S-125 SA-3 GOA
The S-125 SA-3 GOA medium altitude surface-to-air missile system uses a two-stage, solid-fuel missile built by the Isayev OKB. The S-125 missile includes a large 2.6 second burn-time solid propellant booster with rectangular fins that rotate through 90?at launch. The smaller main stage has an 18.7 second burn-time solid propellant sustainer motor, and has four aft fixed fins and four forward movable control. Following booster jettison the missile is tracked by the system's radar with guidance signals sent to an antenna on the rear fins.

US intelligence imagery at Kapustin Yar in late 1959 revealed two probable R&D sites, each of which consisted of four launch pads. A possible launcher on one of the pads held two missile-like objects about 20 feet long. US intelligence subsequntly identified more than 35 sites of this type in the USSR between late 1961 and 1964, usually near SA-1 or SA-2 sites. The initial SA-3A GOA Mod 0, deployed in 1961, includes command guidance throughout the missile's flight. The subsequent SA-3B GOA Mod 1, first deployed in 1964, incorporated an improved guidance system. The missile's ability to dive allows it to be used against surface targets and naval vessels.

Specifications
DOI 1961
Status Standard
Length (m) 6.70
Diameter (m) .60
Weight at launch (kg) 400
Propulsion system
Booster Solid
Sustainer Solid
Launch rails/tubes 2 or 4 rails, ground mounted (not mobile)
Guidance Command, (poss. IR terminal homing)
Warhead (type) HE
Kill Radius 12.5 m
Max. velocity (Mach) 3+
Max. altitude (m) 25,000
Min altitude (m) 100
Operational range (km) 25
Minimum range (km) 6
Reload time (min) 50
Associated radars FLAT FACE, LOW BLOW, SQUAT EYE