page_title: Mitsubishi A6M Zero
section_title: A6M5 Type 0 Model 52
hierarchical_section_title: Mitsubishi A6M Zero / Variants / A6M5 Type 0 Model 52
caption_attribution_description: English: A6M5 Reisen (Zeke-52) 14.jpg
context_page_description: The Mitsubishi A6M "Zero" is a long-range fighter aircraft formerly manufactured by Mitsubishi Aircraft Company, a part of Mitsubishi Heavy Industries, and operated by the Imperial Japanese Navy from 1940 to 1945. The A6M was designated as the Mitsubishi Navy Type 0 carrier fighter, or the Mitsubishi A6M Rei-sen. The A6M was usually referred to by its pilots as the Reisen, "0" being the last digit of the imperial year 2600 when it entered service with the Imperial Navy. The official Allied reporting name was "Zeke", although the name "Zero" was used colloquially by the Allies as well.
  The Zero is considered to have been the most capable carrier-based fighter in the world when it was introduced early in World War II, combining excellent maneuverability and very long range. The Imperial Japanese Navy Air Service also frequently used it as a land-based fighter.
  In early combat operations, the Zero gained a reputation as a dogfighter, achieving an outstanding kill ratio of 12 to 1, but by mid-1942 a combination of new tactics and the introduction of better equipment enabled Allied pilots to engage the Zero on generally equal terms.
context_section_description: Sometimes considered as the most effective variant, the Model 52 was developed to again shorten the wings to increase speed and dispense with the folding wing mechanism. In addition, ailerons, aileron trim tab and flaps were revised. Produced first by Mitsubishi, most Model 52s were made by Nakajima.  The prototype was made in June 1943 by modifying an A6M3 and was first flown in August 1943. The first Model 52 is said in the handling manual to have production number 3904, which apparently refers to the prototype.
  Research by Mr. Bunzo Komine published by Mr. Kenji Miyazaki states that aircraft 3904 through 4103 had the same exhaust system and cowl flaps as on the Model 22. This is partially corroborated by two wrecks researched by Mr. Stan Gajda and Mr. L. G. Halls, production number 4007 and 4043, respectively. (The upper cowling was slightly redesigned from that of the Model 22.)
  An early production A6M5 Zero with non separated exhaust, with an A6M3 Model 22 in the background.
  A new exhaust system provided an increment of thrust by aiming the stacks aft and distributing them around the forward fuselage. The new exhaust system required "notched" cowl flaps and heat shields just aft of the stacks. (Note, however, that the handling manual translation states that the new style of exhaust commenced with number 3904. Whether this is correct, indicates retrofitting intentions, refers to the prototype but not to all subsequent planes, or is in error is not clear.)  From production number 4274, the wing fuel tanks received carbon dioxide fire extinguishers. From number 4354, the radio became the Model 3, aerial Mark 1, and at that point it is said the antenna mast was shortened slightly. Through production number 4550, the lowest exhaust stacks were approximately the same length as those immediately above them. This caused hot exhaust to burn the forward edge of the landing gear doors and heat the tires. Therefore, from number 4551 Mitsubishi began to install shorter bottom stacks. Nakajima manufactured the Model 52 at its Koizumi plant in Gunma Prefecture. The A6M5 had a maximum speed of 565 km/h (351 mph)) at 6,000 m (20,000 ft) and reached that altitude in 7:01 minutes.
  Subsequent variants included:
  A6M5a, Model 52甲 (Kō, 52a) – Starting at Mitsubishi number 4651, an armament change substituted the belt-fed Type 99-2 Mark 4 cannon, with 125 rounds per gun, in place of the drum-fed Type 99-2 Mark 3 cannon that carried 100 rounds per gun. Hence, the bulge in the underside of the wing for each cannon's ammunition drum was deleted and the ejection port for spent cartridge cases was moved. Thicker wing skinning was installed to permit higher diving speeds.
  A6M5b, Model 52乙 (Otsu, 52b) – Armament change: The 7.7 mm (.303 in) Type 97 gun (750 m/s (2,500 ft/s) muzzle velocity and 600 m (2,000 ft) range) in the right forward fuselage was replaced by a 13.2 mm Type 3 Browning-derived gun (790 m/s (2,600 ft/s) muzzle velocity and 900 m (3,000 ft) range, with a rate of fire of 800 rounds per minute) with 240 rounds. The larger weapon required an enlarged opening, creating a distinctive asymmetric appearance to the top of the cowling, and a revised gas outlet near the windscreen. In addition, each wing cannon received a fairing at the wing leading edge. A plate of armored glass 45 mm (1.8 in) thick was fitted to the windscreen. A larger propeller spinner was fitted, suggesting a change to the propeller. The type of ventral drop tank was changed, it now had fins and was suspended on a slanted pipe. The first of this variant was completed in April 1944 and it was produced until October 1944.
  A6M5c, Model 52丙 (Hei, 52c) – Armament change: One 13.2 mm (.51 in) Type 3 machine gun was added in each wing outboard of the cannon, and the 7.7 mm gun on the left side of the cowl was deleted. Four racks for rockets or small bombs were installed outboard of the 13 mm gun in each wing. Engine change: Some sources state that the hei had a Sakae 31 engine In addition, a 55 mm (2.2 in) thick piece of armored glass was installed at the headrest and an 8 m
caption: Mitsubishi A6M5 Model 52s abandoned by the Japanese at the end of the war (Atsugi naval air base) and captured by US forces.
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