sentences:  Except for a broader chord tail-fin introduced after the first production series, while retaining the original rudder of the Model 2, the Model 7 was superficially identical to its earlier predecessor.A variety of equipment could be fitted to the Canadian variant including optional wheel brakes, a tail skid or tail wheel arrangement, a fuselage belly tank and a fixed cockpit enclosure or "coupe top" with hinged sides.During the late 1930s, a sliding cockpit enclosure became standard equipment of all RCAF Fawns.