Type 5 Ho-Ri Projects

Requirement and development

Ho-Ri belongs to the late-war attempt to obtain a larger direct-fire weapon from a heavier Japanese tracked platform. Its association with Chi-Ri is important, but it is not evidence that a complete Ho-Ri inherited a proven series-production chassis. Chi-Ri itself had not become an operational production tank. ^{1, 2}

Layout and engineering

Published secondary descriptions distinguish a rear fighting-compartment concept from a more central arrangement. Their placement changes the space available for crew, ammunition and machinery, so a drawing can be useful in explaining the designers’ layout problem. It is not a photograph of a completed vehicle. Ho-Ri I and Ho-Ri II should therefore remain labels for proposed arrangements unless fabrication records establish more. Dimensions or armor values drawn from different reconstructions should not be combined into one apparently definitive prototype. ¹

Armament and direct-fire role

The official NIDS catalog lists record Central–Military Administration Weapons–619 as a Ho-Ri gun completion-test plan and related material dated October 1944. The same catalog page lists 630, an August 1943 design register for an experimental long 10 cm tank gun from the First Army Technical Research Institute. The second title does not itself name Ho-Ri. These are catalog descriptions, not the underlying files, and a test plan does not prove completed tests. Neither entry establishes that a complete Ho-Ri vehicle was manufactured, accepted or fielded. ³

Protection and survivability

An armor drawing describes an intention. Without a securely established completed vehicle and test record, it does not demonstrate resistance to a particular weapon. For that reason, the profile does not offer a definitive protection table assembled from speculative reconstructions or comparisons with visually similar foreign vehicles. ¹

Mobility, reliability, and logistics

The Chi-Ri relationship describes an intended starting point, not a measured Ho-Ri performance record. A heavier gun installation would require assessment of load distribution, drivetrain capacity, cooling and access for maintenance. Those are consequences of the proposed engineering arrangement, not results of trials known to have occurred. A Chi-Ri engine figure cannot become a Ho-Ri road-speed or range specification simply by assuming that the proposed vehicle was completed at the predicted weight. ^{1, 2}

Variants, production, and naming

Ho-Ri I and Ho-Ri II are labels used in secondary descriptions of proposed arrangements. They are not treated here as accepted factory model designations established by the catalog titles. A production-planning entry records an intention; it cannot supply a manufactured total without corresponding completion and acceptance evidence. The unresolved naming and production questions remain separate from the cataloged gun paperwork. ¹

Operational service

No established combat episode can be assigned to the Ho-Ri. Preparation for a possible defense of Japan provides context for late-war development, but it does not turn the project into a participant in the final campaigns. The surviving Chi-Ri prototype is a different vehicle and cannot fill that gap. ^{1, 2}

Limitations and tradeoffs

The evidence has several different levels. The NIDS catalog establishes that named records are held; the underlying file would be needed to determine exactly what was planned, measured or completed. Secondary descriptions and drawings help explain proposed layouts but are not equivalent to factory acceptance records. Even a successful gun test would demonstrate only part of the complete vehicle. Keeping these levels separate allows the project to be described without replacing gaps in the record with a fictional service history. ¹

Historical place

Ho-Ri documents a proposed route toward heavier Japanese direct-fire capability, not an established production vehicle. Its place in the record rests on the distinction between a gun-development program, proposed vehicle arrangements and evidence of completed manufacture. A short, carefully bounded account is more defensible than a detailed specification assembled from unrelated drawings or a fictional combat history. ¹

Sources and further reading

References and further reading are listed below. Image identification, credit and reuse terms remain with each photograph.

1. “Type 5 Chi-Ri medium tank,” variants discussion and cited Ho-Ri bibliography
2. John Rickard, “Type 5 Chi-Ri Medium Tank” (2008)
3. NIDS Military Archives, Army technical-material catalog, PDF page 243, entries 619 and 630 (catalog metadata, not the underlying archival files)

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