After carrying out the test programme of the M1, he bailed out and the machine crashed into the ground. It was found that the towing cable, and in the case of the M3, the undercarriage interfered with the flight characteristics of the gliders and consequently the results were difficult to interpret. To clear any lingering doubts about the Natter in the glider mode, Hans Zübert made a daring free flight in the M8 on 14 February, and showed that the Natter was indeed a very good flying machine.