 The duralumin N-type struts that separated the wings, and attached the upper wing to the fuselage, had a teardrop profile and were reinforced with steel bracing wires.Laced lacquered fabric covered the empennage and wings, except for the roots of the lower wings which were covered in plywood and the leading edges of the wings were skinned in duralumin for the first .Ailerons were fitted only to the upper wing.