| Name: | Autocannon Type 99-2 Model 5 | Autocannon Type 99 Mark 2 Model 5 | ||
| Original Title: | Original Name: | 九九式二〇粍二号機銃五型 | ||
| Manufacturer: | Dai Nihon Heiki K. K., Toykawa Naval Arsenal | |||
| Period of production: Production Period: | DD.MM.1943-DD.08.1945 | |||
| Units produced: Number of Produced: | ? | |||
| Prototype Produced: Prototype Built: | DD.MM.1943 | |||
| Use: | Use: Mitsubishi A7M Reppu | |||
| Specifications: Technical Data: | ||||
| Weight: | Weight: | 38.5 kg | 85 lb | |
| Calibre: Calibre: | 20 mm / 0.79 in | |||
| Hub: Cartridge: | 20x101RB | |||
| Barrel Length: Barrel Length: | 1054mm | 3ft 5.5in | ||
| Overall Length: | Overall Length: | 1885mm | 4ft 4.39in | |
| Ammunition Used: Ammo Used: | Bullet, Penetrating (142g), Penetrating-Incendiary, Bursting-Incendiary, Bursting-Incendiary, Bursting-Incendiary with tracer, Bursting-Incendiary and Incendiary | Ball, A.P. (5.009oz), A.P./I., T., H.E., H.E./T., H.E./I. I | ||
| Performance: Performance: | ||||
| Maximum Range: Maximum Range: | 0.8 - 1 km | 0.5 - 0.6 mi | ||
| Rate of Fire: Rate of Fire: | 720 rpm | 720 rpm | ||
| Rate of Attack: Muzzle Velocity: | 750 m/s | 1968.5 ft/s | ||
| Note: Note: | 九式二号機銃 - Kyū-Kyū Shiki Nigō Kizyū, Kanji This weapon was produced in parallel with the Type 99-1, and was produced in a fixed stock design. This type used a different type of cartridge, and differed from the Type 99-1 by its long barrel. The weapon had a higher power output due to the higher muzzle velocity, and quite reciprocally, this weapon had a higher recoil. This model carried its ammunition supply in ammunition belts, which held 125-250 grenades. The designers at the Ordnance Factory finally succeeded in increasing the cadence of the gun, the weapon was included in the Navy's armament in May 1945, but apparently was not used in combat. It was an improved copy of the Swiss Oerlikon FFL, and was introduced in the Japanese Naval Air Force because of its higher performance. | 九九式二号機銃 - Kyū-Kyū Shiki Nigō Kizyū, Kanji The Type 99 Mark 2 Model 5 was a heavier weapon with a stronger recoil, and was not put in use by the Imperial Japanese Navy before 1945, being belt-fed with 125 - 250 rounds. This model resulted from attempts to increase the rate of fire. By modifications that included the addition of strong buffer springs, the rate of fire was raised to between 670 and 750 rpm. Although the Type 99 Mark 2 Model 5 was formally adopted only in May 1945 probably was not used in combat. The MK 2 Model 5 was based on the Oerlikon FFL and came into use as airframes became large and strong enough to accommodate the bigger, more powerful gun. | ||
| 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.japaneseammunition.com www.warbirdsresourcegroup.org pwencycl.kgbudge.com http://ww2db.com/weapon.php?q=188 | |||