 A new method of construction was introduced that used spruce planking running the length of the aircraft in place of the formed plywood, and the D.III was adapted using this technique to produce D.IV triplane and D.V biplane, both powered by the D.III's 160 hp Mercedes.The fuselage shell's construction technique for these aircraft resembled a clinker-planked boat hull in appearance when finished, and was named "Klinkerrumpf" (clinker body) construction, and was also patented by the firm.A further adaptation of the D.IV with the 185 hp Benz Bz.