|FIGHTER||Virtual Aircraft Museum / USSR / Russia / Mikoyan/Gurevich|
Despite termination of trials in 1951 with the SU derivative of the MiG-15 featuring paired 23mm cannon on articulated mountings, the basic concept of gun armament capable of elevation and depression for air-air use was persisted with by the MiG OKB. In 1953, flight testing of a more sophisticated development of the concept began as Izdeliye SN. A variation of the MiG-17, the SN was the first fighter of MiG design to feature lateral air intakes, the 2900kg VK-1A turbojet being fed via circular orifices against concave fuselage sides forward of the wing roots. This arrangement permitted installation of the so-called SV-25 armament system consisting of a trio of 23mm TKB-495 cannon mounted asymmetrically (one to port and two to starboard) on an articulated mounting in the nose section. Operated electrically, the cannon could be elevated to 27° 26' and depressed to 9° 48', the complete SV-25 system weighing 469kg. Trials with the SN were discontinued owing to aiming complexities combined with advances in air-to-air missiles.