Tzoli

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I've founds this interesting design on the Shipbucket forums and I've thought I share it here as well.

During the Fourth Defense Force Development Plan (years 1972 – 1976), the Japan Maritime Self-Defense Force (JMSDF) planned to introduce a successor to the Yamagumo – class destroyers. This new class was to be based on the preceding Yamagumo – class, however it would feature increased displacement and the introduction of several technologies which were new to the JMSDF, such as gas turbines and a point-defense missile system.

Originally, three vessels were planned to be built from 1974 to 1976, however, due to the oil shocks arising from the 1973 Yom Kippur war and the OPEC embargo that followed, it became impossible for the Japan Defense Agency to fund the project. Ultimately, a sixth Yamagumo – class vessel would be built instead using the same intended hull number (DD-121 Yūgumo) as the first of the 2500-ton class.

It was not all in vain however, as many of the innovations that arose during the development of this type were subsequently introduced on the Hatsuyuki – class destroyers and Ishikari – class destroyer escort during the next Defense Force Development Plan. Both types were equipped with Olympus TM3B gas turbine engine that was planned to be adopted on the 2500-ton type. Thus, the 2500-ton type can be seen as a developmental “bridge” between the Yamagumo and Hatsuyuki – class destroyers even though they were never introduced into service.

Wikipedia article:
https://ja.wikipedia.org/wiki/2500トン型護衛艦

Official drawing:
1691911602111.png
Artist impressions:
1691911616696.png
1691911626480.png

Shipbucket drawing:
1691911660682.png
Notes on the drawing:

I have included several speculative details based on other JMSDF vessels of the period – namely the Sea Sparrow BPDMS. Because the indigenous FCS-2 fire control system was delayed entering in service, the Shirane – class DDHs were first equipped with the Signaal WM-25 when they were constructed in the late 70s. I would expect the US-surplus Mk 25 GMLS and the WM-25 to be replaced with Mk 29 and FCS-2-12 in a subsequent refit.

Additionally, I am uncertain about the potential interference between the WM-25 and ESM systems located on the aft mast. The references seem to indicate the position of the notional Sea Sparrow fire control system atop the mast; however, this is also where ESM antennas were normally located on Yamagumo and Minegumo – class destroyers. This would likely not be an optimal setup, however in the spirit of not making my own changes to the references, I have left their position as-is.

Thanks for reading, I appreciate any and all feedback – I’ve also included my references below.
 
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