The 2K11 Krug (; ) is a
Soviet and now
Russian long range, medium-to-high altitude
surface-to-air missile (SAM) system. "2K11" is its
GRAU designation, while SA-4 "Ganef" is its
NATO reporting name. The
missiles are launched with the aid of four
solid fuel rocket motors inside
boosters attached to the outside of the massive missile. Once they have burned and the missile is aloft, it fires a liquid-fuelled
ramjet sustainer engine. It reaches speeds of up to
Mach 4 and has an effective range of 50-55 km (31-34 miles) depending upon the version. It carries a 135 kg (300 lb) warhead. Possible engagement altitudes range from 100 m-27 km (330-88,500 feet).
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