Chinese Defence Today - HY-4 (C-401) Land-to-Ship Missile

The HaiYing-4 (HY-4, also known as C-401 in its export name; NATO codename: CSS-C-7 Sadsack) is the land-to-ship missile developed from the HY-2. The main improvement of the HY-4 is the replacement of the original liquid-fuel rocket motor on the HY-2 with a turbojet engine, which extends the missile’s range to 150km. The HY-4 is similar to the HY-2 in appearance, but with a slightly shorter and lighter missile body. The missile has an air inlet under the fuselage. Like the later variants of the HY-2, the HY-4 is also fitted with a mono-pulse radar seeker with improved accuracy. An air-launched land-attack cruise missile (LACM) known as XW-41 has been developed on the basis of the HY-4.

Length: 7.36m
Diameter: 0.76m
Wingspan: 2.4m
Weight: 2,000kg
Warhead: 300~500kg time-delayed semi-armour-piercing high-explosive
Propulsion: Two side-mounted ramjet engines; four solid propellant boost motors
Max speed: Mach 0.8
Effective range: 35~135km
Max range: 150km
Flight altitude: Initial 200m; cruise 70m; terminal 8~15m
Guidance: Inertial and terminal active radar
Single-shot hit probability: 70%