Yugoslavia had a long tradition of building its own combat aircraft, from the J-1 Jastreb to the G-2 Galeb, part of a deliberate policy of defence self-sufficiency for a country that stood between the two Cold-War blocs. By the mid-1970s the first-generation G-2 Galeb — a straight-wing jet dating to the early 1960s — and imported T-33s could no longer bridge the gap to modern fast jets such as the MiG-21 and the home-grown J-22 Orao.

SOKO’s response was not a rework of the Galeb but an essentially new aircraft that kept only the famous name. The G-4 introduced a swept wing, a more powerful Viper engine, modern ejection seats and a proper weapons capability, making it usable as both a lead-in fighter trainer and a light attack platform. The result was one of the more capable indigenous trainers of its generation from outside the major aerospace powers.

The Bristol Siddeley (later Rolls-Royce) Viper began life as a British target-drone engine and grew into one of the most widely used trainer turbojets in the world, powering the Jet Provost, Strikemaster, MB-326 and many others. Yugoslavia produced the Viper Mk 632 under licence, giving SOKO a reliable, well-understood powerplant without depending on either Cold-War bloc. The single non-afterburning engine limits the G-4 to high-subsonic speeds — around Mach 0.86 — but delivers the docile handling, low running cost and easy maintenance that a training aircraft is built around.

Like many jet trainers, the Super Galeb was designed from the start to double as a light-attack and counter-insurgency aircraft. Its underwing stations could carry gun pods, rocket launchers and bombs, and the type was used in ground-attack sorties during the Yugoslav wars of the 1990s. Later upgrade proposals — sometimes referred to as the G-4M — aimed to add modern avionics and guided weapons, though these were produced only in very small numbers. As with any light-attack conversion of a trainer, its combat value lay in low cost and availability rather than survivability against modern air defences.

The Super Galeb was a product of the Yugoslav state industry, built for the country’s own air force and never marketed on an open Western dollar market, so a firm flyaway unit price simply does not exist in the public record. The one export deal — a small batch to Myanmar in the 1990s — was not accompanied by reliably published per-aircraft figures. No credible cost-per-flight-hour number exists for the type in open sources either. As a rule of thumb a single-engine subsonic trainer like the G-4 is far cheaper to operate than a supersonic fighter, but any precise dollar figure attached to a Super Galeb should be treated as an estimate rather than a sourced fact.