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The Type 91 Grenade was primarily used in the jungle where there was a significant chance that any mortar round would hit something on its way to the target. This is where the seven to eight second delay came into action. The firing pin was also adjustable so the range could be set; the higher the firing pin was set, the lesser the distance the shell would go.
There were no sights for aiming, only a line on the barrel and the maximum range was about 670 metres. Due to bad translation American's thoght the weapons was called the "Knee Mortar". Many soldiers lost and hurt their legs because of this but in reality it was meant to be fired resting the ground or another solid object. The spade-type support at the back of the Type 89 was meant to be angled at about forty-five degrees and sometimes it could be positioned pointing straight against a tree.
Firing from the knee would cause several injuries including broken bones. The empty weight of the mortar was 4.7 kilograms and the length was 61 centimetres. The Type 89 was also capable of being disassembled into three main components and being reassembled at the desired location. There were no variants of the Type 89 and it was made as better version of the earlier Type 10 Mortar.
The Type 89 Light Mortar was developed in 1929, and it was used in many different places, such as in the Pacific Theater. Some of these include China, Burma, and some other Pacific islands. It had a certain psychological effect on Allied troops and some learned to recognize the Type 89 Mortar by its "pop" sound when firing. The effectiveness was mixed, but overall it was fairly good.
- ↑ 1,0 1,1 http://www.militaryfactory.com/smallarms/detail.asp?smallarms_id=299
- ↑ http://members.shaw.ca/nambuworld/t89pix.htm