Type 10 grenade discharger

• Name — Type 10 grenade discharger • Origin — Empire of Japan • Type — Light mortar • Is Ranged — yes • Is Artillery — yes • Service — 1921–1945 • Wars — Second Sino-Japanese War, World War II, Indonesian National Revolution, Malayan Emergency, Korean War • Design Date — 1918–1920 • Production Date — 1921–1937 • Weight — 2.6 kg • Length — 525 mm (20.7 in) • Part Length — 240 mm (9.5 in) • Cartridge Weight —.53 kg • Caliber — 50 mm (1.97 in) • Range — (Type 91 grenade): 65 m (71 yd) • Max Range — (Type 91 grenade): 175 m (191 yd)

The Type 10 first entered service with the Imperial Japanese Army (IJA) in 1921. It was initially used to launch high-explosive (HE) Type 10 grenades alongside pyrotechnic grenades; in 1931 the munition was replaced by the Type 91 grenade. While it proved to be useful, the Type 10 had the drawback of having a loose fit between the grenade and barrel, which caused gas to leak out and subsequently reducing effective range. Another issue was the poor aerodynamic shape of the Type 10 grenade, which also affected range and accuracy. These issues were fixed on the Type 89 grenade discharger, which fired a special HE shell with copper driving band through the rifled barrel with a greater range and could still fire standard HE hand grenades at shorter distances if necessary. Shortly after the Marco Polo Bridge incident, the Nationalist government ordered the Hanyang Arsenal to reverse-engineer the Type 10. They initially made a close copy, but the design proved to be too complicated to manufacture and for soldiers to operate it. At the same time production was moved to the 30th Arsenal, where the design was simplified and approved for service in 1938 as the Type 27 grenade launcher. According to Ness and Shih, the Chinese produced a total of 40,909 launchers and 1,551,313 grenades during the war. Captured Type 27s were primarily issued to the IJA non-combat units, such as transport and engineer units in China, though a few were taken with them as they were transferred to the Pacific islands and encountered in small numbers by the United States forces.

The Type 10 has a range of 175 m, greater than other grenade dischargers of that time. It had a range control device at the base of the barrel in the form of a graduated thimble by which a gas port at the base of the tube could be varied in size. For shorter ranges, part of the propellant gases escape to the side. The manual for the mortar instructed the troops to carry the mortar on the upper thigh, with the base plate attached to the belt and the barrel running down the thigh. It was not strapped or secured directly to the thigh. It was also carried strapped to the backpack.

A Chinese copy produced by the 30th Arsenal in 1939–1945, it was simplified to ease manufacturing (production time was one-third of the Type 10) and allow the use of lower-quality metal. It was slightly heavier than the original but it was liked by troops. Ammunition was interchangeable with the Type 10, and both Japanese and Chinese forces frequently used captured weapons and ammunition during the war.

• Type 10 grenade − High-explosive shell, it was replaced in 1931 by the Type 91 • Type 91 grenade − HE shell • Type 10 shell − Flare and signal shell • Type 11 shell − Smoke shell • Illustration — A Type 91 grenade. • Illustration — A Type 10 grenade discharger

Due to a translation error, the Type 10 was called the "knee mortar" by the Americans. American troops on Guadalcanal became aware of the name "knee mortar" and thought the light design allowed it to be fired with the base plate resting on the thigh. If the Type 10 were fired in this manner, it would result in serious injury due to recoil.

• Empire of Japan: Imperial Japanese Army • Republic of China (1912–1949): Captured during the Second Sino-Japanese War. Produced locally as the Type 27 grenade launcher

Bilder-Hefte zur Geschichte des Bücherhandels und der mit demselben verwandten Künste und Gewerbe / herausgegeben von Heinrich Lempertz. Tables de concordance des ères chrétienne et hégirienne / H.G. Type 10 grenade discharger is classified as a grenade launcher. Associated with Empire of Japan. Within the Encyclopedia. Connected to 1 other published record in the VALÉORINE Encyclopedia.