[1] The D.K.D.4 was a two-seat parasol monoplane with a three part, wooden, two spar, fabric covered wing which was trapezoidal in plan.
The central section was mounted on two outward-leaning pairs of steel cabane struts from the upper fuselage, one to each spar and each outer panel was braced to the lower fuselage longerons with a pair of steel struts to the spars.
There was a large semi-circular cut-out in the central trailing edge to ease cockpit access and enhance the upward field of view.
[1][2] Its fuselage was similar to that of the D.K.D.3, which had a welded steel tube girder structure with wooden frames, stringers and fabric covering, producing an oval cross-section apart from a flat underside.
[1] The D.K.D.4's success in the Contest brought military interest in it as a trainer and an order for twenty-five was provisionally agreed.
It was powered by a 63 kW (85 hp) Cirrus III four cylinder upright air-cooled inline engine mounted exposed.