Mirage 3NG
Following the development of the Mirage 50, Dassault had experimented with yet another derivative of the original Mirage series, named the Mirage 3NG (Nouvelle Génération, next generation). Like the Milan and Mirage 50, the 3NG was powered by the Atar 9K-50 engine. The prototype, a conversion of a Mirage IIIR, flew in December 1982.
The 3NG had a modified delta wing with leading-edge root extensions, plus a pair of fixed canards fitted above and behind the air intakes. The canards provided a degree of turbulent airflow over the wing to make the aircraft more unstable and so more maneuverable.
Avionics were completely modernized, leveraging off the development effort for the next-generation Mirage 2000 fighter. The Mirage 3NG used a fly-by-wire system to allow control over the aircraft's instabilities, and featured an advanced nav/attack system; new multimode radar; and a laser rangefinder system. The uprated engine and aerodynamics gave the Mirage 3NG impressive performance. The type never went into production, but to an extent the 3NG was a demonstrator for various technologies that could be and were featured in upgrades to existing Mirage IIIs and Mirage Vs.
Enhancements derived from the 3NG were incorporated into Brazilian Mirage IIIEs following 1989, as well as into four ex-Armée de l'Air Mirage IIIEs that were transferred to Brazil in 1988. In 1989 Dassault offered a similar upgrade refit of ex-AdA Mirage IIIEs under the designation Mirage IIIEX, featuring canards, a fixed in-flight refueling probe, a longer nose, new avionics, and other refinements.