Japanese Type 10 Light Grenade Projector (aka Knee Mortar)

Published on March 24, 2018
Duration: 10:30

This guide details the disassembly of the Japanese Type 10 Light Grenade Projector, as demonstrated by Ian McCollum on Forgotten Weapons. The process involves detaching the base plate and unscrewing the stock for compact storage, highlighting the weapon's portability. The video emphasizes its historical context as an early infantry support weapon largely replaced by the Type 89.

Quick Summary

The Japanese Type 10 Light Grenade Projector, known as the 'knee mortar,' was developed in 1921 to extend infantry's explosive projection range. Weighing 5.5 lbs, it offered effective ranges from 60-250 meters. Its disassembly is compact, and contrary to myth, its curved base was for ground bracing, not thigh support.

Chapters

  1. 00:00Introduction to the Type 10
  2. 00:42Historical Context and Development
  3. 01:50Basic Specifications
  4. 02:20Disassembly and Assembly
  5. 03:29Range Adjustment Mechanism
  6. 05:20Aiming and Firing
  7. 07:07The 'Knee Mortar' Myth
  8. 08:18Production and Successors

Frequently Asked Questions

What was the primary purpose of the Japanese Type 10 Light Grenade Projector?

The Type 10 Light Grenade Projector was designed to replace rifle grenades, providing infantry with a means to project explosives further than hand grenades but closer than crew-served mortars. It was introduced in 1921.

How is the range adjusted on the Type 10 Light Grenade Projector?

Range is adjusted using a large vent hole at the bottom of the firing chamber. Rotating a collar opens or closes this vent, altering the gas pressure acting on the grenade. It features dual range scales for different projectile types.

What is the 'knee mortar' myth regarding the Type 10?

A common myth is that the curved base plate of the Type 10 was designed to be braced against the thigh. In reality, this would cause injury; the curve was intended to allow bracing against various ground surfaces, logs, or rocks.

When was the Type 10 Light Grenade Projector produced and what succeeded it?

Production began in 1923, with approximately 11,000 units made. It was superseded by the rifled Type 89 Grenade Projector in 1929, after which the Type 10 was mainly used for signaling.

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