JPN - Type 99-2 Model 3 (20 mm kanon)

九九式二〇粍二号機銃三型
Name:
Autocannon Type 99-2 Model 3 Autocannon Type 99 Mark 2 Model 3
Original Title:
Original Name: 九九式二〇粍二号機銃三型
Manufacturer:
Dai Nihon Heiki K. K., Toykawa Naval Arsenal
Period of production:
Production Period:
DD.MM.1942-DD.08.1945
Units produced:
Number of Produced:
?
Prototype Produced:
Prototype Built:
DD.MM.1942
Usage:
Use:
some Mitsubishi A6M3 22 Reisen, Mitsubishi J2M Raiden, Kawanishi N1K Shiden, Nakajima J1N1-Sa Gekko
Specifications:
 Technical Data:
Weight:
Weight:
37.0 kg82 lb
Calibre:
Calibre:
20 mm / 0.79 in
Hub:
Cartridge:
20x101RB
Barrel Length:
Barrel Length:
1054mm3ft 5.5in
Overall Length:
Overall Length: 1885mm4ft 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:
490 rpmRate 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 a drum magazine which held 100 grenades.
It was an improved copy of the Swiss Oerlikon FFL, and was introduced in the Japanese naval aviation for its higher performance.
九式二号機銃 - Kyū-Kyū Shiki Nigō Kizyū, Kanji
The Type 99 Mark 2 was a heavier weapon with a stronger recoil, and was not put in use by the Imperial Japanese Navy before 1942. It was used exclusively in fixed installations in fighters. The Type 99 Mark 2 Model 3 was equipped with a 100-round drum, but the size of the drum was itself a problem in installations in wings of fighters.


The Model 2 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

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