,500 ft) (Kashtan) 6,000 m (20,000 ft) (Kashtan-M)
Speed	910 m/s (3,000 ft/s)

The Kashtan (Russian: Каштан, English: Chestnut) close-in weapon system (CIWS) is a modern naval air defence gun-missile system deployed by the Russian Navy.

It is found on the aircraft carrier Admiral Kuznetsov, Kirov class battlecruisers, Neustrashimy class frigates, China's Sovremenny class destroyers, and other modern designs. Most typically deployed as a combined gun and missile system, it provides defence against anti-ship missiles, anti-radar missiles and guided bombs. The system can also be employed against fixed- or rotary-wing aircraft or even surface vessels such as fast attack boats or targets on shore.

The weapon is a modular system consisting of a command module and typically two combat modules, as in the case of China's Eminent and Thoughtful destroyers, although the number can be as many as 8 in the case of Admiral Kuznetsov. The command module detects and tracks threats, distributes targeting data to the combat modules, and interrogates IFF of approaching threats. The command module has a 3-D target detection radar, and an all weather multi-band integrated control system. Depending on the number of installed combat modules, the system can engage multiple targets simultaneously. The combat modules automatically track using either radar, electro-optronic control system (such as FLIRs) or both, and then engages targets with missiles and guns. The combat modules are typically equipped with two GSh-30K (AO-18K) six-barrel 30 mm rotary cannons, fed by a link-less feeding mechanism, and two 9M311 launchers equipped with 4 ready-to-fire missiles each and fed by a reloading system storing 32 missiles in ready-to-launch containers.