This was solved by a redesign of the wing cellule to extend its span. It shared the BH-6's unusual wing cellule design. The aircraft was an open-framework machine with a three-bay, equal-span, unstaggered wing cellule. Unlike the earlier aircraft, the D.XII used a two-bay wing cellule. The wing cellule was also redesigned compared to the earlier D.XVs. The C.IV had a single-bay wing cellule and was powered by a Benz Bz. A wing cellule was extended by adding an extra half-bay into it.