The development began in late 1943 in the IGStelle in Travemünde. The first design consisted of a spherical body with a diameter of about 76 cm and a weight of 400-450 kg. The total length was about 203 cm. Once dropped, it was calculated with a range of ideally 400 meters at a launch height of 20 meters and a speed of 700 km / h. Since the range was far too limited in combat use, a rocket engine consisting of a number of bundled rockets was mounted on the rolling body, which should extend the range to about 4000 meters. After a firing time of 4-5 seconds, the final speed of 330 m / sec. reached and the drive was disconnected. With 320 m / sec. then the bomb should hit its target.To achieve optimum flight stability, three different versions of the "Kurt" or "Prism Roll Bomb" were planned. With a Fw 190 F-8 and allegedly a Me 410 B-5 could still two versions will be tested (About two test drops of a Fw 190 F-8 on the test site Leba / Baltic Sea, there are film sequences, links below.) Until the project in August 1944 was set. After the war documents were brought to the US, but apparently were not of such great interest that would have justified a further development.