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The Lippisch P.13b was a follow-on design from the P.13a, and was also a ramjet fighter. Designed in December 1944, it featured Lippisch's favorite wing plan, a delta design (sweepback was 60 degrees) with downturned wingtips. A double fin and rudder was chosen, and the cockpit was moved to a forward position, ahead of the delta wing's apex. On each side of the cockpit on the wing's leading edge were the air intakes which fed the ramjet. Because of the fuel shortage in Germany at this stage in the war, an ingenious plan to use coal (or paraffin coated lignite dust) for fuel was to be tried. A centrally installed round or hexagonal heat-resistant ceramic combustion chamber was fitted in the interior of the wing, and was fillable from above. The main landing gear was a retractable landing skid, and the rear rested on the reinforced downturned wingtips. No armament was planned at this stage, and no tests were ever carried out with this design or with the unique power source.