The original warhead weighed , intermediate warheads weighed and the latest warhead weighs . All are equipped with a proximity fuse and contact fuse. The missiles themselves weigh between . Missiles are catapulted clear of the launching tubes before their rocket motor fires, and can accelerate at up to 100 "g" (1 km/s²). They launch straight upwards and then tip over towards their target, removing the need to aim the missiles before launch. The missiles are steered with a combination of control fins and through thrust vectoring vanes. The sections below give exact specifications of the radar and missiles in the different S-300 versions. Since the S-300PM most vehicles are interchangeable across variations.