A 9M33M3 missile which is normally encased in a ribbed launch container.
Source: Ajvol - © public domain
The 9M33 missile is a surface to air missile of Soviet origin. It was developed in the 1960's for land based and naval use. It was adopted in both roles in 1972. The 9M33 missiles were highly capable upon introduction, but today are deemed as some of the less capable point defense systems in active service.
The missiles used in the Osa system feature a conventional layout. Most of the missile is made up of the dual thrust solid rocket motor. The booster provides initial velocity and the sustainer maintains that speed. The HE-fragmentation warhead is located at the front. There are four large control vanes at the rear and four smaller ones at the front.
The 9M33 missiles use radar command guidance. This makes them practically invulnerable to flares. Over time resistance to jamming was improved. The 9M33 missiles feature a proximity fuse. Some sources mention an impact fuse in addition. The 9M33M1 and M2 feature an improved fuse with 27 meter range, opposed to 9 meter earlier. The 9M33M3 makes this fuse less susceptible to ground clutter, lowering minimum engagement altitude to 25 meters.
The 9M33 missile was introduced on the land based 9K33 Osa in 1972. In the same year the naval M-4 Osa-M was introduced, using the 9M33M missile. From 1975 onward the 9M33M2 missile and its ribbed launch container were introduced in the 9K33M2 Osa-AK, with six missiles to launch. This was supplemented by the 9M33M3 since 1980.
Romanian Osa system launching a 9M33M2 or M3 missile.
Source: www.defense.ro - © GNU Attribution - Share Alike license
The 9M33 series of missiles was developed for the land based self-propelled 9K33 Osa.
The M2 and M3 variants of the 9M33 are used in improved versions of this land bases system.
The 9M33M missile is used by the Osa-M naval surface to air missile system.
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