Iran's Saeqeh: A stealthy evolution of American aviation heritage

Wars & Conflicts · Published 17 October 2026 Swipe more like this →

In short: How does a nation modernize its air force while under heavy sanctions? Iran took the American Northrop F-5 and performed a surgical transformation. By tweaking stabilizers and integrating domestic radar, they created the Saeqeh—a fighter that blends legacy hardware with localized innovation.

The HESA Saeqeh (meaning 'Thunderbolt') is not a ground-up design but a sophisticated modification of the American Northrop F-5. While it retains the core fuselage, landing gear, engines, and cockpit instruments of its predecessor, Iran introduced critical aerodynamic changes to enhance performance. The most visible distinction is the addition of two vertical stabilizers instead of one, along with altered jet intakes and additional wing strakes.

The aircraft serves as a bridge between generations of Iranian aviation. Created by both the Ministry of Defence and the Islamic Republic of Iran Air Force, this aircraft succeeded the Azarakhsh fighter. While production eventually shifted to the HESA Kowsar, the Saeqeh-1 and Saeqeh-2 variants were produced in limited numbers—five single-seat and one twin-seat model respectively. These aircraft are powered by two upgraded Iranian-built General Electric J85 afterburning turbojet engines, which incorporate technology from the Pratt & Whitney TF30.

Technologically, the Saeqeh is defined by its 'Baaz' radar system (a Phazotron-NIIR N019). This radar has a range of 80 km and can track up to 10 targets while engaging two simultaneously. Iran also announced an upgraded version in 2015 featuring advanced electronics, avionics, and dual seating for training purposes. By repurposing existing Northrop F-5F airframes—of which approximately 17 were believed to remain in inventory—Iran demonstrated a strategy of 'evolutionary' defense: maximizing the utility of inherited technology through domestic engineering.

This approach highlights a specific military doctrine where limited resources necessitate high-impact modifications. Rather than building entirely new platforms, Iran focused on improving maneuverability and weapon systems within an existing airframe, effectively extending the operational life of 20th-century hardware into the modern era.

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