Type 89 Knee Mortar

Published on September 23, 2015
Duration: 12:16

This guide details the operational technique for the Type 89 Knee Mortar, emphasizing its unique rifled bore and adjustable firing pin for range. It highlights the importance of proper bracing and the 45-degree firing angle, correcting the common misconception about its name. The information is presented with high authority, drawing on deep historical and technical knowledge.

Quick Summary

The Type 89 Knee Mortar, officially the Type 89 Heavy Grenade Discharger, was a 50mm rifled mortar used by the Imperial Japanese Army. Despite its name, it was braced against the ground, not the knee, due to significant recoil. It featured adjustable range via its firing pin assembly, reaching up to 650 meters with its dedicated shell.

Chapters

  1. 00:00Introduction and Historical Context
  2. 01:00Classification and Tactical Use
  3. 02:30The 'Knee Mortar' Misconception
  4. 03:55Technical Features and Rifling
  5. 05:50Range Adjustment and Projectiles
  6. 07:20Aiming and Leveling
  7. 08:05Comparison and Projectile Design
  8. 09:50Firing Positions and Direct Fire
  9. 11:35Legal Classification and Auction

Frequently Asked Questions

What is the Type 89 Knee Mortar and how was it used?

The Type 89 Knee Mortar, officially the Type 89 Heavy Grenade Discharger, was a 50mm rifled mortar used by the Imperial Japanese Army. It provided light, indirect fire support to suppress enemy positions and facilitate troop maneuvers during World War II.

Why is it called a 'Knee Mortar' if it wasn't fired from the knee?

The name 'Knee Mortar' is an American misnomer. While it has a curved baseplate, it was designed to be braced against the ground or a log. Firing it from the knee would cause severe injury due to its significant recoil.

How is the range adjusted on the Type 89 Knee Mortar?

Range is adjusted by modifying the volume of the combustion chamber using an internal firing pin assembly. This system allows for two distinct range scales, up to 650 meters for its dedicated 50mm shell.

What makes the Type 89 Knee Mortar unique compared to other mortars?

Its unique features include a rifled bore for increased accuracy, a lighter weight (approx. 10 lbs) for faster deployment than comparable mortars like the US 60mm, and an adjustable firing pin mechanism for range control.

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