 In this form many tests were carried out, including the fitting of a Maxim machine gun, and seaplane trials, it being fitted with a single central float.At this point the F.E.2 was powered by a 70 hp (52 kW) Gnome.In 1913 the F.E.2 design was once more heavily reworked with a new and streamlined nacelle, upper wing panels which extended the span to 42 ft (12.08 m) and a revised tail with a smaller rudder and tailplane lifted to the top longerons.