Onboard systems comprised of various processors, suites, trackers, directors and engagement units. Sonar was also an appropriate part of the base design. Armament included an SA-N-4 "Gecko" surface-to-air missile series launcher as well as 4 x SS-N-2C Anti-Ship Missile (ASM) launchers. There were 4 x 76.2mm Dual-Purpose (DP) guns set within the two aforementioned turrets and 4 x 30mm guns. The warship was also outfitted with 2 x RBU-6000 series depth charge launchers and held provision for carrying up to twenty naval mines for dispersal in contested seas.
The Koni-class was the NATO reporting name while the group came to be known in the Soviet inventory as "Project 1159". Three distinct construction batches emerged which was led by the Project 1159 "Koni I" series ships made for the nations of Bulgaria, East Germany and Yugoslavia. Then followed Project 1159T "Koni II" which included ships for Algeria and Cuba and Project 1159TR "Koni II" were warships delivered to Libya. The primary difference between the Koni I and Koni II series ships was that the former vessels were designed particularly for European water operation and the latter vessels intended for warm water environments like those found in the Middle East region. There might have been some slight differences in design between the ship groups and countries operating them - leading to some variation on overall dimensions and armament fits.
The Soviet Navy made use of one Koni-class warship (the Delfin) for a time but this was reserved for the training of foreign parties in the details of the new type. The sole example was eventually delivered to Bulgaria during 1990 as the "Brave". Some Koni-class ships continue in service today (2015) but many first-rate navies have decommissioned and scrapped their stocks.
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