The Allies'
main opponent in the Pacific air war, the Zero is the most
famous symbol of Japanese air power during World War II. The
fighter first flew in April 1939, and Mitsubishi, Nakajima,
Hitachi and the Japanese navy produced 10,815 Zeros from
1940-1945. Zeros were produced in greater number than any
other aircraft. Its distinctive design and historical impact
make the Zero an important machine in air power history.
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.
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