It had a one-piece wooden wing of trapezoidal plan with an unswept leading edge, built around two spars and fabric covered.

[1] The D.K.D.1 was powered by a 22 kW (30 hp) Haacke HFM-2 air-cooled flat twin engine mounted onto the rectangular section steel tube fuselage frame under single-curvature duralumin sheet, with its cylinder heads exposed for cooling.

[1] Both fin and tailplane, the latter located on top of the fuselage, were small and rectangular in shape, mounting large, balanced control surfaces.

[1] Its undercarriage was fixed and of the tailskid type, with mainwheels with rubber cord shock absorbers on a single axle.

[1] The D.K.D.1 first flew in February 1926, piloted by Muślewski and the early tests led to the raising of the wing noted above and to other changes to the centre-section.

His 300 km (190 mi; 160 nmi), bad weather leg from Toruń to Warsaw has been reported as "the first long cross-country flight to be made on a Polish-designed lightplane".