Kh-55 (missile Family) - Variants

Variants

• Kh-55 (NATO 'Kent-A', RKV-500A, Izdeliye 120) - original model with 2,500 km range.
• Kh-55-OK - development name of Kh-55SM
• Kh-55SM (NATO 'Kent-B', RKV-500B, Izdeliye 121) - with TERCOM (Terrain Contour Matching) navigation and extra fuel tanks to extend range to 3000 km.
• Kh-101/102 (Izdeliye 111) - developed as a more stealthy replacement for the Kh-55SM in the late 1980s, the Kh-101 has a conventional warhead and the Kh-102 is nuclear. A propfan version with 5000 km range was cancelled in 2000. Accuracy is reportedly 6–9 m.
• Kh-65SE - tactical version announced in 1992 with 410 kg conventional warhead and restricted to the 600 km range limit of the INF treaty.
• Kh-SD (средней дальности Srednei Dalnosti - 'Medium Range') - 300 km range conventional version announced in 1995, possibly for export. Shared components with the Kh-101, range reportedly increased to 600 km with a high-altitude approach, but the Kh-SD was apparently shelved in 2001. An alternative active radar seeker was proposed for anti-shipping use.
• Kh-555 (NATO 'Kent-C', Kh-55SE, Kh-55Sh) - conventionally armed version with an improved guidance system and warhead developed in response to the lessons of the NATO air offensive against Yugoslavia in 1999. It became operational in 2000.

It was believed originally that the RK-55 (SSC-X-4 'Slingshot' and SS-N-21 'Sampson') were land- and submarine-launched derivatives of the Kh-55, but it is now known that the Kh-55 is different from the other two as its motor drops down below the missile during flight.