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Type 99 81mm


Infantry Field Mortar


Imperial Japan | 1939



"The Type 99 of 1939 was an infantry-level field mortar for Japanese ground forces in World War 2."



Authored By: Staff Writer | Last Edited: 01/23/2017 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
As with other participants of World War 2 (1939-1945), the Imperial Japanese Army (IJA) adopted several different types of infantry-level field mortars. In 1939 came about a new design of 81mm caliber designated the "Type 99" (after the Japanese calendar year of "2599"). The Type 99 was a short-tube weapon and classified as a compact "trench mortar" during a time when it was believed that wars would still be fought through "Trench Warfare" as it was in World War 1 (1914-1918).

The Type 99, as a complete weapon system, showcased a weight of 53lb and a length of over two feet. Its launch tube measured just over a foot long. A bipod assembly, hinged to affect elevation, was affixed under the muzzle and a basic rectangular plate was fitted at the tail end of the unit. The baseplate measured over two feet wide.

The Type 99 fired 81mm shells of 7lb weight out to an effective range of 710 yards (650 meters). Absolute range was near 2,200 yards (2,000 meters). The loading system was entirely manual as most weapons of this class were. The integral mounting hardware allowed for an elevation span of +45 to +85 degrees and the projectiles exited the muzzle at 270 feet per second.

Available ammunition types included the standard explosive type, a smoke round (parachute), signal round (green smoke), mine dispenser round and a chemical round. The projectile was a self-contained munition featuring the primer cartridge, propellant charge, percussion fuze and spring-loaded fins for stabilization during the flight path. Projectiles detonated upon impact or - with some operator interference - through delayed action.

Type 99 mortars were in use until the end of the war in 1945.

Content ©MilitaryFactory.com; No Reproduction Permitted.
Physical
The physical qualities of the Type 99 81mm. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
717 mm
28.23 in
O/A Length
552 mm
21.73 in
Barrel Length
55.12 lb
25.00 kg
Weight
manual loading; primer actuated
Action
81mm
Caliber(s)
Single-Shot
Feed
Included Optics
Sights
Performance
Performance specifications presented assume optimal operating conditions for the Type 99 81mm. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
2,135 ft
650.7 m | 711.7 yds
Max.Eff.Range
6
Rounds-Per-Minute
Rate-of-Fire
270 ft/sec
82 m/sec
Muzzle Velocity
Variants
Notable series variants as part of the Type 99 81mm Infantry Field Mortar family line.
Type 99 - Base Series Designation
Operators
Global customers who have evaluated and/or operated the Type 99 81mm. Nations are displayed by flag, each linked to their respective national small arms listing.

Contractor(s): State Factories - Japanese Empire
National flag of modern Japan

[ Imperial Japan ]
1 / 1
Image of the Type 99 81mm
Image from the Public Domain.

Design Qualities
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FIRE SUPPORT
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Type 99 81mm Infantry Field Mortar appears in the following collections:
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