In 1930s,Japan had already equipped Type 90 incendiary shell for their 75mm gun, such as Type 95, Type 90 ,Type 38(improved) and Type 41cavalry gun.
According to this document from 1934, this type of shell is interchangeable.
https://www.jacar.archives.go.jp/das/image/C01004339100#1
Type 90 incendiary shell(九〇式焼夷弾)
However, even with the most compact Type 41 cavalry gun is still bigger than the Type 1 47mm gun.
Type 41 cavalry gun
So, here we have another solution, the 120mm short naval gun, this gun was originally used by merchant ships to defend against attacks from enemy planes or submarines. According to this document It could also fire incendiary shell and incendiary shrapnel shell like the famous San-shiki-dan.
The 120mm short naval gun
It has pretty good elevation and it could fire 10 rounds per minute. The biggest advantage is that it’s has 360 degree rotation.
Unfortunately, this is the only picture I found. Most of them are the 200mm version, which is pretty similar, except for the size, the recoil mechanism doesn’t protrude significantly beyond the gun mount and lack of a large protrusion at the pedestal base.
200mm short naval gun
Here’s the full comparison from this report, it’s on page 12.
https://www.researchgate.net/publication/317416178_The_Japanese_short-barrelled_12cm_and_20cm_dual_purpose_naval_guns_Their_technical_details_war-time_distribution_and_surviving_examples#read
Even though both of them are not as compact as Ampulomet or Northover Projector, it would still be an interesting choice for Japanese flamethrower squad.
The 120mm has more flexibility, Type 41 cavalry gun has good protection.
Do you want to see them in the future?
- Yes
- No
Which one do you prefer
- Type 41 75mm cavalry gun(incendiary shell)
- 120mm naval short gun( incendiary/incendiary shrapnel shell)