The high-speed Japanese dive bomber that was faster than the Zero

Wars & Conflicts · Published 16 October 2026 Swipe more like this →

In short: Designed to replace the aging Aichi D3A, the Yokosuka D4Y Suisei was a remarkably fast, slender monoplane. While its speed made it a lethal threat to Allied carriers, early models lacked the armor and self-sealing fuel tanks necessary to survive intense combat encounters.

The development of the D4Y Suisei began in 1938, heavily influenced by the German Heinkel He 118. While the aircraft promised exceptional performance, its path to combat was marred by technical hurdles. Early flight testing revealed fatal flaws, including wing spar cracks and dangerous wing flutter, which delayed mass production and forced the Imperial Japanese Navy to initially use the D4Y1-C variant for reconnaissance instead of dive bombing. The aircraft's design featured three electrically-actuated dive brakes located ahead of each landing flap. Its slender fuselage was specifically engineered to facilitate high speeds during both level flight and steep dives.

Engine choice significantly altered the aircraft's capabilities. Initial versions, such as the D4Y1 and D4Y2, employed the liquid-cooled Aichi Atsuta V12, which was a licensed copy of Germany's Daimler-Benz DB 601. However, these proved unreliable in front-line service. Later variants, the D4Y3 and D4Y4, transitioned to the air-cooled Mitsubishi MK8P Kinsei 62 radial engine. While this improved reliability and climb rates, the radial engine's higher fuel consumption reduced the aircraft's range and cruising speed. The D4Y1 Kai model was specifically equipped with catapult apparatus to facilitate operations from smaller, compact carriers. This variant was developed to address the difficulties encountered when operating from the IJN's smaller vessels.

Despite these compromises, the Suisei proved devastatingly effective against naval targets. In October 1944, a single D4Y contributed to the sinking of the light carrier USS Princeton. In March 1945, another single D4Y struck the carrier USS Franklin with two bombs, nearly sinking the vessel and causing nearly 800 casualties. The final D4Y4 variant, which finally included armor and bulletproof glass, was even utilized in one of the final kamikaze attacks in 1945. The final D4Y4 special strike version was capable of carrying a single 800 kg bomb. This variant even featured three rocket boosters to assist with terminal acceleration during its final dive.

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