Although not yet named as such, the Model A had full span flaperons on the upper wing trailing edge, which combined Frise type ailerons and flaps to allow for both lateral control and good low speed handling without reducing the top speed. Spruce was used for both the spars and the ribs, with duraluminum tubes acting as compression ribs to provide longitudinal rigidity. The rudder and elevators were constructed in a similar manner to the wings, with spruce spars and ribs. Both were covered in doped fabric. The elevators and rudder were interchangeable, while the upper and lower outer wing panels were identical ahead of the rear spar, facilitating production and repair,Haffke, 2004, pp.79 a major consideration given the Granville Brother's prior history of running a mobile aircraft repair facility.Granville, 2006, pp.11 & 13
