Franke and Erhard Doppel-Eindecker
A big tandem monoplane glider, weighing 250 kg and with a wing area of 40 sq.m. It was tested at the Pfaffendorfer Weise outside Halle in 1911, towed by a 20 hp automobile. It would take off at a speed of 25 km/h. During a following flight the towing rope broke and the plane crashed to the ground when it lost speed, breaking all upper rigging wires. After the crash it was abandoned because the two young men could not raise enough money to repair it.