At the end of June 1931, he himself then acquired the motor sailer "MARIA" which he named after his wife. The ship had been built in 1927 at the shipyard Gebr. Van Diepen and in 1928 had received a 70 hp Bolnes hot bulb engine.

"MARIA" frequently sailed from the Ruhr region and from the Rhine to Berlin, Pillaw, Königsberg (Kaliningrad), and Tilsit. Crop was frequently transported to Berlin, where the journey went via the Elbe and the Havel when the water level was good, otherwise via Szczecin and the Finow Canal. The cargo for Königsberg (Kaliningrad) was on the outward journey coal briquettes from Wessling on the Rhine and on the return journey sacks of flour that had to be stowed by the crew itself.

Master Heinrich Jüngerhans (born 1865), as forefather of today’s "Jüngerhans Shipping Group", on July 2nd 1879 began his sailor training as a 14-year-old on the sailing vessel of his father.

He gained further experience on the sailing vessels "MARIA REGINA" and "VIRGO MARIA" of his uncles Heinrich Rudolph and Rudolf Jüngerhans. He then also sailed on the sailing vessel "HERMANNUS" of his brother Hermann.