Junkers Ju 252
The Junkers Ju 252 was designed in 1939 intending it would be a replacement for the Junkers Ju 52.
It was similar with the three motors, but the rest was a new design. The Ju 252 was larger, faster, and could carry a larger load. It was constructed from metal but did not have the corrugated skin like the Ju 52.
The Ju 252 had a ventral loading hatch.
Junkers Ju 352
The Junkers Ju 352 Herkules was made from wood and steel tube construction to save on strategic materials. The Ju 352 was covered in fabric.
The BMW Bramo 323 engines were selected as they had a lower production priority. The BMWs would have 1,200 HP at takeoff with water-methanol boost.