Mitsubishi A6M2 Zero

History & service

The Zero got its name from its official designation, Navy Type Zero Carrier-Based Fighter (or Reisen), though the Allies code-named it "Zeke." The Zero was the successor to the A5M Type 96 "Claude." Mitsubishi designed the A6M from Navy requirements set out in 1937 for a fighter that was fast, maneuverable and had great range. Designed as a carrier-borne fighter, it was exceptionally light compared to its opponents.

This requirement was not only necessary to provide maneuverability but also was caused by the Zero's low-powered engine. Lack of interservice cooperation in engine development limited the horsepower available to Japanese designers. Other consequences included omitting armor protection for the pilot, not using self-sealing fuel tanks, and building lightweight wings as an integral part of the fuselage.

The A6M first saw combat in China in the late summer of 1940, and it quickly helped Japan dominate the air in Asia. When Japan attacked Pearl Harbor on Dec. 7, 1941, 125 Zeros from six aircraft carriers participated. In the early part of the war, Allied aircraft such as the Curtiss P-40 and Seversky P-35 were at a disadvantage in a dogfight with a Zero flown by a skilled pilot, and the A6M became a well-known and dangerous opponent.

The Japanese advantage, however, began to disappear as American tactics evolved. American pilots gained experience fighting the Zero in China with the American Volunteer Group, known as the Flying Tigers, and at the Battle of Midway. The key to fighting the Zero was to stay out of dogfights, and instead use superior armament and hit-and-run diving attacks against the relatively fragile A6M.

American fighters introduced in 1943 were more powerful (2,000-hp engines), faster, and had much more firepower than the Zero. As Allied pilots used their heavily-armed aircraft to advantage, the Zero's dominance ended. At the same time, the number of American aircraft and pilots increased, and the number of experienced Japanese aircrew shrank.

While development of the Zero continued by adding self-sealing tanks, armor plate and increasing horsepower to 1,150 hp, the later Zero was much heavier and thus less nimble. Weight increased 28 percent, but horsepower increased only 16 percent, degrading overall combat performance.

Beginning around October 1944 during the battle for the Philippines, Zeros were used in kamikaze attacks. Kamikazes used A6Ms more than any other aircraft for these suicide missions.

American and Australian aircraft sank four Japanese destroyers and 15 troop ships, and shot down more than 50 Zeros, preventing Japanese reinforcements from reaching New Guinea.

The aircraft in figures

Armament: Two 20mm cannon, two 7.7mm machine guns · Engine: Sakae 12 of 940 hp · Maximum speed: 316 mph · Range: 1,930 miles

Performance was only part of the contest

A fighter's speed, climb, range, visibility, and armament shaped what it could do, but those qualities did not act alone. Training, tactics, warning systems, maintenance, fuel, and the condition of the airfield influenced every encounter. The aircraft that looks best in a table might be at a disadvantage at the wrong altitude, carrying the wrong load, or arriving with too little fuel to remain in the fight.

Escort missions demonstrate the importance of purpose. A fighter defending bombers had responsibilities beyond pursuing an opponent. It needed sufficient range, a useful position, and the discipline to remain with the force it protected. Ground attack imposed different demands, including visibility, endurance near the target, and the ability to survive damage from below.

Comparing aircraft across museums is most rewarding when the mission remains in view. An early pursuit biplane, a wartime piston fighter, and a Cold War jet represent different technologies, but all were part of a larger operational system. Personal accounts reveal how pilots worked within those limits. They also show why claims of individual success need context: weather, surprise, teamwork, and opportunities created by others shaped the outcome. The aircraft provides the physical evidence; the surrounding stories explain how people used it and what that use cost.