The HY-4 variant of the C-201 is a mid-range ground-, air-, and ship-launched cruise missile. Development of the C-201 HY-4 is believed to have started in the mid-1970s, replacing the C-201 HY-2 liquid propellant sustainer motor with a small turbojet engine, and adding a the monopulse active radar seeker. Apart fromt the substitution of the turbojet engine, the overall configuration of the HY-4 variant of the C-201 missile is similar to the HY-2 variants of the C-201, with two delta wings and triform rudder and tail. The missile has a radio altimeter which allows the cruise height to be varied between 70 and 200 m altitude, followed by a steep dive onto the target. Reports suggest that an improved version of the HY-4, known as XW-41 is no in development. An improved version of the HY-4, known as the XW-41 is, in development. This missile is said to feature a 300km range with GPS guidance.
Contractor CHETA - China Hai Yang [Sea Eagle] Electro-Mechanical Technology - CASC 3rd Academy Entered Service Total length 7.36 m Diameter 0.76 m Wingspan 2.4 m Weight 1740 kg Warhead Weight 500 kg Propulsion one turbojet engine and
one solid rocket booster
Maximum Speed Maximum effective range [HY-4 up to 150km] Guidance mode autocontrol + homing Single-shot hit probability > 70%