Firethorn F-100/Gyron is a long-lived supersonic high-altitude interceptor aircraft that formed the backbone of Nordenfeld air defense for more than 50 years after it's entry to service on early 800's.

The Gyron started it's life as a continuation of Firethorn Aviation's supersonic interceptor study in late 793, by 795 the project was split into what would be the Cormorant SM prototype and a much more ambitious aircraft designed around two massive Imperial Motors JT203 afterburning turbojet engines, which eventually evolved into Gyron prototype.

This notes cover Gyron F.II, the first operational variant used until superseeded by Gyron F.V in late 820's. A total of 136 F.II were built from 806 to 807, most were stationed along Nordenfeld northern and western border.