The differences on the F model wings from earlier: The entire wing was redesigned, the most obvious change being the new quasi-elliptical wingtips, and the slight reduction of the aerodynamic area to 16.05 m² (172.76 ft²). Other features of the redesigned wings included new
leading edge slats, which were slightly shorter but had a slightly increased
chord; and new rounded, removable wingtips which changed the planview of the wings and increased the span slightly over that of the E-series.
Frise-type ailerons replaced the plain ailerons of the previous models.