Tenryu Class CL

[el cid again]

Both stock and RHS (and probably many other mods which use a stock
foundation) have incorrect armament data for the start of war Tenryu class
cruisers.

These are the oldest and smallest of CLs in IJN service. An unsuccessful
design intended as destroyer leaders, they were always too slow for that
role, and 6 of the 8 planned were canceled in favor of a larger design based
on it. There also was serious design work in 1935-6 to turn them into CLAAs,
for which they were well suited. For that reason, both the 1939 armament
(still mounted in 1941) and this alternate are described here.

Ships as they should start the game:

The main armament is correct - 4 single 5.5 inch SP guns.

The major omission is a 3 inch/40 caliber AA gun right aft of the after
5.5 inch mounting.

The minor omission is a pair of 13.2 mm AAMG mounted on the quarterdeck,
behind the 3 inch AA gun. [Originally these were not present. A single
6.5 mm AAMG was mounted port and starboard. These might still have
been on board in 1941, but are not listed. The 13.2s were added in the 1939
refit.]

AA Conversion - never implemented.

All four 5.5 inch mountings were replaced with twin 5 inch/40 caliber AA guns.
This was somewhat modified, however, such that instead of 1 forward, 2 centerline
and 1 aft it became 1 forward, 1 centerline and 2 aft (superimposed). The 3 inch
AA gun was removed. So were the AAMG. In their place were 4 twin 25 mm.
Also, the design contemplated 36 DC in patterns of 4 = 9 shots.

[bartrat]

Where did you get the above data? what source(s)?

[JeffroK]

Who cares about the source, my search brings up the same (except it says a 3.1" gun)and confirms the 12.7mm MG's

[el cid again]

I use multiple sources. The most definitive is Japanese Cruisers of the Pacific War,
a massive work half a century in the making by a Dutch doctor and a senior US official.
I also use Warships of the Imperial Japanese Navy and Cruisers of the Pacific War.
Primarily I do line drawing and photographic analysis.

Although the data I originally reported remain correct for 1939, I found a line drawing
of a 1940 refit. This indicates the 3 inch gun and the AAMG were both replaced by
twin 25 mm. It also indicates the mine fit was 34 vice 24 - probably 17 shots of 2.

I also found a line drawing of the 1936 CLAA design. This indicates the original mounting
pattern was retained = 2 forward, 4 centerline (in pairs), 2 aft. A note says that a 1939
variation substituted the new 3 inch Type 98 guns for the 5 inch/40 cal AA guns on the
same pattern. It was dropped in favor of the new AA destroyer design using 4 inch Type 98
guns.

[JeffroK]

My info doesnt mention the 1940 refit and implies that the '39 refit was the last.

PS I can find reference to the 12.7mm being replaced by 25mm but the 3.1" ( 8 cm/40 3rd Year Type naval gun) remains.