The Aichi B7A "Ryusei", code named "Grace" by the allies, undoubtedly represents a highlight of Japanese aircraft design in World War II. Its design started in 1942 as a carrier-based torpedo and dive-bomber, but at the time when it entered mass production, the Japanese navy no longer had aircraft carriers to launch it from. Therefore, the 105 build planes had to be used from land bases. The Aichi B7A had inverted gull wings like the American Corsair to give clearance for the propeller without requiring the use of long main undercarriage legs. Its flight dynamics were comparable to American planes like the Helldiver. Additionally, it featured self-sealing tanks, unlike most of the other Japanese planes. Its armament of two 20mm cannons and up to 1800 kg of bombs or two torpedoes made it a dangerous opponent, but it was unable to influence the course of war.