Fritz Von Opel flies his Opel-Sander RAK 1 rocket propelled air plane. Fritz Von Opel sits in the cockpit of the Opel RAK 1 plane. Repeated trials fail to lift the plane. Finally the plane rises in air. Smoke trailing the Opel RAK 1 plane as it flies. Given the date, this might be a RAK 3, even though the RAK 1 designation is seen on the plane.