C-201 / HY-4 / CSS-C-7 / SADSACK
The HY-4 variant of the C-201 is a mid-range ground-, air-, and ship-launched cruise missile. Little is known of the development of this missile which is a derivative of the HY-1 family, using a turbo-jet. Development of the C-201 HY-4 is believed to have started in the early to 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. The missile is believed to have entered service about 1985. Ship and coastal defense versions are believed to exist and an air-launched version is also believed to have been developed but not to have entered service. At a defense exhibition in Beijing during November 1988 an export version, C-201, was displayed.
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 variant, with two delta wings and triform rudder and tail. The configuration of this missile is similar to that of the 'Styx' and SY-1/HY-1 families with delta wings and triple tail surfaces. However, there is a large ventral scoop air inlet on the centerline of the fuselage for the turbo-jet engine. The missile is launched with the aid of a 300 kg solid-propellant booster attached to the rear underside of the fuselage.
The missile uses an autopilot for mid-course guidance and a J-band (10-20 GHz) monopulse active radar seeker for the terminal phase. A radio altimeter allows the cruise height to be adjusted between 70 and 200 m and the terminal phase involves a high angle dive attack. It is equipped with a 500 kg warhead, which is probably semi-armour-piercing.
An improved version of the HY-4, known as the XW-41 is, has been in development, though some reports suggest that the improved XW-41 is no longer in development. This missile is said to feature a 300km range with GPS guidance. The Chinese HY- 4 anti-ship cruise missile currently employs a relatively inefficient WP- 11 turbojet engine. Its physical size (7. 36 m overall length, 0. 76 m body diameter) would provide space for adding fuel, changing engines, rearranging avionics, replacing existing guidance subsystems, or modifying payloads. In addition, structural modification can be made by adding bulkheads or partitions between compartments and adding simple shaped plates to increase the missile's length slightly.
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