Kit #AA2001. 1/72 scale. Highly-detailed resin kit with decals. In early 1944, due to Germany's fuel shortage at that stage in the war, Dr. Alexander Lippisch and his design team wanted to experiment with alternative fuel to power his ramjet fighter designs, such as P.13a. They tried "coal" powder and designed a hexagonal/round shaped chamber which was suitable for coal combustion, and was designed to be refilled from top center. However, the size of the fuel chamber required could not fit into the P.13a fuselage. This led to a follow-on design, the P.13b which was started in November 1944. It also featured a Lippisch's favorite delta wing plan design. The cockpit was moved forward for better pilot visibility. The double rudders were chosen to provide steady flight. The main landing gear was the retractable landing skid, and the rear of the aircraft rested on the reinforced wingtips. No actual craft was built as arrival of the end of the war kept the design to only the concept sketch stage.