The IJN proposed to modify the overage light cruisers Tenryu and Tatsuta into anti-aircraft cruisers in 1935-36 much like the RN had modified some of the C-class cruisers.
1.) The new armament was to include 4 x 2 type 89 12.7 cm HA mounts (unshielded A1 model). the centerline locations of the new armament would coincide roughly with the position of the former 14 cm mounts.
2.) 4 x 3 type 96 25mm mounts around the funnel.
3.) 2 x type 94 HA fire control installations.
4.) Depth charge racks
5.) 100 cm searchlight on the centerline aft of the funnel.
Also the torpedo mounts would be removed and all the boilers converted to oil burning.
However, the plan was not carried out due to the heavy burden on the shipyards.
Another plan (one source says it was simplified) was put forth in 1938-9 to rearm the Tenryu class with the new 60 cal Type 98 8cm HA guns (used on Agano class as secondary and heavy AA armament). This plan was dropped in favor of the Akizuki AA destroyers.
Source: Japanese Cruisers of the Pacific War by E. Lacroix and L. Wells III
Drawing on pg. 162 of proposed conversion
Model used: Navis Tatsuta S-58
Twin type 89 12.7 cm HA mounts: Spare parts from Waterline Ships.com
Splash shield around forward twin 12.7 cm mount is from 1/700 IJN equipment kit to be used for triple 25mm AA mounts
HA AA directors: Waterline Ships.com
Exhaust Stack: spares box
Searchlight: removed from original model and put in new position
Triple 25mm mounts : scratch built
Pic of the modified cruiser
Pic with the another Navis S-58
Pic with S-58 and newer Navis 256 model. (note the change in the bridge structure and lack of 80cm single AA mount in the newer casting)
pic with the WW2 versions of the Tatsuta.
The ones behind the Navis 256 are Neptun 1247, Konishi 403 (Tenryu), and a Superior Tenryu class cl.
I used the Navis S-58 vs. the 256 casting due to the simplified bridge structure. Surprisingly the used Navis casting were relatively cheap. The cost running between $10 -20.
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