The Japanese were also looking for new designs, notably those using inline engines, where they had little experience and purchased the three D-0s for 1.2 million RM, as well as a license for production and a set of jigs for another 1.6 million RM. The three D-0s arrived in Japan in May 1940 and were re-assembled at Kasumigaura. They were then delivered to the Japanese Naval Air Force where they were renamed AXHei, for "Experimental Heinkel Fighter". When referring to the German design, the aircraft is called both the He 100 and He 113, with at least one set of plans bearing the latter name.