Design
The trail was the split-box type trail with detachable spades. The traversing hand wheel and the scale were located on the left side of the carriage. The elevation scale, the range drum, and the sight were on the right side of the carriage.
It fires a shell considerably heavier than that used in the 150-mm howitzer. The Japanese were sufficiently satisfied with this gun to provide it with a fixed mount for siege use in 1930, but as a heavy field piece it has certain definite limitations. Traveling in two loads, it takes longer to emplace than weapons of corresponding caliber in other modern armies and yet it is out-ranged by all of them.
The Type 89 has a variable hydro-pneumatic recoil system and an interrupted thread breech block; the latter has a mushroom head and stepped-up buttress type screws. Two carriages have been recovered. The only apparent difference is in the two equilibrators. One has spring type and the other hydrospring type. The trail is the split box type with detachable trail spades. The traversing handwheel and scale are located on the left side of the carriage; the scale is graduated up to 350 mils in ten mil increments. The elevation scale, range drum, and sight are on the right side of the carriage; the range scale is graduated up to 42 degrees.
An 8 ton prime mover is used to tow the piece. For traveling, the gun is broken down in two loads, tube and carriage.
Read more about this topic: Type 89 15 Cm Cannon
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