page_title: Silkworm (missile)
section_title: HY-1
hierarchical_section_title: Silkworm (missile) / HY-series / HY-1
caption_attribution_description: English: HY-1
context_page_description: The Shang You or SY-series, and the Hai Ying or HY-series were early Chinese anti-ship cruise missiles. They were derived from the Soviet P-15 Termit missile.
  The HY-1 and HY-2 received the NATO reporting name Silkworm. However, to confuse matters, Western media also referred to the SY-series, and its export derivatives, the Fei Long or FL-series, as Silkworms.
  While it is not a particularly sophisticated missile when compared to newer generations of anti-ship missiles such as the French Exocet or Russian Kh-15 and P-800 Oniks, the Silkworm's unusually large warhead ensures that a single hit will inflict very serious damage.
context_section_description: The HY-1 received two separate NATO reporting name, the CSS-N-2 Safflower for the ship to ship version and the CSSC-2 Silkworm for the land based coastal defense variant.
  The HY-1J was intended for use on the Type 051 destroyers. However, the turmoil of the Cultural Revolution prolonged development into the 1980s. As a result, the Type 051s deployed into the Pacific Ocean to support ballistic missile tests without anti-ship missiles.
  Variants
  HY-1: Basic developmental version developed from the SY missiles, used only in very small numbers as land-to-ship missile for evaluation purposes. Did not enter series production and was replaced by HY-1J.
  HY-1J: Ship-to-ship variant for Type 051 DDG
  HY-1JA: Improved ship-to-ship variant with a new radar seeker for better anti-jamming capability and accuracy
  HY-1A: Land-to-ship variant based on the HY-1JA
  HY-1B: Low level target drone for the test of HQ-2A SAM
  HJ-1YB Target drone for the test of HQ-61 SAM
  Specifications
  Length: 6.60 metre
  Diameter: 0.76 metre
  Wingspan: 2.4 metre
  Weight: 2,300 kg
  Warhead: 513 kg shaped charge high explosive
  Propulsion: One liquid rocket engine and one solid rocket booster
  Speed: Mach 0.8
  Range: 85 km 
  Cruising altitude: 100~300m (early models); <20m (later models)
  Guidance: Inertial + active conical scanning terminal guidance radar (early models); or inertial + monopulse active radar (later models)
  Single-shot kill probability: 70%
caption: HY-1 launch vehicle in the Beijing Military Museum.
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