"The aim of the research was the use of the machine's abilities into civil aviation. In 1926, the Institute directed the Albatros Berlin-Johannisthal Works, to build the high altitude research aircraft based on the SSW D.IV airframe. The design was worked out by Martin Schrenk. It envisaged the enlargement of the wings to a significant span, its reinforcement with two pairs of struts, changing of the empennage outline and the use of the specially designed, high altitude propeller. After rebuild, the aircraft received the Albatros H-1 marking and bore the 10114 factory number. This aircraft however, never flew, as during the ground tests the wing construction appeared too delicate to ensure a safe flight."
My source was a now defunct site called histaviation.com