UR-100K

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The UR-100K (GRAU index 15A20 and 8K84K) is a variant of the UR-100 intercontinental ballistic missile (ICBM) developed by the Soviet Union. It was known during the Cold War by the NATO reporting name SS-11 Mod 3 Sego and was an improved version of the earlier UR-100.

Here are some of the key features and details about the UR-100K:

• Development and Deployment: Development began in the mid-1960s. Flight tests were carried from 1971 to 1974. The UR-100K was adopted into service in 1971.
• Improvements: The UR-100K featured improvements over the original UR-100, including:
• Increased range and payload mass.
• The ability to carry multiple warheads. It was capable of delivering three separate (but not independently targeted) reentry vehicles.
• Improved accuracy.
• Improved propulsion systems for better service life and reliability.
• A remotely selected flight task from the command post for firing and enter data into the onboard devices.
• Reduced the time of technical readiness of the rocket for launch due to acceleration mode of gyro blocks.
• Warheads: The UR-100K could carry three multiple reentry vehicles (MRVs) with a yield of 350 kilotons each. The reentry vehicles would separate and land in a triangular pattern around the target. It had a CEP (circular error probable) of 1.09 km.
• Propellants: It used storable liquid propellants, specifically asymmetrical dimethylhydrazine (UDMH) as fuel and nitrogen tetroxide as an oxidizer.
• Design: The design featured an elongated first-stage tank compartment compared to the original UR-100.
• Replacement: The UR-100 series was eventually replaced by modernized versions, such as the UR-100K and UR-100U.

The UR-100 family of missiles was developed by Vladimir Chelomei's design bureau. It was the most numerous ICBM deployed in the Soviet Union during the Cold War.