| Name: | Autocannon Type 99-1 Model 3 | Autocannon Type 99 Mark 1 Model 3 | ||
| Original Title: | Original Name: | 九九式二〇粍一号機銃三型 | ||
| Manufacturer: | Dai Nihon Heiki K. K., Toykawa Naval Arsenal | |||
| Period of production: Production Period: | DD.MM.1940-DD.08.1945 | |||
| Units produced: Number of Produced: | ? | |||
| Prototype Produced: Prototype Built: | DD.MM.1937 | |||
| Use: Use: | Mitsubishi A6M3 32 Hamp and probably Mitsubishi A6M2-N Rufe | |||
| Specifications: | Technical Data: | |||
| Weight: | Weight: | 23.2 kg | 51 lb | |
| Gauge: Calibre: | 20 mm / 0.79 in | |||
| Hub: Cartridge: | 20x72RB | |||
| Barrel Length: Barrel Length: | 800mm | 2ft 7.5in | ||
| Overall Length: | Overall Length: | 1331mm | 4ft 4.39in | |
| Ammunition Used: Ammo Used: | Bullet (124g), Armor Piercing (129g) Armor Piercing Incendiary, Tracer, Tearing, Tearing with Tracer, Tearing Incendiary and Incendiary | Ball, AP (4.5 oz), API, T, HE, HET, HEI, I | ||
| Performance: Performance: | ||||
| Maximum Range: Maximum Range: | 0.8 - 1 km | 0.5 - 0.6 mi | ||
| Rate of Fire: Rate of Fire: | 520 rpm | 520 rpm | ||
| Rate of Attack: Muzzle Velocity: | 600 m/s | 1968.5 ft/s | ||
| Note: Note: | 九式一号機銃 - Kyū-Kyū Shiki Ichigō Kizjū, Kanji - 20mm gun type 99-1 This gun was produced in a fixed magazine design to eliminate the shortcoming of the previous model, which was a drum magazine for 60 grenades, such an ammunition supply devalued the otherwise excellent Zero, so a large drum magazine with a 100 grenade supply was newly used. The deficiency was eliminated, but another one arose - the size of the drum was already a problem when fitted into the wing of the fighter. It was an improved copy of the Swiss Oerlikon FF-F. | Kyū-Kyū Shiki Ichigō Kizyū, Kanji: 九式一号機銃 The Navy cannon Type 99-1 Model 3 was adopted by the Japanese Navy for fixed installation, for fighter aircraft, this gun fed by a 100-round drum magazine but the size of the drum was itself a problem in fighter installations, although the Model 3 guns were installed on the initial production versions of the A6M3 32 Hamp. It was a copy of the Swiss Oerlikon FF-F cannon. | ||
| Sources: | René J. Francillon Ph.D., Japanese Aircraft of the Pacific War, Naval Institute Press, Annapolis Maryland, Reprinted 1990, ISBN-0-87021-313-X www.lonesentry.com users.telenet.be www.warbirdsresourcegroup.org pwencycl.kgbudge.com http://ww2db.com/weapon.php?q=188 | |||
