The F.F.2 ‘ombygd’ or ‘Norskbygt’ was a 1916 Maurice Farman MF.11 copy based on the F.F.1 airframe.
The machine gun-armed F.F.3 Hydro of 1918 was a float-fitted Farman biplane development (although it is preserved on wheels).
Kjeller Flyfabrikk FF.2 / FF.3
All Aero 